feat: add ChangeColumnType expr (#149)

* feat: add `ModifyColumn`

* style: rename `ModifyColumn` -> `ChangeColumnType`

* style: rename `modify_columns` -> `change_column_types`

* style: remove `ChangeColumnTypes` on `server.proto`

* resolve conflicts

c++/greptime/v1/ddl.pb.cc

@@ -235,6 +235,19 @@ struct DropColumnsDefaultTypeInternal {
   };
 };
 PROTOBUF_ATTRIBUTE_NO_DESTROY PROTOBUF_CONSTINIT PROTOBUF_ATTRIBUTE_INIT_PRIORITY1 DropColumnsDefaultTypeInternal _DropColumns_default_instance_;
+PROTOBUF_CONSTEXPR ChangeColumnTypes::ChangeColumnTypes(
+    ::_pbi::ConstantInitialized): _impl_{
+    /*decltype(_impl_.change_column_types_)*/{}
+  , /*decltype(_impl_._cached_size_)*/{}} {}
+struct ChangeColumnTypesDefaultTypeInternal {
+  PROTOBUF_CONSTEXPR ChangeColumnTypesDefaultTypeInternal()
+      : _instance(::_pbi::ConstantInitialized{}) {}
+  ~ChangeColumnTypesDefaultTypeInternal() {}
+  union {
+    ChangeColumnTypes _instance;
+  };
+};
+PROTOBUF_ATTRIBUTE_NO_DESTROY PROTOBUF_CONSTINIT PROTOBUF_ATTRIBUTE_INIT_PRIORITY1 ChangeColumnTypesDefaultTypeInternal _ChangeColumnTypes_default_instance_;
 PROTOBUF_CONSTEXPR RenameTable::RenameTable(
     ::_pbi::ConstantInitialized): _impl_{
     /*decltype(_impl_.new_table_name_)*/{&::_pbi::fixed_address_empty_string, ::_pbi::ConstantInitialized{}}
@@ -262,6 +275,21 @@ struct AddColumnDefaultTypeInternal {
   };
 };
 PROTOBUF_ATTRIBUTE_NO_DESTROY PROTOBUF_CONSTINIT PROTOBUF_ATTRIBUTE_INIT_PRIORITY1 AddColumnDefaultTypeInternal _AddColumn_default_instance_;
+PROTOBUF_CONSTEXPR ChangeColumnType::ChangeColumnType(
+    ::_pbi::ConstantInitialized): _impl_{
+    /*decltype(_impl_.column_name_)*/{&::_pbi::fixed_address_empty_string, ::_pbi::ConstantInitialized{}}
+  , /*decltype(_impl_.target_type_extension_)*/nullptr
+  , /*decltype(_impl_.target_type_)*/0
+  , /*decltype(_impl_._cached_size_)*/{}} {}
+struct ChangeColumnTypeDefaultTypeInternal {
+  PROTOBUF_CONSTEXPR ChangeColumnTypeDefaultTypeInternal()
+      : _instance(::_pbi::ConstantInitialized{}) {}
+  ~ChangeColumnTypeDefaultTypeInternal() {}
+  union {
+    ChangeColumnType _instance;
+  };
+};
+PROTOBUF_ATTRIBUTE_NO_DESTROY PROTOBUF_CONSTINIT PROTOBUF_ATTRIBUTE_INIT_PRIORITY1 ChangeColumnTypeDefaultTypeInternal _ChangeColumnType_default_instance_;
 PROTOBUF_CONSTEXPR DropColumn::DropColumn(
     ::_pbi::ConstantInitialized): _impl_{
     /*decltype(_impl_.name_)*/{&::_pbi::fixed_address_empty_string, ::_pbi::ConstantInitialized{}}
@@ -323,7 +351,7 @@ struct AddColumnLocationDefaultTypeInternal {
 PROTOBUF_ATTRIBUTE_NO_DESTROY PROTOBUF_CONSTINIT PROTOBUF_ATTRIBUTE_INIT_PRIORITY1 AddColumnLocationDefaultTypeInternal _AddColumnLocation_default_instance_;
 }  // namespace v1
 }  // namespace greptime
-static ::_pb::Metadata file_level_metadata_greptime_2fv1_2fddl_2eproto[20];
+static ::_pb::Metadata file_level_metadata_greptime_2fv1_2fddl_2eproto[22];
 static const ::_pb::EnumDescriptor* file_level_enum_descriptors_greptime_2fv1_2fddl_2eproto[1];
 static constexpr ::_pb::ServiceDescriptor const** file_level_service_descriptors_greptime_2fv1_2fddl_2eproto = nullptr;
 
@@ -415,6 +443,7 @@ const uint32_t TableStruct_greptime_2fv1_2fddl_2eproto::offsets[] PROTOBUF_SECTI
   ::_pbi::kInvalidFieldOffsetTag,
   ::_pbi::kInvalidFieldOffsetTag,
   ::_pbi::kInvalidFieldOffsetTag,
+  ::_pbi::kInvalidFieldOffsetTag,
   PROTOBUF_FIELD_OFFSET(::greptime::v1::AlterExpr, _impl_.kind_),
   ~0u,  // no _has_bits_
   PROTOBUF_FIELD_OFFSET(::greptime::v1::DropTableExpr, _internal_metadata_),
@@ -481,6 +510,13 @@ const uint32_t TableStruct_greptime_2fv1_2fddl_2eproto::offsets[] PROTOBUF_SECTI
   ~0u,  // no _inlined_string_donated_
   PROTOBUF_FIELD_OFFSET(::greptime::v1::DropColumns, _impl_.drop_columns_),
   ~0u,  // no _has_bits_
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::ChangeColumnTypes, _internal_metadata_),
+  ~0u,  // no _extensions_
+  ~0u,  // no _oneof_case_
+  ~0u,  // no _weak_field_map_
+  ~0u,  // no _inlined_string_donated_
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::ChangeColumnTypes, _impl_.change_column_types_),
+  ~0u,  // no _has_bits_
   PROTOBUF_FIELD_OFFSET(::greptime::v1::RenameTable, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
@@ -496,6 +532,15 @@ const uint32_t TableStruct_greptime_2fv1_2fddl_2eproto::offsets[] PROTOBUF_SECTI
   PROTOBUF_FIELD_OFFSET(::greptime::v1::AddColumn, _impl_.column_def_),
   PROTOBUF_FIELD_OFFSET(::greptime::v1::AddColumn, _impl_.location_),
   ~0u,  // no _has_bits_
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::ChangeColumnType, _internal_metadata_),
+  ~0u,  // no _extensions_
+  ~0u,  // no _oneof_case_
+  ~0u,  // no _weak_field_map_
+  ~0u,  // no _inlined_string_donated_
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::ChangeColumnType, _impl_.column_name_),
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::ChangeColumnType, _impl_.target_type_),
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::ChangeColumnType, _impl_.target_type_extension_),
+  ~0u,  // no _has_bits_
   PROTOBUF_FIELD_OFFSET(::greptime::v1::DropColumn, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
@@ -539,19 +584,21 @@ static const ::_pbi::MigrationSchema schemas[] PROTOBUF_SECTION_VARIABLE(protode
   { 48, 56, -1, sizeof(::greptime::v1::CreateTableExpr_TableOptionsEntry_DoNotUse)},
   { 58, -1, -1, sizeof(::greptime::v1::CreateTableExpr)},
   { 75, -1, -1, sizeof(::greptime::v1::AlterExpr)},
-  { 88, -1, -1, sizeof(::greptime::v1::DropTableExpr)},
+  { 89, -1, -1, sizeof(::greptime::v1::DropTableExpr)},
-  { 99, 107, -1, sizeof(::greptime::v1::CreateDatabaseExpr_OptionsEntry_DoNotUse)},
+  { 100, 108, -1, sizeof(::greptime::v1::CreateDatabaseExpr_OptionsEntry_DoNotUse)},
-  { 109, -1, -1, sizeof(::greptime::v1::CreateDatabaseExpr)},
+  { 110, -1, -1, sizeof(::greptime::v1::CreateDatabaseExpr)},
-  { 119, -1, -1, sizeof(::greptime::v1::TruncateTableExpr)},
+  { 120, -1, -1, sizeof(::greptime::v1::TruncateTableExpr)},
-  { 129, -1, -1, sizeof(::greptime::v1::DropDatabaseExpr)},
+  { 130, -1, -1, sizeof(::greptime::v1::DropDatabaseExpr)},
-  { 138, -1, -1, sizeof(::greptime::v1::AddColumns)},
+  { 139, -1, -1, sizeof(::greptime::v1::AddColumns)},
-  { 145, -1, -1, sizeof(::greptime::v1::DropColumns)},
+  { 146, -1, -1, sizeof(::greptime::v1::DropColumns)},
-  { 152, -1, -1, sizeof(::greptime::v1::RenameTable)},
+  { 153, -1, -1, sizeof(::greptime::v1::ChangeColumnTypes)},
-  { 159, -1, -1, sizeof(::greptime::v1::AddColumn)},
+  { 160, -1, -1, sizeof(::greptime::v1::RenameTable)},
-  { 167, -1, -1, sizeof(::greptime::v1::DropColumn)},
+  { 167, -1, -1, sizeof(::greptime::v1::AddColumn)},
-  { 174, -1, -1, sizeof(::greptime::v1::TableId)},
+  { 175, -1, -1, sizeof(::greptime::v1::ChangeColumnType)},
-  { 181, -1, -1, sizeof(::greptime::v1::ColumnDef)},
+  { 184, -1, -1, sizeof(::greptime::v1::DropColumn)},
-  { 194, -1, -1, sizeof(::greptime::v1::AddColumnLocation)},
+  { 191, -1, -1, sizeof(::greptime::v1::TableId)},
+  { 198, -1, -1, sizeof(::greptime::v1::ColumnDef)},
+  { 211, -1, -1, sizeof(::greptime::v1::AddColumnLocation)},
 };
 
 static const ::_pb::Message* const file_default_instances[] = {
@@ -569,8 +616,10 @@ static const ::_pb::Message* const file_default_instances[] = {
   &::greptime::v1::_DropDatabaseExpr_default_instance_._instance,
   &::greptime::v1::_AddColumns_default_instance_._instance,
   &::greptime::v1::_DropColumns_default_instance_._instance,
+  &::greptime::v1::_ChangeColumnTypes_default_instance_._instance,
   &::greptime::v1::_RenameTable_default_instance_._instance,
   &::greptime::v1::_AddColumn_default_instance_._instance,
+  &::greptime::v1::_ChangeColumnType_default_instance_._instance,
   &::greptime::v1::_DropColumn_default_instance_._instance,
   &::greptime::v1::_TableId_default_instance_._instance,
   &::greptime::v1::_ColumnDef_default_instance_._instance,
@@ -610,57 +659,64 @@ const char descriptor_table_protodef_greptime_2fv1_2fddl_2eproto[] PROTOBUF_SECT
   "ptime.v1.CreateTableExpr.TableOptionsEnt"
   "ry\022&\n\010table_id\030\n \001(\0132\024.greptime.v1.Table"
   "Id\022\016\n\006engine\030\014 \001(\t\0323\n\021TableOptionsEntry\022"
-  "\013\n\003key\030\001 \001(\t\022\r\n\005value\030\002 \001(\t:\0028\001\"\346\001\n\tAlte"
+  "\013\n\003key\030\001 \001(\t\022\r\n\005value\030\002 \001(\t:\0028\001\"\245\002\n\tAlte"
   "rExpr\022\024\n\014catalog_name\030\001 \001(\t\022\023\n\013schema_na"
   "me\030\002 \001(\t\022\022\n\ntable_name\030\003 \001(\t\022.\n\013add_colu"
   "mns\030\004 \001(\0132\027.greptime.v1.AddColumnsH\000\0220\n\014"
   "drop_columns\030\005 \001(\0132\030.greptime.v1.DropCol"
   "umnsH\000\0220\n\014rename_table\030\006 \001(\0132\030.greptime."
-  "v1.RenameTableH\000B\006\n\004kind\"\216\001\n\rDropTableEx"
+  "v1.RenameTableH\000\022=\n\023change_column_types\030"
-  "pr\022\024\n\014catalog_name\030\001 \001(\t\022\023\n\013schema_name\030"
+  "\007 \001(\0132\036.greptime.v1.ChangeColumnTypesH\000B"
-  "\002 \001(\t\022\022\n\ntable_name\030\003 \001(\t\022&\n\010table_id\030\004 "
+  "\006\n\004kind\"\216\001\n\rDropTableExpr\022\024\n\014catalog_nam"
-  "\001(\0132\024.greptime.v1.TableId\022\026\n\016drop_if_exi"
+  "e\030\001 \001(\t\022\023\n\013schema_name\030\002 \001(\t\022\022\n\ntable_na"
-  "sts\030\005 \001(\010\"\314\001\n\022CreateDatabaseExpr\022\024\n\014cata"
+  "me\030\003 \001(\t\022&\n\010table_id\030\004 \001(\0132\024.greptime.v1"
-  "log_name\030\001 \001(\t\022\023\n\013schema_name\030\002 \001(\t\022\034\n\024c"
+  ".TableId\022\026\n\016drop_if_exists\030\005 \001(\010\"\314\001\n\022Cre"
-  "reate_if_not_exists\030\003 \001(\010\022=\n\007options\030\004 \003"
+  "ateDatabaseExpr\022\024\n\014catalog_name\030\001 \001(\t\022\023\n"
-  "(\0132,.greptime.v1.CreateDatabaseExpr.Opti"
+  "\013schema_name\030\002 \001(\t\022\034\n\024create_if_not_exis"
-  "onsEntry\032.\n\014OptionsEntry\022\013\n\003key\030\001 \001(\t\022\r\n"
+  "ts\030\003 \001(\010\022=\n\007options\030\004 \003(\0132,.greptime.v1."
-  "\005value\030\002 \001(\t:\0028\001\"z\n\021TruncateTableExpr\022\024\n"
+  "CreateDatabaseExpr.OptionsEntry\032.\n\014Optio"
-  "\014catalog_name\030\001 \001(\t\022\023\n\013schema_name\030\002 \001(\t"
+  "nsEntry\022\013\n\003key\030\001 \001(\t\022\r\n\005value\030\002 \001(\t:\0028\001\""
-  "\022\022\n\ntable_name\030\003 \001(\t\022&\n\010table_id\030\004 \001(\0132\024"
+  "z\n\021TruncateTableExpr\022\024\n\014catalog_name\030\001 \001"
-  ".greptime.v1.TableId\"U\n\020DropDatabaseExpr"
+  "(\t\022\023\n\013schema_name\030\002 \001(\t\022\022\n\ntable_name\030\003 "
-  "\022\024\n\014catalog_name\030\001 \001(\t\022\023\n\013schema_name\030\002 "
+  "\001(\t\022&\n\010table_id\030\004 \001(\0132\024.greptime.v1.Tabl"
-  "\001(\t\022\026\n\016drop_if_exists\030\003 \001(\010\"9\n\nAddColumn"
+  "eId\"U\n\020DropDatabaseExpr\022\024\n\014catalog_name\030"
-  "s\022+\n\013add_columns\030\001 \003(\0132\026.greptime.v1.Add"
+  "\001 \001(\t\022\023\n\013schema_name\030\002 \001(\t\022\026\n\016drop_if_ex"
-  "Column\"<\n\013DropColumns\022-\n\014drop_columns\030\001 "
+  "ists\030\003 \001(\010\"9\n\nAddColumns\022+\n\013add_columns\030"
-  "\003(\0132\027.greptime.v1.DropColumn\"%\n\013RenameTa"
+  "\001 \003(\0132\026.greptime.v1.AddColumn\"<\n\013DropCol"
-  "ble\022\026\n\016new_table_name\030\001 \001(\t\"i\n\tAddColumn"
+  "umns\022-\n\014drop_columns\030\001 \003(\0132\027.greptime.v1"
-  "\022*\n\ncolumn_def\030\001 \001(\0132\026.greptime.v1.Colum"
+  ".DropColumn\"O\n\021ChangeColumnTypes\022:\n\023chan"
-  "nDef\0220\n\010location\030\003 \001(\0132\036.greptime.v1.Add"
+  "ge_column_types\030\001 \003(\0132\035.greptime.v1.Chan"
-  "ColumnLocation\"\032\n\nDropColumn\022\014\n\004name\030\001 \001"
+  "geColumnType\"%\n\013RenameTable\022\026\n\016new_table"
-  "(\t\"\025\n\007TableId\022\n\n\002id\030\001 \001(\r\"\377\001\n\tColumnDef\022"
+  "_name\030\001 \001(\t\"i\n\tAddColumn\022*\n\ncolumn_def\030\001"
-  "\014\n\004name\030\001 \001(\t\022.\n\tdata_type\030\002 \001(\0162\033.grept"
+  " \001(\0132\026.greptime.v1.ColumnDef\0220\n\010location"
-  "ime.v1.ColumnDataType\022\023\n\013is_nullable\030\003 \001"
+  "\030\003 \001(\0132\036.greptime.v1.AddColumnLocation\"\236"
-  "(\010\022\032\n\022default_constraint\030\004 \001(\014\0220\n\rsemant"
+  "\001\n\020ChangeColumnType\022\023\n\013column_name\030\001 \001(\t"
-  "ic_type\030\005 \001(\0162\031.greptime.v1.SemanticType"
+  "\0220\n\013target_type\030\002 \001(\0162\033.greptime.v1.Colu"
-  "\022\017\n\007comment\030\006 \001(\t\022@\n\022datatype_extension\030"
+  "mnDataType\022C\n\025target_type_extension\030\003 \001("
-  "\007 \001(\0132$.greptime.v1.ColumnDataTypeExtens"
+  "\0132$.greptime.v1.ColumnDataTypeExtension\""
-  "ion\"\230\001\n\021AddColumnLocation\022B\n\rlocation_ty"
+  "\032\n\nDropColumn\022\014\n\004name\030\001 \001(\t\"\025\n\007TableId\022\n"
-  "pe\030\001 \001(\0162+.greptime.v1.AddColumnLocation"
+  "\n\002id\030\001 \001(\r\"\377\001\n\tColumnDef\022\014\n\004name\030\001 \001(\t\022."
-  ".LocationType\022\031\n\021after_column_name\030\002 \001(\t"
+  "\n\tdata_type\030\002 \001(\0162\033.greptime.v1.ColumnDa"
-  "\"$\n\014LocationType\022\t\n\005FIRST\020\000\022\t\n\005AFTER\020\001BL"
+  "taType\022\023\n\013is_nullable\030\003 \001(\010\022\032\n\022default_c"
-  "\n\016io.greptime.v1B\003DdlZ5github.com/Grepti"
+  "onstraint\030\004 \001(\014\0220\n\rsemantic_type\030\005 \001(\0162\031"
-  "meTeam/greptime-proto/go/greptime/v1b\006pr"
+  ".greptime.v1.SemanticType\022\017\n\007comment\030\006 \001"
-  "oto3"
+  "(\t\022@\n\022datatype_extension\030\007 \001(\0132$.greptim"
+  "e.v1.ColumnDataTypeExtension\"\230\001\n\021AddColu"
+  "mnLocation\022B\n\rlocation_type\030\001 \001(\0162+.grep"
+  "time.v1.AddColumnLocation.LocationType\022\031"
+  "\n\021after_column_name\030\002 \001(\t\"$\n\014LocationTyp"
+  "e\022\t\n\005FIRST\020\000\022\t\n\005AFTER\020\001BL\n\016io.greptime.v"
+  "1B\003DdlZ5github.com/GreptimeTeam/greptime"
+  "-proto/go/greptime/v1b\006proto3"
   ;
 static const ::_pbi::DescriptorTable* const descriptor_table_greptime_2fv1_2fddl_2eproto_deps[1] = {
   &::descriptor_table_greptime_2fv1_2fcommon_2eproto,
 };
 static ::_pbi::once_flag descriptor_table_greptime_2fv1_2fddl_2eproto_once;
 const ::_pbi::DescriptorTable descriptor_table_greptime_2fv1_2fddl_2eproto = {
-    false, false, 2924, descriptor_table_protodef_greptime_2fv1_2fddl_2eproto,
+    false, false, 3229, descriptor_table_protodef_greptime_2fv1_2fddl_2eproto,
     "greptime/v1/ddl.proto",
-    &descriptor_table_greptime_2fv1_2fddl_2eproto_once, descriptor_table_greptime_2fv1_2fddl_2eproto_deps, 1, 20,
+    &descriptor_table_greptime_2fv1_2fddl_2eproto_once, descriptor_table_greptime_2fv1_2fddl_2eproto_deps, 1, 22,
     schemas, file_default_instances, TableStruct_greptime_2fv1_2fddl_2eproto::offsets,
     file_level_metadata_greptime_2fv1_2fddl_2eproto, file_level_enum_descriptors_greptime_2fv1_2fddl_2eproto,
     file_level_service_descriptors_greptime_2fv1_2fddl_2eproto,
@@ -2860,6 +2916,7 @@ class AlterExpr::_Internal {
   static const ::greptime::v1::AddColumns& add_columns(const AlterExpr* msg);
   static const ::greptime::v1::DropColumns& drop_columns(const AlterExpr* msg);
   static const ::greptime::v1::RenameTable& rename_table(const AlterExpr* msg);
+  static const ::greptime::v1::ChangeColumnTypes& change_column_types(const AlterExpr* msg);
 };
 
 const ::greptime::v1::AddColumns&
@@ -2874,6 +2931,10 @@ const ::greptime::v1::RenameTable&
 AlterExpr::_Internal::rename_table(const AlterExpr* msg) {
   return *msg->_impl_.kind_.rename_table_;
 }
+const ::greptime::v1::ChangeColumnTypes&
+AlterExpr::_Internal::change_column_types(const AlterExpr* msg) {
+  return *msg->_impl_.kind_.change_column_types_;
+}
 void AlterExpr::set_allocated_add_columns(::greptime::v1::AddColumns* add_columns) {
   ::PROTOBUF_NAMESPACE_ID::Arena* message_arena = GetArenaForAllocation();
   clear_kind();
@@ -2919,6 +2980,21 @@ void AlterExpr::set_allocated_rename_table(::greptime::v1::RenameTable* rename_t
   }
   // @@protoc_insertion_point(field_set_allocated:greptime.v1.AlterExpr.rename_table)
 }
+void AlterExpr::set_allocated_change_column_types(::greptime::v1::ChangeColumnTypes* change_column_types) {
+  ::PROTOBUF_NAMESPACE_ID::Arena* message_arena = GetArenaForAllocation();
+  clear_kind();
+  if (change_column_types) {
+    ::PROTOBUF_NAMESPACE_ID::Arena* submessage_arena =
+      ::PROTOBUF_NAMESPACE_ID::Arena::InternalGetOwningArena(change_column_types);
+    if (message_arena != submessage_arena) {
+      change_column_types = ::PROTOBUF_NAMESPACE_ID::internal::GetOwnedMessage(
+          message_arena, change_column_types, submessage_arena);
+    }
+    set_has_change_column_types();
+    _impl_.kind_.change_column_types_ = change_column_types;
+  }
+  // @@protoc_insertion_point(field_set_allocated:greptime.v1.AlterExpr.change_column_types)
+}
 AlterExpr::AlterExpr(::PROTOBUF_NAMESPACE_ID::Arena* arena,
                          bool is_message_owned)
   : ::PROTOBUF_NAMESPACE_ID::Message(arena, is_message_owned) {
@@ -2978,6 +3054,11 @@ AlterExpr::AlterExpr(const AlterExpr& from)
           from._internal_rename_table());
       break;
     }
+    case kChangeColumnTypes: {
+      _this->_internal_mutable_change_column_types()->::greptime::v1::ChangeColumnTypes::MergeFrom(
+          from._internal_change_column_types());
+      break;
+    }
     case KIND_NOT_SET: {
       break;
     }
@@ -3056,6 +3137,12 @@ void AlterExpr::clear_kind() {
       }
       break;
     }
+    case kChangeColumnTypes: {
+      if (GetArenaForAllocation() == nullptr) {
+        delete _impl_.kind_.change_column_types_;
+      }
+      break;
+    }
     case KIND_NOT_SET: {
       break;
     }
@@ -3137,6 +3224,14 @@ const char* AlterExpr::_InternalParse(const char* ptr, ::_pbi::ParseContext* ctx
         } else
           goto handle_unusual;
         continue;
+      // .greptime.v1.ChangeColumnTypes change_column_types = 7;
+      case 7:
+        if (PROTOBUF_PREDICT_TRUE(static_cast<uint8_t>(tag) == 58)) {
+          ptr = ctx->ParseMessage(_internal_mutable_change_column_types(), ptr);
+          CHK_(ptr);
+        } else
+          goto handle_unusual;
+        continue;
       default:
         goto handle_unusual;
     }  // switch
@@ -3217,6 +3312,13 @@ uint8_t* AlterExpr::_InternalSerialize(
         _Internal::rename_table(this).GetCachedSize(), target, stream);
   }
 
+  // .greptime.v1.ChangeColumnTypes change_column_types = 7;
+  if (_internal_has_change_column_types()) {
+    target = ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::
+      InternalWriteMessage(7, _Internal::change_column_types(this),
+        _Internal::change_column_types(this).GetCachedSize(), target, stream);
+  }
+
   if (PROTOBUF_PREDICT_FALSE(_internal_metadata_.have_unknown_fields())) {
     target = ::_pbi::WireFormat::InternalSerializeUnknownFieldsToArray(
         _internal_metadata_.unknown_fields<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>(::PROTOBUF_NAMESPACE_ID::UnknownFieldSet::default_instance), target, stream);
@@ -3276,6 +3378,13 @@ size_t AlterExpr::ByteSizeLong() const {
           *_impl_.kind_.rename_table_);
       break;
     }
+    // .greptime.v1.ChangeColumnTypes change_column_types = 7;
+    case kChangeColumnTypes: {
+      total_size += 1 +
+        ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::MessageSize(
+          *_impl_.kind_.change_column_types_);
+      break;
+    }
     case KIND_NOT_SET: {
       break;
     }
@@ -3323,6 +3432,11 @@ void AlterExpr::MergeImpl(::PROTOBUF_NAMESPACE_ID::Message& to_msg, const ::PROT
           from._internal_rename_table());
       break;
     }
+    case kChangeColumnTypes: {
+      _this->_internal_mutable_change_column_types()->::greptime::v1::ChangeColumnTypes::MergeFrom(
+          from._internal_change_column_types());
+      break;
+    }
     case KIND_NOT_SET: {
       break;
     }
@@ -5103,6 +5217,191 @@ void DropColumns::InternalSwap(DropColumns* other) {
 
 // ===================================================================
 
+class ChangeColumnTypes::_Internal {
+ public:
+};
+
+ChangeColumnTypes::ChangeColumnTypes(::PROTOBUF_NAMESPACE_ID::Arena* arena,
+                         bool is_message_owned)
+  : ::PROTOBUF_NAMESPACE_ID::Message(arena, is_message_owned) {
+  SharedCtor(arena, is_message_owned);
+  // @@protoc_insertion_point(arena_constructor:greptime.v1.ChangeColumnTypes)
+}
+ChangeColumnTypes::ChangeColumnTypes(const ChangeColumnTypes& from)
+  : ::PROTOBUF_NAMESPACE_ID::Message() {
+  ChangeColumnTypes* const _this = this; (void)_this;
+  new (&_impl_) Impl_{
+      decltype(_impl_.change_column_types_){from._impl_.change_column_types_}
+    , /*decltype(_impl_._cached_size_)*/{}};
+
+  _internal_metadata_.MergeFrom<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>(from._internal_metadata_);
+  // @@protoc_insertion_point(copy_constructor:greptime.v1.ChangeColumnTypes)
+}
+
+inline void ChangeColumnTypes::SharedCtor(
+    ::_pb::Arena* arena, bool is_message_owned) {
+  (void)arena;
+  (void)is_message_owned;
+  new (&_impl_) Impl_{
+      decltype(_impl_.change_column_types_){arena}
+    , /*decltype(_impl_._cached_size_)*/{}
+  };
+}
+
+ChangeColumnTypes::~ChangeColumnTypes() {
+  // @@protoc_insertion_point(destructor:greptime.v1.ChangeColumnTypes)
+  if (auto *arena = _internal_metadata_.DeleteReturnArena<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>()) {
+  (void)arena;
+    return;
+  }
+  SharedDtor();
+}
+
+inline void ChangeColumnTypes::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaForAllocation() == nullptr);
+  _impl_.change_column_types_.~RepeatedPtrField();
+}
+
+void ChangeColumnTypes::SetCachedSize(int size) const {
+  _impl_._cached_size_.Set(size);
+}
+
+void ChangeColumnTypes::Clear() {
+// @@protoc_insertion_point(message_clear_start:greptime.v1.ChangeColumnTypes)
+  uint32_t cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
+  _impl_.change_column_types_.Clear();
+  _internal_metadata_.Clear<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>();
+}
+
+const char* ChangeColumnTypes::_InternalParse(const char* ptr, ::_pbi::ParseContext* ctx) {
+#define CHK_(x) if (PROTOBUF_PREDICT_FALSE(!(x))) goto failure
+  while (!ctx->Done(&ptr)) {
+    uint32_t tag;
+    ptr = ::_pbi::ReadTag(ptr, &tag);
+    switch (tag >> 3) {
+      // repeated .greptime.v1.ChangeColumnType change_column_types = 1;
+      case 1:
+        if (PROTOBUF_PREDICT_TRUE(static_cast<uint8_t>(tag) == 10)) {
+          ptr -= 1;
+          do {
+            ptr += 1;
+            ptr = ctx->ParseMessage(_internal_add_change_column_types(), ptr);
+            CHK_(ptr);
+            if (!ctx->DataAvailable(ptr)) break;
+          } while (::PROTOBUF_NAMESPACE_ID::internal::ExpectTag<10>(ptr));
+        } else
+          goto handle_unusual;
+        continue;
+      default:
+        goto handle_unusual;
+    }  // switch
+  handle_unusual:
+    if ((tag == 0) || ((tag & 7) == 4)) {
+      CHK_(ptr);
+      ctx->SetLastTag(tag);
+      goto message_done;
+    }
+    ptr = UnknownFieldParse(
+        tag,
+        _internal_metadata_.mutable_unknown_fields<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>(),
+        ptr, ctx);
+    CHK_(ptr != nullptr);
+  }  // while
+message_done:
+  return ptr;
+failure:
+  ptr = nullptr;
+  goto message_done;
+#undef CHK_
+}
+
+uint8_t* ChangeColumnTypes::_InternalSerialize(
+    uint8_t* target, ::PROTOBUF_NAMESPACE_ID::io::EpsCopyOutputStream* stream) const {
+  // @@protoc_insertion_point(serialize_to_array_start:greptime.v1.ChangeColumnTypes)
+  uint32_t cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  // repeated .greptime.v1.ChangeColumnType change_column_types = 1;
+  for (unsigned i = 0,
+      n = static_cast<unsigned>(this->_internal_change_column_types_size()); i < n; i++) {
+    const auto& repfield = this->_internal_change_column_types(i);
+    target = ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::
+        InternalWriteMessage(1, repfield, repfield.GetCachedSize(), target, stream);
+  }
+
+  if (PROTOBUF_PREDICT_FALSE(_internal_metadata_.have_unknown_fields())) {
+    target = ::_pbi::WireFormat::InternalSerializeUnknownFieldsToArray(
+        _internal_metadata_.unknown_fields<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>(::PROTOBUF_NAMESPACE_ID::UnknownFieldSet::default_instance), target, stream);
+  }
+  // @@protoc_insertion_point(serialize_to_array_end:greptime.v1.ChangeColumnTypes)
+  return target;
+}
+
+size_t ChangeColumnTypes::ByteSizeLong() const {
+// @@protoc_insertion_point(message_byte_size_start:greptime.v1.ChangeColumnTypes)
+  size_t total_size = 0;
+
+  uint32_t cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
+  // repeated .greptime.v1.ChangeColumnType change_column_types = 1;
+  total_size += 1UL * this->_internal_change_column_types_size();
+  for (const auto& msg : this->_impl_.change_column_types_) {
+    total_size +=
+      ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::MessageSize(msg);
+  }
+
+  return MaybeComputeUnknownFieldsSize(total_size, &_impl_._cached_size_);
+}
+
+const ::PROTOBUF_NAMESPACE_ID::Message::ClassData ChangeColumnTypes::_class_data_ = {
+    ::PROTOBUF_NAMESPACE_ID::Message::CopyWithSourceCheck,
+    ChangeColumnTypes::MergeImpl
+};
+const ::PROTOBUF_NAMESPACE_ID::Message::ClassData*ChangeColumnTypes::GetClassData() const { return &_class_data_; }
+
+
+void ChangeColumnTypes::MergeImpl(::PROTOBUF_NAMESPACE_ID::Message& to_msg, const ::PROTOBUF_NAMESPACE_ID::Message& from_msg) {
+  auto* const _this = static_cast<ChangeColumnTypes*>(&to_msg);
+  auto& from = static_cast<const ChangeColumnTypes&>(from_msg);
+  // @@protoc_insertion_point(class_specific_merge_from_start:greptime.v1.ChangeColumnTypes)
+  GOOGLE_DCHECK_NE(&from, _this);
+  uint32_t cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  _this->_impl_.change_column_types_.MergeFrom(from._impl_.change_column_types_);
+  _this->_internal_metadata_.MergeFrom<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>(from._internal_metadata_);
+}
+
+void ChangeColumnTypes::CopyFrom(const ChangeColumnTypes& from) {
+// @@protoc_insertion_point(class_specific_copy_from_start:greptime.v1.ChangeColumnTypes)
+  if (&from == this) return;
+  Clear();
+  MergeFrom(from);
+}
+
+bool ChangeColumnTypes::IsInitialized() const {
+  return true;
+}
+
+void ChangeColumnTypes::InternalSwap(ChangeColumnTypes* other) {
+  using std::swap;
+  _internal_metadata_.InternalSwap(&other->_internal_metadata_);
+  _impl_.change_column_types_.InternalSwap(&other->_impl_.change_column_types_);
+}
+
+::PROTOBUF_NAMESPACE_ID::Metadata ChangeColumnTypes::GetMetadata() const {
+  return ::_pbi::AssignDescriptors(
+      &descriptor_table_greptime_2fv1_2fddl_2eproto_getter, &descriptor_table_greptime_2fv1_2fddl_2eproto_once,
+      file_level_metadata_greptime_2fv1_2fddl_2eproto[14]);
+}
+
+// ===================================================================
+
 class RenameTable::_Internal {
  public:
 };
@@ -5301,7 +5600,7 @@ void RenameTable::InternalSwap(RenameTable* other) {
 ::PROTOBUF_NAMESPACE_ID::Metadata RenameTable::GetMetadata() const {
   return ::_pbi::AssignDescriptors(
       &descriptor_table_greptime_2fv1_2fddl_2eproto_getter, &descriptor_table_greptime_2fv1_2fddl_2eproto_once,
-      file_level_metadata_greptime_2fv1_2fddl_2eproto[14]);
+      file_level_metadata_greptime_2fv1_2fddl_2eproto[15]);
 }
 
 // ===================================================================
@@ -5540,7 +5839,292 @@ void AddColumn::InternalSwap(AddColumn* other) {
 ::PROTOBUF_NAMESPACE_ID::Metadata AddColumn::GetMetadata() const {
   return ::_pbi::AssignDescriptors(
       &descriptor_table_greptime_2fv1_2fddl_2eproto_getter, &descriptor_table_greptime_2fv1_2fddl_2eproto_once,
-      file_level_metadata_greptime_2fv1_2fddl_2eproto[15]);
+      file_level_metadata_greptime_2fv1_2fddl_2eproto[16]);
+}
+
+// ===================================================================
+
+class ChangeColumnType::_Internal {
+ public:
+  static const ::greptime::v1::ColumnDataTypeExtension& target_type_extension(const ChangeColumnType* msg);
+};
+
+const ::greptime::v1::ColumnDataTypeExtension&
+ChangeColumnType::_Internal::target_type_extension(const ChangeColumnType* msg) {
+  return *msg->_impl_.target_type_extension_;
+}
+void ChangeColumnType::clear_target_type_extension() {
+  if (GetArenaForAllocation() == nullptr && _impl_.target_type_extension_ != nullptr) {
+    delete _impl_.target_type_extension_;
+  }
+  _impl_.target_type_extension_ = nullptr;
+}
+ChangeColumnType::ChangeColumnType(::PROTOBUF_NAMESPACE_ID::Arena* arena,
+                         bool is_message_owned)
+  : ::PROTOBUF_NAMESPACE_ID::Message(arena, is_message_owned) {
+  SharedCtor(arena, is_message_owned);
+  // @@protoc_insertion_point(arena_constructor:greptime.v1.ChangeColumnType)
+}
+ChangeColumnType::ChangeColumnType(const ChangeColumnType& from)
+  : ::PROTOBUF_NAMESPACE_ID::Message() {
+  ChangeColumnType* const _this = this; (void)_this;
+  new (&_impl_) Impl_{
+      decltype(_impl_.column_name_){}
+    , decltype(_impl_.target_type_extension_){nullptr}
+    , decltype(_impl_.target_type_){}
+    , /*decltype(_impl_._cached_size_)*/{}};
+
+  _internal_metadata_.MergeFrom<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>(from._internal_metadata_);
+  _impl_.column_name_.InitDefault();
+  #ifdef PROTOBUF_FORCE_COPY_DEFAULT_STRING
+    _impl_.column_name_.Set("", GetArenaForAllocation());
+  #endif // PROTOBUF_FORCE_COPY_DEFAULT_STRING
+  if (!from._internal_column_name().empty()) {
+    _this->_impl_.column_name_.Set(from._internal_column_name(), 
+      _this->GetArenaForAllocation());
+  }
+  if (from._internal_has_target_type_extension()) {
+    _this->_impl_.target_type_extension_ = new ::greptime::v1::ColumnDataTypeExtension(*from._impl_.target_type_extension_);
+  }
+  _this->_impl_.target_type_ = from._impl_.target_type_;
+  // @@protoc_insertion_point(copy_constructor:greptime.v1.ChangeColumnType)
+}
+
+inline void ChangeColumnType::SharedCtor(
+    ::_pb::Arena* arena, bool is_message_owned) {
+  (void)arena;
+  (void)is_message_owned;
+  new (&_impl_) Impl_{
+      decltype(_impl_.column_name_){}
+    , decltype(_impl_.target_type_extension_){nullptr}
+    , decltype(_impl_.target_type_){0}
+    , /*decltype(_impl_._cached_size_)*/{}
+  };
+  _impl_.column_name_.InitDefault();
+  #ifdef PROTOBUF_FORCE_COPY_DEFAULT_STRING
+    _impl_.column_name_.Set("", GetArenaForAllocation());
+  #endif // PROTOBUF_FORCE_COPY_DEFAULT_STRING
+}
+
+ChangeColumnType::~ChangeColumnType() {
+  // @@protoc_insertion_point(destructor:greptime.v1.ChangeColumnType)
+  if (auto *arena = _internal_metadata_.DeleteReturnArena<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>()) {
+  (void)arena;
+    return;
+  }
+  SharedDtor();
+}
+
+inline void ChangeColumnType::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaForAllocation() == nullptr);
+  _impl_.column_name_.Destroy();
+  if (this != internal_default_instance()) delete _impl_.target_type_extension_;
+}
+
+void ChangeColumnType::SetCachedSize(int size) const {
+  _impl_._cached_size_.Set(size);
+}
+
+void ChangeColumnType::Clear() {
+// @@protoc_insertion_point(message_clear_start:greptime.v1.ChangeColumnType)
+  uint32_t cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
+  _impl_.column_name_.ClearToEmpty();
+  if (GetArenaForAllocation() == nullptr && _impl_.target_type_extension_ != nullptr) {
+    delete _impl_.target_type_extension_;
+  }
+  _impl_.target_type_extension_ = nullptr;
+  _impl_.target_type_ = 0;
+  _internal_metadata_.Clear<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>();
+}
+
+const char* ChangeColumnType::_InternalParse(const char* ptr, ::_pbi::ParseContext* ctx) {
+#define CHK_(x) if (PROTOBUF_PREDICT_FALSE(!(x))) goto failure
+  while (!ctx->Done(&ptr)) {
+    uint32_t tag;
+    ptr = ::_pbi::ReadTag(ptr, &tag);
+    switch (tag >> 3) {
+      // string column_name = 1;
+      case 1:
+        if (PROTOBUF_PREDICT_TRUE(static_cast<uint8_t>(tag) == 10)) {
+          auto str = _internal_mutable_column_name();
+          ptr = ::_pbi::InlineGreedyStringParser(str, ptr, ctx);
+          CHK_(ptr);
+          CHK_(::_pbi::VerifyUTF8(str, "greptime.v1.ChangeColumnType.column_name"));
+        } else
+          goto handle_unusual;
+        continue;
+      // .greptime.v1.ColumnDataType target_type = 2;
+      case 2:
+        if (PROTOBUF_PREDICT_TRUE(static_cast<uint8_t>(tag) == 16)) {
+          uint64_t val = ::PROTOBUF_NAMESPACE_ID::internal::ReadVarint64(&ptr);
+          CHK_(ptr);
+          _internal_set_target_type(static_cast<::greptime::v1::ColumnDataType>(val));
+        } else
+          goto handle_unusual;
+        continue;
+      // .greptime.v1.ColumnDataTypeExtension target_type_extension = 3;
+      case 3:
+        if (PROTOBUF_PREDICT_TRUE(static_cast<uint8_t>(tag) == 26)) {
+          ptr = ctx->ParseMessage(_internal_mutable_target_type_extension(), ptr);
+          CHK_(ptr);
+        } else
+          goto handle_unusual;
+        continue;
+      default:
+        goto handle_unusual;
+    }  // switch
+  handle_unusual:
+    if ((tag == 0) || ((tag & 7) == 4)) {
+      CHK_(ptr);
+      ctx->SetLastTag(tag);
+      goto message_done;
+    }
+    ptr = UnknownFieldParse(
+        tag,
+        _internal_metadata_.mutable_unknown_fields<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>(),
+        ptr, ctx);
+    CHK_(ptr != nullptr);
+  }  // while
+message_done:
+  return ptr;
+failure:
+  ptr = nullptr;
+  goto message_done;
+#undef CHK_
+}
+
+uint8_t* ChangeColumnType::_InternalSerialize(
+    uint8_t* target, ::PROTOBUF_NAMESPACE_ID::io::EpsCopyOutputStream* stream) const {
+  // @@protoc_insertion_point(serialize_to_array_start:greptime.v1.ChangeColumnType)
+  uint32_t cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  // string column_name = 1;
+  if (!this->_internal_column_name().empty()) {
+    ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::VerifyUtf8String(
+      this->_internal_column_name().data(), static_cast<int>(this->_internal_column_name().length()),
+      ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::SERIALIZE,
+      "greptime.v1.ChangeColumnType.column_name");
+    target = stream->WriteStringMaybeAliased(
+        1, this->_internal_column_name(), target);
+  }
+
+  // .greptime.v1.ColumnDataType target_type = 2;
+  if (this->_internal_target_type() != 0) {
+    target = stream->EnsureSpace(target);
+    target = ::_pbi::WireFormatLite::WriteEnumToArray(
+      2, this->_internal_target_type(), target);
+  }
+
+  // .greptime.v1.ColumnDataTypeExtension target_type_extension = 3;
+  if (this->_internal_has_target_type_extension()) {
+    target = ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::
+      InternalWriteMessage(3, _Internal::target_type_extension(this),
+        _Internal::target_type_extension(this).GetCachedSize(), target, stream);
+  }
+
+  if (PROTOBUF_PREDICT_FALSE(_internal_metadata_.have_unknown_fields())) {
+    target = ::_pbi::WireFormat::InternalSerializeUnknownFieldsToArray(
+        _internal_metadata_.unknown_fields<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>(::PROTOBUF_NAMESPACE_ID::UnknownFieldSet::default_instance), target, stream);
+  }
+  // @@protoc_insertion_point(serialize_to_array_end:greptime.v1.ChangeColumnType)
+  return target;
+}
+
+size_t ChangeColumnType::ByteSizeLong() const {
+// @@protoc_insertion_point(message_byte_size_start:greptime.v1.ChangeColumnType)
+  size_t total_size = 0;
+
+  uint32_t cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
+  // string column_name = 1;
+  if (!this->_internal_column_name().empty()) {
+    total_size += 1 +
+      ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::StringSize(
+        this->_internal_column_name());
+  }
+
+  // .greptime.v1.ColumnDataTypeExtension target_type_extension = 3;
+  if (this->_internal_has_target_type_extension()) {
+    total_size += 1 +
+      ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::MessageSize(
+        *_impl_.target_type_extension_);
+  }
+
+  // .greptime.v1.ColumnDataType target_type = 2;
+  if (this->_internal_target_type() != 0) {
+    total_size += 1 +
+      ::_pbi::WireFormatLite::EnumSize(this->_internal_target_type());
+  }
+
+  return MaybeComputeUnknownFieldsSize(total_size, &_impl_._cached_size_);
+}
+
+const ::PROTOBUF_NAMESPACE_ID::Message::ClassData ChangeColumnType::_class_data_ = {
+    ::PROTOBUF_NAMESPACE_ID::Message::CopyWithSourceCheck,
+    ChangeColumnType::MergeImpl
+};
+const ::PROTOBUF_NAMESPACE_ID::Message::ClassData*ChangeColumnType::GetClassData() const { return &_class_data_; }
+
+
+void ChangeColumnType::MergeImpl(::PROTOBUF_NAMESPACE_ID::Message& to_msg, const ::PROTOBUF_NAMESPACE_ID::Message& from_msg) {
+  auto* const _this = static_cast<ChangeColumnType*>(&to_msg);
+  auto& from = static_cast<const ChangeColumnType&>(from_msg);
+  // @@protoc_insertion_point(class_specific_merge_from_start:greptime.v1.ChangeColumnType)
+  GOOGLE_DCHECK_NE(&from, _this);
+  uint32_t cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  if (!from._internal_column_name().empty()) {
+    _this->_internal_set_column_name(from._internal_column_name());
+  }
+  if (from._internal_has_target_type_extension()) {
+    _this->_internal_mutable_target_type_extension()->::greptime::v1::ColumnDataTypeExtension::MergeFrom(
+        from._internal_target_type_extension());
+  }
+  if (from._internal_target_type() != 0) {
+    _this->_internal_set_target_type(from._internal_target_type());
+  }
+  _this->_internal_metadata_.MergeFrom<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>(from._internal_metadata_);
+}
+
+void ChangeColumnType::CopyFrom(const ChangeColumnType& from) {
+// @@protoc_insertion_point(class_specific_copy_from_start:greptime.v1.ChangeColumnType)
+  if (&from == this) return;
+  Clear();
+  MergeFrom(from);
+}
+
+bool ChangeColumnType::IsInitialized() const {
+  return true;
+}
+
+void ChangeColumnType::InternalSwap(ChangeColumnType* other) {
+  using std::swap;
+  auto* lhs_arena = GetArenaForAllocation();
+  auto* rhs_arena = other->GetArenaForAllocation();
+  _internal_metadata_.InternalSwap(&other->_internal_metadata_);
+  ::PROTOBUF_NAMESPACE_ID::internal::ArenaStringPtr::InternalSwap(
+      &_impl_.column_name_, lhs_arena,
+      &other->_impl_.column_name_, rhs_arena
+  );
+  ::PROTOBUF_NAMESPACE_ID::internal::memswap<
+      PROTOBUF_FIELD_OFFSET(ChangeColumnType, _impl_.target_type_)
+      + sizeof(ChangeColumnType::_impl_.target_type_)
+      - PROTOBUF_FIELD_OFFSET(ChangeColumnType, _impl_.target_type_extension_)>(
+          reinterpret_cast<char*>(&_impl_.target_type_extension_),
+          reinterpret_cast<char*>(&other->_impl_.target_type_extension_));
+}
+
+::PROTOBUF_NAMESPACE_ID::Metadata ChangeColumnType::GetMetadata() const {
+  return ::_pbi::AssignDescriptors(
+      &descriptor_table_greptime_2fv1_2fddl_2eproto_getter, &descriptor_table_greptime_2fv1_2fddl_2eproto_once,
+      file_level_metadata_greptime_2fv1_2fddl_2eproto[17]);
 }
 
 // ===================================================================
@@ -5743,7 +6327,7 @@ void DropColumn::InternalSwap(DropColumn* other) {
 ::PROTOBUF_NAMESPACE_ID::Metadata DropColumn::GetMetadata() const {
   return ::_pbi::AssignDescriptors(
       &descriptor_table_greptime_2fv1_2fddl_2eproto_getter, &descriptor_table_greptime_2fv1_2fddl_2eproto_once,
-      file_level_metadata_greptime_2fv1_2fddl_2eproto[16]);
+      file_level_metadata_greptime_2fv1_2fddl_2eproto[18]);
 }
 
 // ===================================================================
@@ -5921,7 +6505,7 @@ void TableId::InternalSwap(TableId* other) {
 ::PROTOBUF_NAMESPACE_ID::Metadata TableId::GetMetadata() const {
   return ::_pbi::AssignDescriptors(
       &descriptor_table_greptime_2fv1_2fddl_2eproto_getter, &descriptor_table_greptime_2fv1_2fddl_2eproto_once,
-      file_level_metadata_greptime_2fv1_2fddl_2eproto[17]);
+      file_level_metadata_greptime_2fv1_2fddl_2eproto[19]);
 }
 
 // ===================================================================
@@ -6356,7 +6940,7 @@ void ColumnDef::InternalSwap(ColumnDef* other) {
 ::PROTOBUF_NAMESPACE_ID::Metadata ColumnDef::GetMetadata() const {
   return ::_pbi::AssignDescriptors(
       &descriptor_table_greptime_2fv1_2fddl_2eproto_getter, &descriptor_table_greptime_2fv1_2fddl_2eproto_once,
-      file_level_metadata_greptime_2fv1_2fddl_2eproto[18]);
+      file_level_metadata_greptime_2fv1_2fddl_2eproto[20]);
 }
 
 // ===================================================================
@@ -6589,7 +7173,7 @@ void AddColumnLocation::InternalSwap(AddColumnLocation* other) {
 ::PROTOBUF_NAMESPACE_ID::Metadata AddColumnLocation::GetMetadata() const {
   return ::_pbi::AssignDescriptors(
       &descriptor_table_greptime_2fv1_2fddl_2eproto_getter, &descriptor_table_greptime_2fv1_2fddl_2eproto_once,
-      file_level_metadata_greptime_2fv1_2fddl_2eproto[19]);
+      file_level_metadata_greptime_2fv1_2fddl_2eproto[21]);
 }
 
 // @@protoc_insertion_point(namespace_scope)
@@ -6652,6 +7236,10 @@ template<> PROTOBUF_NOINLINE ::greptime::v1::DropColumns*
 Arena::CreateMaybeMessage< ::greptime::v1::DropColumns >(Arena* arena) {
   return Arena::CreateMessageInternal< ::greptime::v1::DropColumns >(arena);
 }
+template<> PROTOBUF_NOINLINE ::greptime::v1::ChangeColumnTypes*
+Arena::CreateMaybeMessage< ::greptime::v1::ChangeColumnTypes >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::greptime::v1::ChangeColumnTypes >(arena);
+}
 template<> PROTOBUF_NOINLINE ::greptime::v1::RenameTable*
 Arena::CreateMaybeMessage< ::greptime::v1::RenameTable >(Arena* arena) {
   return Arena::CreateMessageInternal< ::greptime::v1::RenameTable >(arena);
@@ -6660,6 +7248,10 @@ template<> PROTOBUF_NOINLINE ::greptime::v1::AddColumn*
 Arena::CreateMaybeMessage< ::greptime::v1::AddColumn >(Arena* arena) {
   return Arena::CreateMessageInternal< ::greptime::v1::AddColumn >(arena);
 }
+template<> PROTOBUF_NOINLINE ::greptime::v1::ChangeColumnType*
+Arena::CreateMaybeMessage< ::greptime::v1::ChangeColumnType >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::greptime::v1::ChangeColumnType >(arena);
+}
 template<> PROTOBUF_NOINLINE ::greptime::v1::DropColumn*
 Arena::CreateMaybeMessage< ::greptime::v1::DropColumn >(Arena* arena) {
   return Arena::CreateMessageInternal< ::greptime::v1::DropColumn >(arena);

c++/greptime/v1/ddl.pb.h

@@ -63,6 +63,12 @@ extern AddColumnsDefaultTypeInternal _AddColumns_default_instance_;
 class AlterExpr;
 struct AlterExprDefaultTypeInternal;
 extern AlterExprDefaultTypeInternal _AlterExpr_default_instance_;
+class ChangeColumnType;
+struct ChangeColumnTypeDefaultTypeInternal;
+extern ChangeColumnTypeDefaultTypeInternal _ChangeColumnType_default_instance_;
+class ChangeColumnTypes;
+struct ChangeColumnTypesDefaultTypeInternal;
+extern ChangeColumnTypesDefaultTypeInternal _ChangeColumnTypes_default_instance_;
 class ColumnDef;
 struct ColumnDefDefaultTypeInternal;
 extern ColumnDefDefaultTypeInternal _ColumnDef_default_instance_;
@@ -118,6 +124,8 @@ template<> ::greptime::v1::AddColumn* Arena::CreateMaybeMessage<::greptime::v1::
 template<> ::greptime::v1::AddColumnLocation* Arena::CreateMaybeMessage<::greptime::v1::AddColumnLocation>(Arena*);
 template<> ::greptime::v1::AddColumns* Arena::CreateMaybeMessage<::greptime::v1::AddColumns>(Arena*);
 template<> ::greptime::v1::AlterExpr* Arena::CreateMaybeMessage<::greptime::v1::AlterExpr>(Arena*);
+template<> ::greptime::v1::ChangeColumnType* Arena::CreateMaybeMessage<::greptime::v1::ChangeColumnType>(Arena*);
+template<> ::greptime::v1::ChangeColumnTypes* Arena::CreateMaybeMessage<::greptime::v1::ChangeColumnTypes>(Arena*);
 template<> ::greptime::v1::ColumnDef* Arena::CreateMaybeMessage<::greptime::v1::ColumnDef>(Arena*);
 template<> ::greptime::v1::CreateDatabaseExpr* Arena::CreateMaybeMessage<::greptime::v1::CreateDatabaseExpr>(Arena*);
 template<> ::greptime::v1::CreateDatabaseExpr_OptionsEntry_DoNotUse* Arena::CreateMaybeMessage<::greptime::v1::CreateDatabaseExpr_OptionsEntry_DoNotUse>(Arena*);
@@ -1384,6 +1392,7 @@ class AlterExpr final :
     kAddColumns = 4,
     kDropColumns = 5,
     kRenameTable = 6,
+    kChangeColumnTypes = 7,
     KIND_NOT_SET = 0,
   };
 
@@ -1471,6 +1480,7 @@ class AlterExpr final :
     kAddColumnsFieldNumber = 4,
     kDropColumnsFieldNumber = 5,
     kRenameTableFieldNumber = 6,
+    kChangeColumnTypesFieldNumber = 7,
   };
   // string catalog_name = 1;
   void clear_catalog_name();
@@ -1568,6 +1578,24 @@ class AlterExpr final :
       ::greptime::v1::RenameTable* rename_table);
   ::greptime::v1::RenameTable* unsafe_arena_release_rename_table();
 
+  // .greptime.v1.ChangeColumnTypes change_column_types = 7;
+  bool has_change_column_types() const;
+  private:
+  bool _internal_has_change_column_types() const;
+  public:
+  void clear_change_column_types();
+  const ::greptime::v1::ChangeColumnTypes& change_column_types() const;
+  PROTOBUF_NODISCARD ::greptime::v1::ChangeColumnTypes* release_change_column_types();
+  ::greptime::v1::ChangeColumnTypes* mutable_change_column_types();
+  void set_allocated_change_column_types(::greptime::v1::ChangeColumnTypes* change_column_types);
+  private:
+  const ::greptime::v1::ChangeColumnTypes& _internal_change_column_types() const;
+  ::greptime::v1::ChangeColumnTypes* _internal_mutable_change_column_types();
+  public:
+  void unsafe_arena_set_allocated_change_column_types(
+      ::greptime::v1::ChangeColumnTypes* change_column_types);
+  ::greptime::v1::ChangeColumnTypes* unsafe_arena_release_change_column_types();
+
   void clear_kind();
   KindCase kind_case() const;
   // @@protoc_insertion_point(class_scope:greptime.v1.AlterExpr)
@@ -1576,6 +1604,7 @@ class AlterExpr final :
   void set_has_add_columns();
   void set_has_drop_columns();
   void set_has_rename_table();
+  void set_has_change_column_types();
 
   inline bool has_kind() const;
   inline void clear_has_kind();
@@ -1593,6 +1622,7 @@ class AlterExpr final :
       ::greptime::v1::AddColumns* add_columns_;
       ::greptime::v1::DropColumns* drop_columns_;
       ::greptime::v1::RenameTable* rename_table_;
+      ::greptime::v1::ChangeColumnTypes* change_column_types_;
     } kind_;
     mutable ::PROTOBUF_NAMESPACE_ID::internal::CachedSize _cached_size_;
     uint32_t _oneof_case_[1];
@@ -2752,6 +2782,163 @@ class DropColumns final :
 };
 // -------------------------------------------------------------------
 
+class ChangeColumnTypes final :
+    public ::PROTOBUF_NAMESPACE_ID::Message /* @@protoc_insertion_point(class_definition:greptime.v1.ChangeColumnTypes) */ {
+ public:
+  inline ChangeColumnTypes() : ChangeColumnTypes(nullptr) {}
+  ~ChangeColumnTypes() override;
+  explicit PROTOBUF_CONSTEXPR ChangeColumnTypes(::PROTOBUF_NAMESPACE_ID::internal::ConstantInitialized);
+
+  ChangeColumnTypes(const ChangeColumnTypes& from);
+  ChangeColumnTypes(ChangeColumnTypes&& from) noexcept
+    : ChangeColumnTypes() {
+    *this = ::std::move(from);
+  }
+
+  inline ChangeColumnTypes& operator=(const ChangeColumnTypes& from) {
+    CopyFrom(from);
+    return *this;
+  }
+  inline ChangeColumnTypes& operator=(ChangeColumnTypes&& from) noexcept {
+    if (this == &from) return *this;
+    if (GetOwningArena() == from.GetOwningArena()
+  #ifdef PROTOBUF_FORCE_COPY_IN_MOVE
+        && GetOwningArena() != nullptr
+  #endif  // !PROTOBUF_FORCE_COPY_IN_MOVE
+    ) {
+      InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+
+  static const ::PROTOBUF_NAMESPACE_ID::Descriptor* descriptor() {
+    return GetDescriptor();
+  }
+  static const ::PROTOBUF_NAMESPACE_ID::Descriptor* GetDescriptor() {
+    return default_instance().GetMetadata().descriptor;
+  }
+  static const ::PROTOBUF_NAMESPACE_ID::Reflection* GetReflection() {
+    return default_instance().GetMetadata().reflection;
+  }
+  static const ChangeColumnTypes& default_instance() {
+    return *internal_default_instance();
+  }
+  static inline const ChangeColumnTypes* internal_default_instance() {
+    return reinterpret_cast<const ChangeColumnTypes*>(
+               &_ChangeColumnTypes_default_instance_);
+  }
+  static constexpr int kIndexInFileMessages =
+    14;
+
+  friend void swap(ChangeColumnTypes& a, ChangeColumnTypes& b) {
+    a.Swap(&b);
+  }
+  inline void Swap(ChangeColumnTypes* other) {
+    if (other == this) return;
+  #ifdef PROTOBUF_FORCE_COPY_IN_SWAP
+    if (GetOwningArena() != nullptr &&
+        GetOwningArena() == other->GetOwningArena()) {
+   #else  // PROTOBUF_FORCE_COPY_IN_SWAP
+    if (GetOwningArena() == other->GetOwningArena()) {
+  #endif  // !PROTOBUF_FORCE_COPY_IN_SWAP
+      InternalSwap(other);
+    } else {
+      ::PROTOBUF_NAMESPACE_ID::internal::GenericSwap(this, other);
+    }
+  }
+  void UnsafeArenaSwap(ChangeColumnTypes* other) {
+    if (other == this) return;
+    GOOGLE_DCHECK(GetOwningArena() == other->GetOwningArena());
+    InternalSwap(other);
+  }
+
+  // implements Message ----------------------------------------------
+
+  ChangeColumnTypes* New(::PROTOBUF_NAMESPACE_ID::Arena* arena = nullptr) const final {
+    return CreateMaybeMessage<ChangeColumnTypes>(arena);
+  }
+  using ::PROTOBUF_NAMESPACE_ID::Message::CopyFrom;
+  void CopyFrom(const ChangeColumnTypes& from);
+  using ::PROTOBUF_NAMESPACE_ID::Message::MergeFrom;
+  void MergeFrom( const ChangeColumnTypes& from) {
+    ChangeColumnTypes::MergeImpl(*this, from);
+  }
+  private:
+  static void MergeImpl(::PROTOBUF_NAMESPACE_ID::Message& to_msg, const ::PROTOBUF_NAMESPACE_ID::Message& from_msg);
+  public:
+  PROTOBUF_ATTRIBUTE_REINITIALIZES void Clear() final;
+  bool IsInitialized() const final;
+
+  size_t ByteSizeLong() const final;
+  const char* _InternalParse(const char* ptr, ::PROTOBUF_NAMESPACE_ID::internal::ParseContext* ctx) final;
+  uint8_t* _InternalSerialize(
+      uint8_t* target, ::PROTOBUF_NAMESPACE_ID::io::EpsCopyOutputStream* stream) const final;
+  int GetCachedSize() const final { return _impl_._cached_size_.Get(); }
+
+  private:
+  void SharedCtor(::PROTOBUF_NAMESPACE_ID::Arena* arena, bool is_message_owned);
+  void SharedDtor();
+  void SetCachedSize(int size) const final;
+  void InternalSwap(ChangeColumnTypes* other);
+
+  private:
+  friend class ::PROTOBUF_NAMESPACE_ID::internal::AnyMetadata;
+  static ::PROTOBUF_NAMESPACE_ID::StringPiece FullMessageName() {
+    return "greptime.v1.ChangeColumnTypes";
+  }
+  protected:
+  explicit ChangeColumnTypes(::PROTOBUF_NAMESPACE_ID::Arena* arena,
+                       bool is_message_owned = false);
+  public:
+
+  static const ClassData _class_data_;
+  const ::PROTOBUF_NAMESPACE_ID::Message::ClassData*GetClassData() const final;
+
+  ::PROTOBUF_NAMESPACE_ID::Metadata GetMetadata() const final;
+
+  // nested types ----------------------------------------------------
+
+  // accessors -------------------------------------------------------
+
+  enum : int {
+    kChangeColumnTypesFieldNumber = 1,
+  };
+  // repeated .greptime.v1.ChangeColumnType change_column_types = 1;
+  int change_column_types_size() const;
+  private:
+  int _internal_change_column_types_size() const;
+  public:
+  void clear_change_column_types();
+  ::greptime::v1::ChangeColumnType* mutable_change_column_types(int index);
+  ::PROTOBUF_NAMESPACE_ID::RepeatedPtrField< ::greptime::v1::ChangeColumnType >*
+      mutable_change_column_types();
+  private:
+  const ::greptime::v1::ChangeColumnType& _internal_change_column_types(int index) const;
+  ::greptime::v1::ChangeColumnType* _internal_add_change_column_types();
+  public:
+  const ::greptime::v1::ChangeColumnType& change_column_types(int index) const;
+  ::greptime::v1::ChangeColumnType* add_change_column_types();
+  const ::PROTOBUF_NAMESPACE_ID::RepeatedPtrField< ::greptime::v1::ChangeColumnType >&
+      change_column_types() const;
+
+  // @@protoc_insertion_point(class_scope:greptime.v1.ChangeColumnTypes)
+ private:
+  class _Internal;
+
+  template <typename T> friend class ::PROTOBUF_NAMESPACE_ID::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
+  struct Impl_ {
+    ::PROTOBUF_NAMESPACE_ID::RepeatedPtrField< ::greptime::v1::ChangeColumnType > change_column_types_;
+    mutable ::PROTOBUF_NAMESPACE_ID::internal::CachedSize _cached_size_;
+  };
+  union { Impl_ _impl_; };
+  friend struct ::TableStruct_greptime_2fv1_2fddl_2eproto;
+};
+// -------------------------------------------------------------------
+
 class RenameTable final :
     public ::PROTOBUF_NAMESPACE_ID::Message /* @@protoc_insertion_point(class_definition:greptime.v1.RenameTable) */ {
  public:
@@ -2800,7 +2987,7 @@ class RenameTable final :
                &_RenameTable_default_instance_);
   }
   static constexpr int kIndexInFileMessages =
-    14;
+    15;
 
   friend void swap(RenameTable& a, RenameTable& b) {
     a.Swap(&b);
@@ -2953,7 +3140,7 @@ class AddColumn final :
                &_AddColumn_default_instance_);
   }
   static constexpr int kIndexInFileMessages =
-    15;
+    16;
 
   friend void swap(AddColumn& a, AddColumn& b) {
     a.Swap(&b);
@@ -3082,6 +3269,190 @@ class AddColumn final :
 };
 // -------------------------------------------------------------------
 
+class ChangeColumnType final :
+    public ::PROTOBUF_NAMESPACE_ID::Message /* @@protoc_insertion_point(class_definition:greptime.v1.ChangeColumnType) */ {
+ public:
+  inline ChangeColumnType() : ChangeColumnType(nullptr) {}
+  ~ChangeColumnType() override;
+  explicit PROTOBUF_CONSTEXPR ChangeColumnType(::PROTOBUF_NAMESPACE_ID::internal::ConstantInitialized);
+
+  ChangeColumnType(const ChangeColumnType& from);
+  ChangeColumnType(ChangeColumnType&& from) noexcept
+    : ChangeColumnType() {
+    *this = ::std::move(from);
+  }
+
+  inline ChangeColumnType& operator=(const ChangeColumnType& from) {
+    CopyFrom(from);
+    return *this;
+  }
+  inline ChangeColumnType& operator=(ChangeColumnType&& from) noexcept {
+    if (this == &from) return *this;
+    if (GetOwningArena() == from.GetOwningArena()
+  #ifdef PROTOBUF_FORCE_COPY_IN_MOVE
+        && GetOwningArena() != nullptr
+  #endif  // !PROTOBUF_FORCE_COPY_IN_MOVE
+    ) {
+      InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+
+  static const ::PROTOBUF_NAMESPACE_ID::Descriptor* descriptor() {
+    return GetDescriptor();
+  }
+  static const ::PROTOBUF_NAMESPACE_ID::Descriptor* GetDescriptor() {
+    return default_instance().GetMetadata().descriptor;
+  }
+  static const ::PROTOBUF_NAMESPACE_ID::Reflection* GetReflection() {
+    return default_instance().GetMetadata().reflection;
+  }
+  static const ChangeColumnType& default_instance() {
+    return *internal_default_instance();
+  }
+  static inline const ChangeColumnType* internal_default_instance() {
+    return reinterpret_cast<const ChangeColumnType*>(
+               &_ChangeColumnType_default_instance_);
+  }
+  static constexpr int kIndexInFileMessages =
+    17;
+
+  friend void swap(ChangeColumnType& a, ChangeColumnType& b) {
+    a.Swap(&b);
+  }
+  inline void Swap(ChangeColumnType* other) {
+    if (other == this) return;
+  #ifdef PROTOBUF_FORCE_COPY_IN_SWAP
+    if (GetOwningArena() != nullptr &&
+        GetOwningArena() == other->GetOwningArena()) {
+   #else  // PROTOBUF_FORCE_COPY_IN_SWAP
+    if (GetOwningArena() == other->GetOwningArena()) {
+  #endif  // !PROTOBUF_FORCE_COPY_IN_SWAP
+      InternalSwap(other);
+    } else {
+      ::PROTOBUF_NAMESPACE_ID::internal::GenericSwap(this, other);
+    }
+  }
+  void UnsafeArenaSwap(ChangeColumnType* other) {
+    if (other == this) return;
+    GOOGLE_DCHECK(GetOwningArena() == other->GetOwningArena());
+    InternalSwap(other);
+  }
+
+  // implements Message ----------------------------------------------
+
+  ChangeColumnType* New(::PROTOBUF_NAMESPACE_ID::Arena* arena = nullptr) const final {
+    return CreateMaybeMessage<ChangeColumnType>(arena);
+  }
+  using ::PROTOBUF_NAMESPACE_ID::Message::CopyFrom;
+  void CopyFrom(const ChangeColumnType& from);
+  using ::PROTOBUF_NAMESPACE_ID::Message::MergeFrom;
+  void MergeFrom( const ChangeColumnType& from) {
+    ChangeColumnType::MergeImpl(*this, from);
+  }
+  private:
+  static void MergeImpl(::PROTOBUF_NAMESPACE_ID::Message& to_msg, const ::PROTOBUF_NAMESPACE_ID::Message& from_msg);
+  public:
+  PROTOBUF_ATTRIBUTE_REINITIALIZES void Clear() final;
+  bool IsInitialized() const final;
+
+  size_t ByteSizeLong() const final;
+  const char* _InternalParse(const char* ptr, ::PROTOBUF_NAMESPACE_ID::internal::ParseContext* ctx) final;
+  uint8_t* _InternalSerialize(
+      uint8_t* target, ::PROTOBUF_NAMESPACE_ID::io::EpsCopyOutputStream* stream) const final;
+  int GetCachedSize() const final { return _impl_._cached_size_.Get(); }
+
+  private:
+  void SharedCtor(::PROTOBUF_NAMESPACE_ID::Arena* arena, bool is_message_owned);
+  void SharedDtor();
+  void SetCachedSize(int size) const final;
+  void InternalSwap(ChangeColumnType* other);
+
+  private:
+  friend class ::PROTOBUF_NAMESPACE_ID::internal::AnyMetadata;
+  static ::PROTOBUF_NAMESPACE_ID::StringPiece FullMessageName() {
+    return "greptime.v1.ChangeColumnType";
+  }
+  protected:
+  explicit ChangeColumnType(::PROTOBUF_NAMESPACE_ID::Arena* arena,
+                       bool is_message_owned = false);
+  public:
+
+  static const ClassData _class_data_;
+  const ::PROTOBUF_NAMESPACE_ID::Message::ClassData*GetClassData() const final;
+
+  ::PROTOBUF_NAMESPACE_ID::Metadata GetMetadata() const final;
+
+  // nested types ----------------------------------------------------
+
+  // accessors -------------------------------------------------------
+
+  enum : int {
+    kColumnNameFieldNumber = 1,
+    kTargetTypeExtensionFieldNumber = 3,
+    kTargetTypeFieldNumber = 2,
+  };
+  // string column_name = 1;
+  void clear_column_name();
+  const std::string& column_name() const;
+  template <typename ArgT0 = const std::string&, typename... ArgT>
+  void set_column_name(ArgT0&& arg0, ArgT... args);
+  std::string* mutable_column_name();
+  PROTOBUF_NODISCARD std::string* release_column_name();
+  void set_allocated_column_name(std::string* column_name);
+  private:
+  const std::string& _internal_column_name() const;
+  inline PROTOBUF_ALWAYS_INLINE void _internal_set_column_name(const std::string& value);
+  std::string* _internal_mutable_column_name();
+  public:
+
+  // .greptime.v1.ColumnDataTypeExtension target_type_extension = 3;
+  bool has_target_type_extension() const;
+  private:
+  bool _internal_has_target_type_extension() const;
+  public:
+  void clear_target_type_extension();
+  const ::greptime::v1::ColumnDataTypeExtension& target_type_extension() const;
+  PROTOBUF_NODISCARD ::greptime::v1::ColumnDataTypeExtension* release_target_type_extension();
+  ::greptime::v1::ColumnDataTypeExtension* mutable_target_type_extension();
+  void set_allocated_target_type_extension(::greptime::v1::ColumnDataTypeExtension* target_type_extension);
+  private:
+  const ::greptime::v1::ColumnDataTypeExtension& _internal_target_type_extension() const;
+  ::greptime::v1::ColumnDataTypeExtension* _internal_mutable_target_type_extension();
+  public:
+  void unsafe_arena_set_allocated_target_type_extension(
+      ::greptime::v1::ColumnDataTypeExtension* target_type_extension);
+  ::greptime::v1::ColumnDataTypeExtension* unsafe_arena_release_target_type_extension();
+
+  // .greptime.v1.ColumnDataType target_type = 2;
+  void clear_target_type();
+  ::greptime::v1::ColumnDataType target_type() const;
+  void set_target_type(::greptime::v1::ColumnDataType value);
+  private:
+  ::greptime::v1::ColumnDataType _internal_target_type() const;
+  void _internal_set_target_type(::greptime::v1::ColumnDataType value);
+  public:
+
+  // @@protoc_insertion_point(class_scope:greptime.v1.ChangeColumnType)
+ private:
+  class _Internal;
+
+  template <typename T> friend class ::PROTOBUF_NAMESPACE_ID::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
+  struct Impl_ {
+    ::PROTOBUF_NAMESPACE_ID::internal::ArenaStringPtr column_name_;
+    ::greptime::v1::ColumnDataTypeExtension* target_type_extension_;
+    int target_type_;
+    mutable ::PROTOBUF_NAMESPACE_ID::internal::CachedSize _cached_size_;
+  };
+  union { Impl_ _impl_; };
+  friend struct ::TableStruct_greptime_2fv1_2fddl_2eproto;
+};
+// -------------------------------------------------------------------
+
 class DropColumn final :
     public ::PROTOBUF_NAMESPACE_ID::Message /* @@protoc_insertion_point(class_definition:greptime.v1.DropColumn) */ {
  public:
@@ -3130,7 +3501,7 @@ class DropColumn final :
                &_DropColumn_default_instance_);
   }
   static constexpr int kIndexInFileMessages =
-    16;
+    18;
 
   friend void swap(DropColumn& a, DropColumn& b) {
     a.Swap(&b);
@@ -3283,7 +3654,7 @@ class TableId final :
                &_TableId_default_instance_);
   }
   static constexpr int kIndexInFileMessages =
-    17;
+    19;
 
   friend void swap(TableId& a, TableId& b) {
     a.Swap(&b);
@@ -3431,7 +3802,7 @@ class ColumnDef final :
                &_ColumnDef_default_instance_);
   }
   static constexpr int kIndexInFileMessages =
-    18;
+    20;
 
   friend void swap(ColumnDef& a, ColumnDef& b) {
     a.Swap(&b);
@@ -3669,7 +4040,7 @@ class AddColumnLocation final :
                &_AddColumnLocation_default_instance_);
   }
   static constexpr int kIndexInFileMessages =
-    19;
+    21;
 
   friend void swap(AddColumnLocation& a, AddColumnLocation& b) {
     a.Swap(&b);
@@ -5838,6 +6209,80 @@ inline ::greptime::v1::RenameTable* AlterExpr::mutable_rename_table() {
   return _msg;
 }
 
+// .greptime.v1.ChangeColumnTypes change_column_types = 7;
+inline bool AlterExpr::_internal_has_change_column_types() const {
+  return kind_case() == kChangeColumnTypes;
+}
+inline bool AlterExpr::has_change_column_types() const {
+  return _internal_has_change_column_types();
+}
+inline void AlterExpr::set_has_change_column_types() {
+  _impl_._oneof_case_[0] = kChangeColumnTypes;
+}
+inline void AlterExpr::clear_change_column_types() {
+  if (_internal_has_change_column_types()) {
+    if (GetArenaForAllocation() == nullptr) {
+      delete _impl_.kind_.change_column_types_;
+    }
+    clear_has_kind();
+  }
+}
+inline ::greptime::v1::ChangeColumnTypes* AlterExpr::release_change_column_types() {
+  // @@protoc_insertion_point(field_release:greptime.v1.AlterExpr.change_column_types)
+  if (_internal_has_change_column_types()) {
+    clear_has_kind();
+    ::greptime::v1::ChangeColumnTypes* temp = _impl_.kind_.change_column_types_;
+    if (GetArenaForAllocation() != nullptr) {
+      temp = ::PROTOBUF_NAMESPACE_ID::internal::DuplicateIfNonNull(temp);
+    }
+    _impl_.kind_.change_column_types_ = nullptr;
+    return temp;
+  } else {
+    return nullptr;
+  }
+}
+inline const ::greptime::v1::ChangeColumnTypes& AlterExpr::_internal_change_column_types() const {
+  return _internal_has_change_column_types()
+      ? *_impl_.kind_.change_column_types_
+      : reinterpret_cast< ::greptime::v1::ChangeColumnTypes&>(::greptime::v1::_ChangeColumnTypes_default_instance_);
+}
+inline const ::greptime::v1::ChangeColumnTypes& AlterExpr::change_column_types() const {
+  // @@protoc_insertion_point(field_get:greptime.v1.AlterExpr.change_column_types)
+  return _internal_change_column_types();
+}
+inline ::greptime::v1::ChangeColumnTypes* AlterExpr::unsafe_arena_release_change_column_types() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:greptime.v1.AlterExpr.change_column_types)
+  if (_internal_has_change_column_types()) {
+    clear_has_kind();
+    ::greptime::v1::ChangeColumnTypes* temp = _impl_.kind_.change_column_types_;
+    _impl_.kind_.change_column_types_ = nullptr;
+    return temp;
+  } else {
+    return nullptr;
+  }
+}
+inline void AlterExpr::unsafe_arena_set_allocated_change_column_types(::greptime::v1::ChangeColumnTypes* change_column_types) {
+  clear_kind();
+  if (change_column_types) {
+    set_has_change_column_types();
+    _impl_.kind_.change_column_types_ = change_column_types;
+  }
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:greptime.v1.AlterExpr.change_column_types)
+}
+inline ::greptime::v1::ChangeColumnTypes* AlterExpr::_internal_mutable_change_column_types() {
+  if (!_internal_has_change_column_types()) {
+    clear_kind();
+    set_has_change_column_types();
+    _impl_.kind_.change_column_types_ = CreateMaybeMessage< ::greptime::v1::ChangeColumnTypes >(GetArenaForAllocation());
+  }
+  return _impl_.kind_.change_column_types_;
+}
+inline ::greptime::v1::ChangeColumnTypes* AlterExpr::mutable_change_column_types() {
+  ::greptime::v1::ChangeColumnTypes* _msg = _internal_mutable_change_column_types();
+  // @@protoc_insertion_point(field_mutable:greptime.v1.AlterExpr.change_column_types)
+  return _msg;
+}
+
 inline bool AlterExpr::has_kind() const {
   return kind_case() != KIND_NOT_SET;
 }
@@ -6724,6 +7169,50 @@ DropColumns::drop_columns() const {
 
 // -------------------------------------------------------------------
 
+// ChangeColumnTypes
+
+// repeated .greptime.v1.ChangeColumnType change_column_types = 1;
+inline int ChangeColumnTypes::_internal_change_column_types_size() const {
+  return _impl_.change_column_types_.size();
+}
+inline int ChangeColumnTypes::change_column_types_size() const {
+  return _internal_change_column_types_size();
+}
+inline void ChangeColumnTypes::clear_change_column_types() {
+  _impl_.change_column_types_.Clear();
+}
+inline ::greptime::v1::ChangeColumnType* ChangeColumnTypes::mutable_change_column_types(int index) {
+  // @@protoc_insertion_point(field_mutable:greptime.v1.ChangeColumnTypes.change_column_types)
+  return _impl_.change_column_types_.Mutable(index);
+}
+inline ::PROTOBUF_NAMESPACE_ID::RepeatedPtrField< ::greptime::v1::ChangeColumnType >*
+ChangeColumnTypes::mutable_change_column_types() {
+  // @@protoc_insertion_point(field_mutable_list:greptime.v1.ChangeColumnTypes.change_column_types)
+  return &_impl_.change_column_types_;
+}
+inline const ::greptime::v1::ChangeColumnType& ChangeColumnTypes::_internal_change_column_types(int index) const {
+  return _impl_.change_column_types_.Get(index);
+}
+inline const ::greptime::v1::ChangeColumnType& ChangeColumnTypes::change_column_types(int index) const {
+  // @@protoc_insertion_point(field_get:greptime.v1.ChangeColumnTypes.change_column_types)
+  return _internal_change_column_types(index);
+}
+inline ::greptime::v1::ChangeColumnType* ChangeColumnTypes::_internal_add_change_column_types() {
+  return _impl_.change_column_types_.Add();
+}
+inline ::greptime::v1::ChangeColumnType* ChangeColumnTypes::add_change_column_types() {
+  ::greptime::v1::ChangeColumnType* _add = _internal_add_change_column_types();
+  // @@protoc_insertion_point(field_add:greptime.v1.ChangeColumnTypes.change_column_types)
+  return _add;
+}
+inline const ::PROTOBUF_NAMESPACE_ID::RepeatedPtrField< ::greptime::v1::ChangeColumnType >&
+ChangeColumnTypes::change_column_types() const {
+  // @@protoc_insertion_point(field_list:greptime.v1.ChangeColumnTypes.change_column_types)
+  return _impl_.change_column_types_;
+}
+
+// -------------------------------------------------------------------
+
 // RenameTable
 
 // string new_table_name = 1;
@@ -6962,6 +7451,165 @@ inline void AddColumn::set_allocated_location(::greptime::v1::AddColumnLocation*
 
 // -------------------------------------------------------------------
 
+// ChangeColumnType
+
+// string column_name = 1;
+inline void ChangeColumnType::clear_column_name() {
+  _impl_.column_name_.ClearToEmpty();
+}
+inline const std::string& ChangeColumnType::column_name() const {
+  // @@protoc_insertion_point(field_get:greptime.v1.ChangeColumnType.column_name)
+  return _internal_column_name();
+}
+template <typename ArgT0, typename... ArgT>
+inline PROTOBUF_ALWAYS_INLINE
+void ChangeColumnType::set_column_name(ArgT0&& arg0, ArgT... args) {
+ 
+ _impl_.column_name_.Set(static_cast<ArgT0 &&>(arg0), args..., GetArenaForAllocation());
+  // @@protoc_insertion_point(field_set:greptime.v1.ChangeColumnType.column_name)
+}
+inline std::string* ChangeColumnType::mutable_column_name() {
+  std::string* _s = _internal_mutable_column_name();
+  // @@protoc_insertion_point(field_mutable:greptime.v1.ChangeColumnType.column_name)
+  return _s;
+}
+inline const std::string& ChangeColumnType::_internal_column_name() const {
+  return _impl_.column_name_.Get();
+}
+inline void ChangeColumnType::_internal_set_column_name(const std::string& value) {
+  
+  _impl_.column_name_.Set(value, GetArenaForAllocation());
+}
+inline std::string* ChangeColumnType::_internal_mutable_column_name() {
+  
+  return _impl_.column_name_.Mutable(GetArenaForAllocation());
+}
+inline std::string* ChangeColumnType::release_column_name() {
+  // @@protoc_insertion_point(field_release:greptime.v1.ChangeColumnType.column_name)
+  return _impl_.column_name_.Release();
+}
+inline void ChangeColumnType::set_allocated_column_name(std::string* column_name) {
+  if (column_name != nullptr) {
+    
+  } else {
+    
+  }
+  _impl_.column_name_.SetAllocated(column_name, GetArenaForAllocation());
+#ifdef PROTOBUF_FORCE_COPY_DEFAULT_STRING
+  if (_impl_.column_name_.IsDefault()) {
+    _impl_.column_name_.Set("", GetArenaForAllocation());
+  }
+#endif // PROTOBUF_FORCE_COPY_DEFAULT_STRING
+  // @@protoc_insertion_point(field_set_allocated:greptime.v1.ChangeColumnType.column_name)
+}
+
+// .greptime.v1.ColumnDataType target_type = 2;
+inline void ChangeColumnType::clear_target_type() {
+  _impl_.target_type_ = 0;
+}
+inline ::greptime::v1::ColumnDataType ChangeColumnType::_internal_target_type() const {
+  return static_cast< ::greptime::v1::ColumnDataType >(_impl_.target_type_);
+}
+inline ::greptime::v1::ColumnDataType ChangeColumnType::target_type() const {
+  // @@protoc_insertion_point(field_get:greptime.v1.ChangeColumnType.target_type)
+  return _internal_target_type();
+}
+inline void ChangeColumnType::_internal_set_target_type(::greptime::v1::ColumnDataType value) {
+  
+  _impl_.target_type_ = value;
+}
+inline void ChangeColumnType::set_target_type(::greptime::v1::ColumnDataType value) {
+  _internal_set_target_type(value);
+  // @@protoc_insertion_point(field_set:greptime.v1.ChangeColumnType.target_type)
+}
+
+// .greptime.v1.ColumnDataTypeExtension target_type_extension = 3;
+inline bool ChangeColumnType::_internal_has_target_type_extension() const {
+  return this != internal_default_instance() && _impl_.target_type_extension_ != nullptr;
+}
+inline bool ChangeColumnType::has_target_type_extension() const {
+  return _internal_has_target_type_extension();
+}
+inline const ::greptime::v1::ColumnDataTypeExtension& ChangeColumnType::_internal_target_type_extension() const {
+  const ::greptime::v1::ColumnDataTypeExtension* p = _impl_.target_type_extension_;
+  return p != nullptr ? *p : reinterpret_cast<const ::greptime::v1::ColumnDataTypeExtension&>(
+      ::greptime::v1::_ColumnDataTypeExtension_default_instance_);
+}
+inline const ::greptime::v1::ColumnDataTypeExtension& ChangeColumnType::target_type_extension() const {
+  // @@protoc_insertion_point(field_get:greptime.v1.ChangeColumnType.target_type_extension)
+  return _internal_target_type_extension();
+}
+inline void ChangeColumnType::unsafe_arena_set_allocated_target_type_extension(
+    ::greptime::v1::ColumnDataTypeExtension* target_type_extension) {
+  if (GetArenaForAllocation() == nullptr) {
+    delete reinterpret_cast<::PROTOBUF_NAMESPACE_ID::MessageLite*>(_impl_.target_type_extension_);
+  }
+  _impl_.target_type_extension_ = target_type_extension;
+  if (target_type_extension) {
+    
+  } else {
+    
+  }
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:greptime.v1.ChangeColumnType.target_type_extension)
+}
+inline ::greptime::v1::ColumnDataTypeExtension* ChangeColumnType::release_target_type_extension() {
+  
+  ::greptime::v1::ColumnDataTypeExtension* temp = _impl_.target_type_extension_;
+  _impl_.target_type_extension_ = nullptr;
+#ifdef PROTOBUF_FORCE_COPY_IN_RELEASE
+  auto* old =  reinterpret_cast<::PROTOBUF_NAMESPACE_ID::MessageLite*>(temp);
+  temp = ::PROTOBUF_NAMESPACE_ID::internal::DuplicateIfNonNull(temp);
+  if (GetArenaForAllocation() == nullptr) { delete old; }
+#else  // PROTOBUF_FORCE_COPY_IN_RELEASE
+  if (GetArenaForAllocation() != nullptr) {
+    temp = ::PROTOBUF_NAMESPACE_ID::internal::DuplicateIfNonNull(temp);
+  }
+#endif  // !PROTOBUF_FORCE_COPY_IN_RELEASE
+  return temp;
+}
+inline ::greptime::v1::ColumnDataTypeExtension* ChangeColumnType::unsafe_arena_release_target_type_extension() {
+  // @@protoc_insertion_point(field_release:greptime.v1.ChangeColumnType.target_type_extension)
+  
+  ::greptime::v1::ColumnDataTypeExtension* temp = _impl_.target_type_extension_;
+  _impl_.target_type_extension_ = nullptr;
+  return temp;
+}
+inline ::greptime::v1::ColumnDataTypeExtension* ChangeColumnType::_internal_mutable_target_type_extension() {
+  
+  if (_impl_.target_type_extension_ == nullptr) {
+    auto* p = CreateMaybeMessage<::greptime::v1::ColumnDataTypeExtension>(GetArenaForAllocation());
+    _impl_.target_type_extension_ = p;
+  }
+  return _impl_.target_type_extension_;
+}
+inline ::greptime::v1::ColumnDataTypeExtension* ChangeColumnType::mutable_target_type_extension() {
+  ::greptime::v1::ColumnDataTypeExtension* _msg = _internal_mutable_target_type_extension();
+  // @@protoc_insertion_point(field_mutable:greptime.v1.ChangeColumnType.target_type_extension)
+  return _msg;
+}
+inline void ChangeColumnType::set_allocated_target_type_extension(::greptime::v1::ColumnDataTypeExtension* target_type_extension) {
+  ::PROTOBUF_NAMESPACE_ID::Arena* message_arena = GetArenaForAllocation();
+  if (message_arena == nullptr) {
+    delete reinterpret_cast< ::PROTOBUF_NAMESPACE_ID::MessageLite*>(_impl_.target_type_extension_);
+  }
+  if (target_type_extension) {
+    ::PROTOBUF_NAMESPACE_ID::Arena* submessage_arena =
+        ::PROTOBUF_NAMESPACE_ID::Arena::InternalGetOwningArena(
+                reinterpret_cast<::PROTOBUF_NAMESPACE_ID::MessageLite*>(target_type_extension));
+    if (message_arena != submessage_arena) {
+      target_type_extension = ::PROTOBUF_NAMESPACE_ID::internal::GetOwnedMessage(
+          message_arena, target_type_extension, submessage_arena);
+    }
+    
+  } else {
+    
+  }
+  _impl_.target_type_extension_ = target_type_extension;
+  // @@protoc_insertion_point(field_set_allocated:greptime.v1.ChangeColumnType.target_type_extension)
+}
+
+// -------------------------------------------------------------------
+
 // DropColumn
 
 // string name = 1;
@@ -7452,6 +8100,10 @@ inline void AddColumnLocation::set_allocated_after_column_name(std::string* afte
 
 // -------------------------------------------------------------------
 
+// -------------------------------------------------------------------
+
+// -------------------------------------------------------------------
+
 
 // @@protoc_insertion_point(namespace_scope)
 

c++/greptime/v1/region/server.pb.cc

@@ -595,6 +595,7 @@ const uint32_t TableStruct_greptime_2fv1_2fregion_2fserver_2eproto::offsets[] PR
   PROTOBUF_FIELD_OFFSET(::greptime::v1::region::AlterRequest, _impl_.region_id_),
   ::_pbi::kInvalidFieldOffsetTag,
   ::_pbi::kInvalidFieldOffsetTag,
+  ::_pbi::kInvalidFieldOffsetTag,
   PROTOBUF_FIELD_OFFSET(::greptime::v1::region::AlterRequest, _impl_.schema_version_),
   PROTOBUF_FIELD_OFFSET(::greptime::v1::region::AlterRequest, _impl_.kind_),
   ~0u,  // no _has_bits_
@@ -677,14 +678,14 @@ static const ::_pbi::MigrationSchema schemas[] PROTOBUF_SECTION_VARIABLE(protode
   { 161, -1, -1, sizeof(::greptime::v1::region::CloseRequest)},
   { 168, -1, -1, sizeof(::greptime::v1::region::AlterRequests)},
   { 175, -1, -1, sizeof(::greptime::v1::region::AlterRequest)},
-  { 186, -1, -1, sizeof(::greptime::v1::region::AddColumns)},
+  { 187, -1, -1, sizeof(::greptime::v1::region::AddColumns)},
-  { 193, -1, -1, sizeof(::greptime::v1::region::DropColumns)},
+  { 194, -1, -1, sizeof(::greptime::v1::region::DropColumns)},
-  { 200, -1, -1, sizeof(::greptime::v1::region::AddColumn)},
+  { 201, -1, -1, sizeof(::greptime::v1::region::AddColumn)},
-  { 208, -1, -1, sizeof(::greptime::v1::region::DropColumn)},
+  { 209, -1, -1, sizeof(::greptime::v1::region::DropColumn)},
-  { 215, -1, -1, sizeof(::greptime::v1::region::FlushRequest)},
+  { 216, -1, -1, sizeof(::greptime::v1::region::FlushRequest)},
-  { 222, -1, -1, sizeof(::greptime::v1::region::CompactRequest)},
+  { 223, -1, -1, sizeof(::greptime::v1::region::CompactRequest)},
-  { 229, -1, -1, sizeof(::greptime::v1::region::TruncateRequest)},
+  { 230, -1, -1, sizeof(::greptime::v1::region::TruncateRequest)},
-  { 236, -1, -1, sizeof(::greptime::v1::region::RegionColumnDef)},
+  { 237, -1, -1, sizeof(::greptime::v1::region::RegionColumnDef)},
 };
 
 static const ::_pb::Message* const file_default_instances[] = {
@@ -778,29 +779,30 @@ const char descriptor_table_protodef_greptime_2fv1_2fregion_2fserver_2eproto[] P
   "ntry\032.\n\014OptionsEntry\022\013\n\003key\030\001 \001(\t\022\r\n\005val"
   "ue\030\002 \001(\t:\0028\001\"!\n\014CloseRequest\022\021\n\tregion_i"
   "d\030\001 \001(\004\"C\n\rAlterRequests\0222\n\010requests\030\001 \003"
-  "(\0132 .greptime.v1.region.AlterRequest\"\261\001\n"
+  "(\0132 .greptime.v1.region.AlterRequest\"\360\001\n"
   "\014AlterRequest\022\021\n\tregion_id\030\001 \001(\004\0225\n\013add_"
   "columns\030\002 \001(\0132\036.greptime.v1.region.AddCo"
   "lumnsH\000\0227\n\014drop_columns\030\003 \001(\0132\037.greptime"
-  ".v1.region.DropColumnsH\000\022\026\n\016schema_versi"
+  ".v1.region.DropColumnsH\000\022=\n\023change_colum"
-  "on\030\004 \001(\004B\006\n\004kind\"@\n\nAddColumns\0222\n\013add_co"
+  "n_types\030\005 \001(\0132\036.greptime.v1.ChangeColumn"
-  "lumns\030\001 \003(\0132\035.greptime.v1.region.AddColu"
+  "TypesH\000\022\026\n\016schema_version\030\004 \001(\004B\006\n\004kind\""
-  "mn\"C\n\013DropColumns\0224\n\014drop_columns\030\001 \003(\0132"
+  "@\n\nAddColumns\0222\n\013add_columns\030\001 \003(\0132\035.gre"
-  "\036.greptime.v1.region.DropColumn\"v\n\tAddCo"
+  "ptime.v1.region.AddColumn\"C\n\013DropColumns"
-  "lumn\0227\n\ncolumn_def\030\001 \001(\0132#.greptime.v1.r"
+  "\0224\n\014drop_columns\030\001 \003(\0132\036.greptime.v1.reg"
-  "egion.RegionColumnDef\0220\n\010location\030\003 \001(\0132"
+  "ion.DropColumn\"v\n\tAddColumn\0227\n\ncolumn_de"
-  "\036.greptime.v1.AddColumnLocation\"\032\n\nDropC"
+  "f\030\001 \001(\0132#.greptime.v1.region.RegionColum"
-  "olumn\022\014\n\004name\030\001 \001(\t\"!\n\014FlushRequest\022\021\n\tr"
+  "nDef\0220\n\010location\030\003 \001(\0132\036.greptime.v1.Add"
-  "egion_id\030\001 \001(\004\"#\n\016CompactRequest\022\021\n\tregi"
+  "ColumnLocation\"\032\n\nDropColumn\022\014\n\004name\030\001 \001"
-  "on_id\030\001 \001(\004\"$\n\017TruncateRequest\022\021\n\tregion"
+  "(\t\"!\n\014FlushRequest\022\021\n\tregion_id\030\001 \001(\004\"#\n"
-  "_id\030\001 \001(\004\"P\n\017RegionColumnDef\022*\n\ncolumn_d"
+  "\016CompactRequest\022\021\n\tregion_id\030\001 \001(\004\"$\n\017Tr"
-  "ef\030\001 \001(\0132\026.greptime.v1.ColumnDef\022\021\n\tcolu"
+  "uncateRequest\022\021\n\tregion_id\030\001 \001(\004\"P\n\017Regi"
-  "mn_id\030\002 \001(\r2Y\n\006Region\022O\n\006Handle\022!.grepti"
+  "onColumnDef\022*\n\ncolumn_def\030\001 \001(\0132\026.grepti"
-  "me.v1.region.RegionRequest\032\".greptime.v1"
+  "me.v1.ColumnDef\022\021\n\tcolumn_id\030\002 \001(\r2Y\n\006Re"
-  ".region.RegionResponseB]\n\025io.greptime.v1"
+  "gion\022O\n\006Handle\022!.greptime.v1.region.Regi"
-  ".regionB\006ServerZ<github.com/GreptimeTeam"
+  "onRequest\032\".greptime.v1.region.RegionRes"
-  "/greptime-proto/go/greptime/v1/regionb\006p"
+  "ponseB]\n\025io.greptime.v1.regionB\006ServerZ<"
-  "roto3"
+  "github.com/GreptimeTeam/greptime-proto/g"
+  "o/greptime/v1/regionb\006proto3"
   ;
 static const ::_pbi::DescriptorTable* const descriptor_table_greptime_2fv1_2fregion_2fserver_2eproto_deps[3] = {
   &::descriptor_table_greptime_2fv1_2fcommon_2eproto,
@@ -809,7 +811,7 @@ static const ::_pbi::DescriptorTable* const descriptor_table_greptime_2fv1_2freg
 };
 static ::_pbi::once_flag descriptor_table_greptime_2fv1_2fregion_2fserver_2eproto_once;
 const ::_pbi::DescriptorTable descriptor_table_greptime_2fv1_2fregion_2fserver_2eproto = {
-    false, false, 3245, descriptor_table_protodef_greptime_2fv1_2fregion_2fserver_2eproto,
+    false, false, 3308, descriptor_table_protodef_greptime_2fv1_2fregion_2fserver_2eproto,
     "greptime/v1/region/server.proto",
     &descriptor_table_greptime_2fv1_2fregion_2fserver_2eproto_once, descriptor_table_greptime_2fv1_2fregion_2fserver_2eproto_deps, 3, 28,
     schemas, file_default_instances, TableStruct_greptime_2fv1_2fregion_2fserver_2eproto::offsets,
@@ -5272,6 +5274,7 @@ class AlterRequest::_Internal {
  public:
   static const ::greptime::v1::region::AddColumns& add_columns(const AlterRequest* msg);
   static const ::greptime::v1::region::DropColumns& drop_columns(const AlterRequest* msg);
+  static const ::greptime::v1::ChangeColumnTypes& change_column_types(const AlterRequest* msg);
 };
 
 const ::greptime::v1::region::AddColumns&
@@ -5282,6 +5285,10 @@ const ::greptime::v1::region::DropColumns&
 AlterRequest::_Internal::drop_columns(const AlterRequest* msg) {
   return *msg->_impl_.kind_.drop_columns_;
 }
+const ::greptime::v1::ChangeColumnTypes&
+AlterRequest::_Internal::change_column_types(const AlterRequest* msg) {
+  return *msg->_impl_.kind_.change_column_types_;
+}
 void AlterRequest::set_allocated_add_columns(::greptime::v1::region::AddColumns* add_columns) {
   ::PROTOBUF_NAMESPACE_ID::Arena* message_arena = GetArenaForAllocation();
   clear_kind();
@@ -5312,6 +5319,30 @@ void AlterRequest::set_allocated_drop_columns(::greptime::v1::region::DropColumn
   }
   // @@protoc_insertion_point(field_set_allocated:greptime.v1.region.AlterRequest.drop_columns)
 }
+void AlterRequest::set_allocated_change_column_types(::greptime::v1::ChangeColumnTypes* change_column_types) {
+  ::PROTOBUF_NAMESPACE_ID::Arena* message_arena = GetArenaForAllocation();
+  clear_kind();
+  if (change_column_types) {
+    ::PROTOBUF_NAMESPACE_ID::Arena* submessage_arena =
+        ::PROTOBUF_NAMESPACE_ID::Arena::InternalGetOwningArena(
+                reinterpret_cast<::PROTOBUF_NAMESPACE_ID::MessageLite*>(change_column_types));
+    if (message_arena != submessage_arena) {
+      change_column_types = ::PROTOBUF_NAMESPACE_ID::internal::GetOwnedMessage(
+          message_arena, change_column_types, submessage_arena);
+    }
+    set_has_change_column_types();
+    _impl_.kind_.change_column_types_ = change_column_types;
+  }
+  // @@protoc_insertion_point(field_set_allocated:greptime.v1.region.AlterRequest.change_column_types)
+}
+void AlterRequest::clear_change_column_types() {
+  if (_internal_has_change_column_types()) {
+    if (GetArenaForAllocation() == nullptr) {
+      delete _impl_.kind_.change_column_types_;
+    }
+    clear_has_kind();
+  }
+}
 AlterRequest::AlterRequest(::PROTOBUF_NAMESPACE_ID::Arena* arena,
                          bool is_message_owned)
   : ::PROTOBUF_NAMESPACE_ID::Message(arena, is_message_owned) {
@@ -5344,6 +5375,11 @@ AlterRequest::AlterRequest(const AlterRequest& from)
           from._internal_drop_columns());
       break;
     }
+    case kChangeColumnTypes: {
+      _this->_internal_mutable_change_column_types()->::greptime::v1::ChangeColumnTypes::MergeFrom(
+          from._internal_change_column_types());
+      break;
+    }
     case KIND_NOT_SET: {
       break;
     }
@@ -5400,6 +5436,12 @@ void AlterRequest::clear_kind() {
       }
       break;
     }
+    case kChangeColumnTypes: {
+      if (GetArenaForAllocation() == nullptr) {
+        delete _impl_.kind_.change_column_types_;
+      }
+      break;
+    }
     case KIND_NOT_SET: {
       break;
     }
@@ -5459,6 +5501,14 @@ const char* AlterRequest::_InternalParse(const char* ptr, ::_pbi::ParseContext*
         } else
           goto handle_unusual;
         continue;
+      // .greptime.v1.ChangeColumnTypes change_column_types = 5;
+      case 5:
+        if (PROTOBUF_PREDICT_TRUE(static_cast<uint8_t>(tag) == 42)) {
+          ptr = ctx->ParseMessage(_internal_mutable_change_column_types(), ptr);
+          CHK_(ptr);
+        } else
+          goto handle_unusual;
+        continue;
       default:
         goto handle_unusual;
     }  // switch
@@ -5514,6 +5564,13 @@ uint8_t* AlterRequest::_InternalSerialize(
     target = ::_pbi::WireFormatLite::WriteUInt64ToArray(4, this->_internal_schema_version(), target);
   }
 
+  // .greptime.v1.ChangeColumnTypes change_column_types = 5;
+  if (_internal_has_change_column_types()) {
+    target = ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::
+      InternalWriteMessage(5, _Internal::change_column_types(this),
+        _Internal::change_column_types(this).GetCachedSize(), target, stream);
+  }
+
   if (PROTOBUF_PREDICT_FALSE(_internal_metadata_.have_unknown_fields())) {
     target = ::_pbi::WireFormat::InternalSerializeUnknownFieldsToArray(
         _internal_metadata_.unknown_fields<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>(::PROTOBUF_NAMESPACE_ID::UnknownFieldSet::default_instance), target, stream);
@@ -5555,6 +5612,13 @@ size_t AlterRequest::ByteSizeLong() const {
           *_impl_.kind_.drop_columns_);
       break;
     }
+    // .greptime.v1.ChangeColumnTypes change_column_types = 5;
+    case kChangeColumnTypes: {
+      total_size += 1 +
+        ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::MessageSize(
+          *_impl_.kind_.change_column_types_);
+      break;
+    }
     case KIND_NOT_SET: {
       break;
     }
@@ -5594,6 +5658,11 @@ void AlterRequest::MergeImpl(::PROTOBUF_NAMESPACE_ID::Message& to_msg, const ::P
           from._internal_drop_columns());
       break;
     }
+    case kChangeColumnTypes: {
+      _this->_internal_mutable_change_column_types()->::greptime::v1::ChangeColumnTypes::MergeFrom(
+          from._internal_change_column_types());
+      break;
+    }
     case KIND_NOT_SET: {
       break;
     }

c++/greptime/v1/region/server.pb.h

@@ -3237,6 +3237,7 @@ class AlterRequest final :
   enum KindCase {
     kAddColumns = 2,
     kDropColumns = 3,
+    kChangeColumnTypes = 5,
     KIND_NOT_SET = 0,
   };
 
@@ -3322,6 +3323,7 @@ class AlterRequest final :
     kSchemaVersionFieldNumber = 4,
     kAddColumnsFieldNumber = 2,
     kDropColumnsFieldNumber = 3,
+    kChangeColumnTypesFieldNumber = 5,
   };
   // uint64 region_id = 1;
   void clear_region_id();
@@ -3377,6 +3379,24 @@ class AlterRequest final :
       ::greptime::v1::region::DropColumns* drop_columns);
   ::greptime::v1::region::DropColumns* unsafe_arena_release_drop_columns();
 
+  // .greptime.v1.ChangeColumnTypes change_column_types = 5;
+  bool has_change_column_types() const;
+  private:
+  bool _internal_has_change_column_types() const;
+  public:
+  void clear_change_column_types();
+  const ::greptime::v1::ChangeColumnTypes& change_column_types() const;
+  PROTOBUF_NODISCARD ::greptime::v1::ChangeColumnTypes* release_change_column_types();
+  ::greptime::v1::ChangeColumnTypes* mutable_change_column_types();
+  void set_allocated_change_column_types(::greptime::v1::ChangeColumnTypes* change_column_types);
+  private:
+  const ::greptime::v1::ChangeColumnTypes& _internal_change_column_types() const;
+  ::greptime::v1::ChangeColumnTypes* _internal_mutable_change_column_types();
+  public:
+  void unsafe_arena_set_allocated_change_column_types(
+      ::greptime::v1::ChangeColumnTypes* change_column_types);
+  ::greptime::v1::ChangeColumnTypes* unsafe_arena_release_change_column_types();
+
   void clear_kind();
   KindCase kind_case() const;
   // @@protoc_insertion_point(class_scope:greptime.v1.region.AlterRequest)
@@ -3384,6 +3404,7 @@ class AlterRequest final :
   class _Internal;
   void set_has_add_columns();
   void set_has_drop_columns();
+  void set_has_change_column_types();
 
   inline bool has_kind() const;
   inline void clear_has_kind();
@@ -3399,6 +3420,7 @@ class AlterRequest final :
         ::PROTOBUF_NAMESPACE_ID::internal::ConstantInitialized _constinit_;
       ::greptime::v1::region::AddColumns* add_columns_;
       ::greptime::v1::region::DropColumns* drop_columns_;
+      ::greptime::v1::ChangeColumnTypes* change_column_types_;
     } kind_;
     mutable ::PROTOBUF_NAMESPACE_ID::internal::CachedSize _cached_size_;
     uint32_t _oneof_case_[1];
@@ -7229,6 +7251,72 @@ inline ::greptime::v1::region::DropColumns* AlterRequest::mutable_drop_columns()
   return _msg;
 }
 
+// .greptime.v1.ChangeColumnTypes change_column_types = 5;
+inline bool AlterRequest::_internal_has_change_column_types() const {
+  return kind_case() == kChangeColumnTypes;
+}
+inline bool AlterRequest::has_change_column_types() const {
+  return _internal_has_change_column_types();
+}
+inline void AlterRequest::set_has_change_column_types() {
+  _impl_._oneof_case_[0] = kChangeColumnTypes;
+}
+inline ::greptime::v1::ChangeColumnTypes* AlterRequest::release_change_column_types() {
+  // @@protoc_insertion_point(field_release:greptime.v1.region.AlterRequest.change_column_types)
+  if (_internal_has_change_column_types()) {
+    clear_has_kind();
+    ::greptime::v1::ChangeColumnTypes* temp = _impl_.kind_.change_column_types_;
+    if (GetArenaForAllocation() != nullptr) {
+      temp = ::PROTOBUF_NAMESPACE_ID::internal::DuplicateIfNonNull(temp);
+    }
+    _impl_.kind_.change_column_types_ = nullptr;
+    return temp;
+  } else {
+    return nullptr;
+  }
+}
+inline const ::greptime::v1::ChangeColumnTypes& AlterRequest::_internal_change_column_types() const {
+  return _internal_has_change_column_types()
+      ? *_impl_.kind_.change_column_types_
+      : reinterpret_cast< ::greptime::v1::ChangeColumnTypes&>(::greptime::v1::_ChangeColumnTypes_default_instance_);
+}
+inline const ::greptime::v1::ChangeColumnTypes& AlterRequest::change_column_types() const {
+  // @@protoc_insertion_point(field_get:greptime.v1.region.AlterRequest.change_column_types)
+  return _internal_change_column_types();
+}
+inline ::greptime::v1::ChangeColumnTypes* AlterRequest::unsafe_arena_release_change_column_types() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:greptime.v1.region.AlterRequest.change_column_types)
+  if (_internal_has_change_column_types()) {
+    clear_has_kind();
+    ::greptime::v1::ChangeColumnTypes* temp = _impl_.kind_.change_column_types_;
+    _impl_.kind_.change_column_types_ = nullptr;
+    return temp;
+  } else {
+    return nullptr;
+  }
+}
+inline void AlterRequest::unsafe_arena_set_allocated_change_column_types(::greptime::v1::ChangeColumnTypes* change_column_types) {
+  clear_kind();
+  if (change_column_types) {
+    set_has_change_column_types();
+    _impl_.kind_.change_column_types_ = change_column_types;
+  }
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:greptime.v1.region.AlterRequest.change_column_types)
+}
+inline ::greptime::v1::ChangeColumnTypes* AlterRequest::_internal_mutable_change_column_types() {
+  if (!_internal_has_change_column_types()) {
+    clear_kind();
+    set_has_change_column_types();
+    _impl_.kind_.change_column_types_ = CreateMaybeMessage< ::greptime::v1::ChangeColumnTypes >(GetArenaForAllocation());
+  }
+  return _impl_.kind_.change_column_types_;
+}
+inline ::greptime::v1::ChangeColumnTypes* AlterRequest::mutable_change_column_types() {
+  ::greptime::v1::ChangeColumnTypes* _msg = _internal_mutable_change_column_types();
+  // @@protoc_insertion_point(field_mutable:greptime.v1.region.AlterRequest.change_column_types)
+  return _msg;
+}
+
 // uint64 schema_version = 4;
 inline void AlterRequest::clear_schema_version() {
   _impl_.schema_version_ = uint64_t{0u};

go/greptime/v1/ddl.pb.go

@@ -77,7 +77,7 @@ func (x AddColumnLocation_LocationType) Number() protoreflect.EnumNumber {
 
 // Deprecated: Use AddColumnLocation_LocationType.Descriptor instead.
 func (AddColumnLocation_LocationType) EnumDescriptor() ([]byte, []int) {
-	return file_greptime_v1_ddl_proto_rawDescGZIP(), []int{16, 0}
+	return file_greptime_v1_ddl_proto_rawDescGZIP(), []int{18, 0}
 }
 
 // "Data Definition Language" requests, that create, modify or delete the
@@ -551,6 +551,7 @@ type AlterExpr struct {
 	//	*AlterExpr_AddColumns
 	//	*AlterExpr_DropColumns
 	//	*AlterExpr_RenameTable
+	//	*AlterExpr_ChangeColumnTypes
 	Kind isAlterExpr_Kind `protobuf_oneof:"kind"`
 }
 
@@ -635,6 +636,13 @@ func (x *AlterExpr) GetRenameTable() *RenameTable {
 	return nil
 }
 
+func (x *AlterExpr) GetChangeColumnTypes() *ChangeColumnTypes {
+	if x, ok := x.GetKind().(*AlterExpr_ChangeColumnTypes); ok {
+		return x.ChangeColumnTypes
+	}
+	return nil
+}
+
 type isAlterExpr_Kind interface {
 	isAlterExpr_Kind()
 }
@@ -651,12 +659,18 @@ type AlterExpr_RenameTable struct {
 	RenameTable *RenameTable `protobuf:"bytes,6,opt,name=rename_table,json=renameTable,proto3,oneof"`
 }
 
+type AlterExpr_ChangeColumnTypes struct {
+	ChangeColumnTypes *ChangeColumnTypes `protobuf:"bytes,7,opt,name=change_column_types,json=changeColumnTypes,proto3,oneof"`
+}
+
 func (*AlterExpr_AddColumns) isAlterExpr_Kind() {}
 
 func (*AlterExpr_DropColumns) isAlterExpr_Kind() {}
 
 func (*AlterExpr_RenameTable) isAlterExpr_Kind() {}
 
+func (*AlterExpr_ChangeColumnTypes) isAlterExpr_Kind() {}
+
 type DropTableExpr struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1035,6 +1049,53 @@ func (x *DropColumns) GetDropColumns() []*DropColumn {
 	return nil
 }
 
+type ChangeColumnTypes struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	ChangeColumnTypes []*ChangeColumnType `protobuf:"bytes,1,rep,name=change_column_types,json=changeColumnTypes,proto3" json:"change_column_types,omitempty"`
+}
+
+func (x *ChangeColumnTypes) Reset() {
+	*x = ChangeColumnTypes{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_greptime_v1_ddl_proto_msgTypes[11]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ChangeColumnTypes) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ChangeColumnTypes) ProtoMessage() {}
+
+func (x *ChangeColumnTypes) ProtoReflect() protoreflect.Message {
+	mi := &file_greptime_v1_ddl_proto_msgTypes[11]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ChangeColumnTypes.ProtoReflect.Descriptor instead.
+func (*ChangeColumnTypes) Descriptor() ([]byte, []int) {
+	return file_greptime_v1_ddl_proto_rawDescGZIP(), []int{11}
+}
+
+func (x *ChangeColumnTypes) GetChangeColumnTypes() []*ChangeColumnType {
+	if x != nil {
+		return x.ChangeColumnTypes
+	}
+	return nil
+}
+
 type RenameTable struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1046,7 +1107,7 @@ type RenameTable struct {
 func (x *RenameTable) Reset() {
 	*x = RenameTable{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_greptime_v1_ddl_proto_msgTypes[11]
+		mi := &file_greptime_v1_ddl_proto_msgTypes[12]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1059,7 +1120,7 @@ func (x *RenameTable) String() string {
 func (*RenameTable) ProtoMessage() {}
 
 func (x *RenameTable) ProtoReflect() protoreflect.Message {
-	mi := &file_greptime_v1_ddl_proto_msgTypes[11]
+	mi := &file_greptime_v1_ddl_proto_msgTypes[12]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1072,7 +1133,7 @@ func (x *RenameTable) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use RenameTable.ProtoReflect.Descriptor instead.
 func (*RenameTable) Descriptor() ([]byte, []int) {
-	return file_greptime_v1_ddl_proto_rawDescGZIP(), []int{11}
+	return file_greptime_v1_ddl_proto_rawDescGZIP(), []int{12}
 }
 
 func (x *RenameTable) GetNewTableName() string {
@@ -1094,7 +1155,7 @@ type AddColumn struct {
 func (x *AddColumn) Reset() {
 	*x = AddColumn{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_greptime_v1_ddl_proto_msgTypes[12]
+		mi := &file_greptime_v1_ddl_proto_msgTypes[13]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1107,7 +1168,7 @@ func (x *AddColumn) String() string {
 func (*AddColumn) ProtoMessage() {}
 
 func (x *AddColumn) ProtoReflect() protoreflect.Message {
-	mi := &file_greptime_v1_ddl_proto_msgTypes[12]
+	mi := &file_greptime_v1_ddl_proto_msgTypes[13]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1120,7 +1181,7 @@ func (x *AddColumn) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use AddColumn.ProtoReflect.Descriptor instead.
 func (*AddColumn) Descriptor() ([]byte, []int) {
-	return file_greptime_v1_ddl_proto_rawDescGZIP(), []int{12}
+	return file_greptime_v1_ddl_proto_rawDescGZIP(), []int{13}
 }
 
 func (x *AddColumn) GetColumnDef() *ColumnDef {
@@ -1137,6 +1198,69 @@ func (x *AddColumn) GetLocation() *AddColumnLocation {
 	return nil
 }
 
+type ChangeColumnType struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	ColumnName          string                   `protobuf:"bytes,1,opt,name=column_name,json=columnName,proto3" json:"column_name,omitempty"`
+	TargetType          ColumnDataType           `protobuf:"varint,2,opt,name=target_type,json=targetType,proto3,enum=greptime.v1.ColumnDataType" json:"target_type,omitempty"`
+	TargetTypeExtension *ColumnDataTypeExtension `protobuf:"bytes,3,opt,name=target_type_extension,json=targetTypeExtension,proto3" json:"target_type_extension,omitempty"`
+}
+
+func (x *ChangeColumnType) Reset() {
+	*x = ChangeColumnType{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_greptime_v1_ddl_proto_msgTypes[14]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ChangeColumnType) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ChangeColumnType) ProtoMessage() {}
+
+func (x *ChangeColumnType) ProtoReflect() protoreflect.Message {
+	mi := &file_greptime_v1_ddl_proto_msgTypes[14]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ChangeColumnType.ProtoReflect.Descriptor instead.
+func (*ChangeColumnType) Descriptor() ([]byte, []int) {
+	return file_greptime_v1_ddl_proto_rawDescGZIP(), []int{14}
+}
+
+func (x *ChangeColumnType) GetColumnName() string {
+	if x != nil {
+		return x.ColumnName
+	}
+	return ""
+}
+
+func (x *ChangeColumnType) GetTargetType() ColumnDataType {
+	if x != nil {
+		return x.TargetType
+	}
+	return ColumnDataType_BOOLEAN
+}
+
+func (x *ChangeColumnType) GetTargetTypeExtension() *ColumnDataTypeExtension {
+	if x != nil {
+		return x.TargetTypeExtension
+	}
+	return nil
+}
+
 type DropColumn struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1148,7 +1272,7 @@ type DropColumn struct {
 func (x *DropColumn) Reset() {
 	*x = DropColumn{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_greptime_v1_ddl_proto_msgTypes[13]
+		mi := &file_greptime_v1_ddl_proto_msgTypes[15]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1161,7 +1285,7 @@ func (x *DropColumn) String() string {
 func (*DropColumn) ProtoMessage() {}
 
 func (x *DropColumn) ProtoReflect() protoreflect.Message {
-	mi := &file_greptime_v1_ddl_proto_msgTypes[13]
+	mi := &file_greptime_v1_ddl_proto_msgTypes[15]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1174,7 +1298,7 @@ func (x *DropColumn) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use DropColumn.ProtoReflect.Descriptor instead.
 func (*DropColumn) Descriptor() ([]byte, []int) {
-	return file_greptime_v1_ddl_proto_rawDescGZIP(), []int{13}
+	return file_greptime_v1_ddl_proto_rawDescGZIP(), []int{15}
 }
 
 func (x *DropColumn) GetName() string {
@@ -1195,7 +1319,7 @@ type TableId struct {
 func (x *TableId) Reset() {
 	*x = TableId{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_greptime_v1_ddl_proto_msgTypes[14]
+		mi := &file_greptime_v1_ddl_proto_msgTypes[16]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1208,7 +1332,7 @@ func (x *TableId) String() string {
 func (*TableId) ProtoMessage() {}
 
 func (x *TableId) ProtoReflect() protoreflect.Message {
-	mi := &file_greptime_v1_ddl_proto_msgTypes[14]
+	mi := &file_greptime_v1_ddl_proto_msgTypes[16]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1221,7 +1345,7 @@ func (x *TableId) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use TableId.ProtoReflect.Descriptor instead.
 func (*TableId) Descriptor() ([]byte, []int) {
-	return file_greptime_v1_ddl_proto_rawDescGZIP(), []int{14}
+	return file_greptime_v1_ddl_proto_rawDescGZIP(), []int{16}
 }
 
 func (x *TableId) GetId() uint32 {
@@ -1249,7 +1373,7 @@ type ColumnDef struct {
 func (x *ColumnDef) Reset() {
 	*x = ColumnDef{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_greptime_v1_ddl_proto_msgTypes[15]
+		mi := &file_greptime_v1_ddl_proto_msgTypes[17]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1262,7 +1386,7 @@ func (x *ColumnDef) String() string {
 func (*ColumnDef) ProtoMessage() {}
 
 func (x *ColumnDef) ProtoReflect() protoreflect.Message {
-	mi := &file_greptime_v1_ddl_proto_msgTypes[15]
+	mi := &file_greptime_v1_ddl_proto_msgTypes[17]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1275,7 +1399,7 @@ func (x *ColumnDef) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ColumnDef.ProtoReflect.Descriptor instead.
 func (*ColumnDef) Descriptor() ([]byte, []int) {
-	return file_greptime_v1_ddl_proto_rawDescGZIP(), []int{15}
+	return file_greptime_v1_ddl_proto_rawDescGZIP(), []int{17}
 }
 
 func (x *ColumnDef) GetName() string {
@@ -1339,7 +1463,7 @@ type AddColumnLocation struct {
 func (x *AddColumnLocation) Reset() {
 	*x = AddColumnLocation{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_greptime_v1_ddl_proto_msgTypes[16]
+		mi := &file_greptime_v1_ddl_proto_msgTypes[18]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1352,7 +1476,7 @@ func (x *AddColumnLocation) String() string {
 func (*AddColumnLocation) ProtoMessage() {}
 
 func (x *AddColumnLocation) ProtoReflect() protoreflect.Message {
-	mi := &file_greptime_v1_ddl_proto_msgTypes[16]
+	mi := &file_greptime_v1_ddl_proto_msgTypes[18]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1365,7 +1489,7 @@ func (x *AddColumnLocation) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use AddColumnLocation.ProtoReflect.Descriptor instead.
 func (*AddColumnLocation) Descriptor() ([]byte, []int) {
-	return file_greptime_v1_ddl_proto_rawDescGZIP(), []int{16}
+	return file_greptime_v1_ddl_proto_rawDescGZIP(), []int{18}
 }
 
 func (x *AddColumnLocation) GetLocationType() AddColumnLocation_LocationType {
@@ -1491,7 +1615,7 @@ var file_greptime_v1_ddl_proto_rawDesc = []byte{
 	0x70, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x12, 0x10, 0x0a, 0x03, 0x6b,
 	0x65, 0x79, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x03, 0x6b, 0x65, 0x79, 0x12, 0x14, 0x0a,
 	0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x05, 0x76, 0x61,
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+	0x6f, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x12, 0x50, 0x0a, 0x0d, 0x6c, 0x6f, 0x63, 0x61, 0x74,
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+	0x2e, 0x67, 0x72, 0x65, 0x70, 0x74, 0x69, 0x6d, 0x65, 0x2e, 0x76, 0x31, 0x2e, 0x41, 0x64, 0x64,
+	0x43, 0x6f, 0x6c, 0x75, 0x6d, 0x6e, 0x4c, 0x6f, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x2e, 0x4c,
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+	0x20, 0x01, 0x28, 0x09, 0x52, 0x0f, 0x61, 0x66, 0x74, 0x65, 0x72, 0x43, 0x6f, 0x6c, 0x75, 0x6d,
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+	0x6e, 0x54, 0x79, 0x70, 0x65, 0x12, 0x09, 0x0a, 0x05, 0x46, 0x49, 0x52, 0x53, 0x54, 0x10, 0x00,
+	0x12, 0x09, 0x0a, 0x05, 0x41, 0x46, 0x54, 0x45, 0x52, 0x10, 0x01, 0x42, 0x4c, 0x0a, 0x0e, 0x69,
+	0x6f, 0x2e, 0x67, 0x72, 0x65, 0x70, 0x74, 0x69, 0x6d, 0x65, 0x2e, 0x76, 0x31, 0x42, 0x03, 0x44,
+	0x64, 0x6c, 0x5a, 0x35, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x47,
+	0x72, 0x65, 0x70, 0x74, 0x69, 0x6d, 0x65, 0x54, 0x65, 0x61, 0x6d, 0x2f, 0x67, 0x72, 0x65, 0x70,
+	0x74, 0x69, 0x6d, 0x65, 0x2d, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2f, 0x67, 0x6f, 0x2f, 0x67, 0x72,
+	0x65, 0x70, 0x74, 0x69, 0x6d, 0x65, 0x2f, 0x76, 0x31, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f,
+	0x33,
 }
 
 var (
@@ -1637,7 +1786,7 @@ func file_greptime_v1_ddl_proto_rawDescGZIP() []byte {
 }
 
 var file_greptime_v1_ddl_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
-var file_greptime_v1_ddl_proto_msgTypes = make([]protoimpl.MessageInfo, 20)
+var file_greptime_v1_ddl_proto_msgTypes = make([]protoimpl.MessageInfo, 22)
 var file_greptime_v1_ddl_proto_goTypes = []interface{}{
 	(AddColumnLocation_LocationType)(0), // 0: greptime.v1.AddColumnLocation.LocationType
 	(*DdlRequest)(nil),                  // 1: greptime.v1.DdlRequest
@@ -1651,19 +1800,21 @@ var file_greptime_v1_ddl_proto_goTypes = []interface{}{
 	(*DropDatabaseExpr)(nil),            // 9: greptime.v1.DropDatabaseExpr
 	(*AddColumns)(nil),                  // 10: greptime.v1.AddColumns
 	(*DropColumns)(nil),                 // 11: greptime.v1.DropColumns
-	(*RenameTable)(nil),                 // 12: greptime.v1.RenameTable
+	(*ChangeColumnTypes)(nil),           // 12: greptime.v1.ChangeColumnTypes
-	(*AddColumn)(nil),                   // 13: greptime.v1.AddColumn
+	(*RenameTable)(nil),                 // 13: greptime.v1.RenameTable
-	(*DropColumn)(nil),                  // 14: greptime.v1.DropColumn
+	(*AddColumn)(nil),                   // 14: greptime.v1.AddColumn
-	(*TableId)(nil),                     // 15: greptime.v1.TableId
+	(*ChangeColumnType)(nil),            // 15: greptime.v1.ChangeColumnType
-	(*ColumnDef)(nil),                   // 16: greptime.v1.ColumnDef
+	(*DropColumn)(nil),                  // 16: greptime.v1.DropColumn
-	(*AddColumnLocation)(nil),           // 17: greptime.v1.AddColumnLocation
+	(*TableId)(nil),                     // 17: greptime.v1.TableId
-	nil,                                 // 18: greptime.v1.CreateFlowTaskExpr.TaskOptionsEntry
+	(*ColumnDef)(nil),                   // 18: greptime.v1.ColumnDef
-	nil,                                 // 19: greptime.v1.CreateTableExpr.TableOptionsEntry
+	(*AddColumnLocation)(nil),           // 19: greptime.v1.AddColumnLocation
-	nil,                                 // 20: greptime.v1.CreateDatabaseExpr.OptionsEntry
+	nil,                                 // 20: greptime.v1.CreateFlowTaskExpr.TaskOptionsEntry
-	(*TableName)(nil),                   // 21: greptime.v1.TableName
+	nil,                                 // 21: greptime.v1.CreateTableExpr.TableOptionsEntry
-	(ColumnDataType)(0),                 // 22: greptime.v1.ColumnDataType
+	nil,                                 // 22: greptime.v1.CreateDatabaseExpr.OptionsEntry
-	(SemanticType)(0),                   // 23: greptime.v1.SemanticType
+	(*TableName)(nil),                   // 23: greptime.v1.TableName
-	(*ColumnDataTypeExtension)(nil),     // 24: greptime.v1.ColumnDataTypeExtension
+	(ColumnDataType)(0),                 // 24: greptime.v1.ColumnDataType
+	(*ColumnDataTypeExtension)(nil),     // 25: greptime.v1.ColumnDataTypeExtension
+	(SemanticType)(0),                   // 26: greptime.v1.SemanticType
 }
 var file_greptime_v1_ddl_proto_depIdxs = []int32{
 	7,  // 0: greptime.v1.DdlRequest.create_database:type_name -> greptime.v1.CreateDatabaseExpr
@@ -1673,31 +1824,35 @@ var file_greptime_v1_ddl_proto_depIdxs = []int32{
 	8,  // 4: greptime.v1.DdlRequest.truncate_table:type_name -> greptime.v1.TruncateTableExpr
 	2,  // 5: greptime.v1.DdlRequest.create_flow_task:type_name -> greptime.v1.CreateFlowTaskExpr
 	3,  // 6: greptime.v1.DdlRequest.drop_flow_task:type_name -> greptime.v1.DropFlowTaskExpr
-	21, // 7: greptime.v1.CreateFlowTaskExpr.source_table_names:type_name -> greptime.v1.TableName
+	23, // 7: greptime.v1.CreateFlowTaskExpr.source_table_names:type_name -> greptime.v1.TableName
-	21, // 8: greptime.v1.CreateFlowTaskExpr.sink_table_name:type_name -> greptime.v1.TableName
+	23, // 8: greptime.v1.CreateFlowTaskExpr.sink_table_name:type_name -> greptime.v1.TableName
-	18, // 9: greptime.v1.CreateFlowTaskExpr.task_options:type_name -> greptime.v1.CreateFlowTaskExpr.TaskOptionsEntry
+	20, // 9: greptime.v1.CreateFlowTaskExpr.task_options:type_name -> greptime.v1.CreateFlowTaskExpr.TaskOptionsEntry
-	16, // 10: greptime.v1.CreateTableExpr.column_defs:type_name -> greptime.v1.ColumnDef
+	18, // 10: greptime.v1.CreateTableExpr.column_defs:type_name -> greptime.v1.ColumnDef
-	19, // 11: greptime.v1.CreateTableExpr.table_options:type_name -> greptime.v1.CreateTableExpr.TableOptionsEntry
+	21, // 11: greptime.v1.CreateTableExpr.table_options:type_name -> greptime.v1.CreateTableExpr.TableOptionsEntry
-	15, // 12: greptime.v1.CreateTableExpr.table_id:type_name -> greptime.v1.TableId
+	17, // 12: greptime.v1.CreateTableExpr.table_id:type_name -> greptime.v1.TableId
 	10, // 13: greptime.v1.AlterExpr.add_columns:type_name -> greptime.v1.AddColumns
 	11, // 14: greptime.v1.AlterExpr.drop_columns:type_name -> greptime.v1.DropColumns
-	12, // 15: greptime.v1.AlterExpr.rename_table:type_name -> greptime.v1.RenameTable
+	13, // 15: greptime.v1.AlterExpr.rename_table:type_name -> greptime.v1.RenameTable
-	15, // 16: greptime.v1.DropTableExpr.table_id:type_name -> greptime.v1.TableId
+	12, // 16: greptime.v1.AlterExpr.change_column_types:type_name -> greptime.v1.ChangeColumnTypes
-	20, // 17: greptime.v1.CreateDatabaseExpr.options:type_name -> greptime.v1.CreateDatabaseExpr.OptionsEntry
+	17, // 17: greptime.v1.DropTableExpr.table_id:type_name -> greptime.v1.TableId
-	15, // 18: greptime.v1.TruncateTableExpr.table_id:type_name -> greptime.v1.TableId
+	22, // 18: greptime.v1.CreateDatabaseExpr.options:type_name -> greptime.v1.CreateDatabaseExpr.OptionsEntry
-	13, // 19: greptime.v1.AddColumns.add_columns:type_name -> greptime.v1.AddColumn
+	17, // 19: greptime.v1.TruncateTableExpr.table_id:type_name -> greptime.v1.TableId
-	14, // 20: greptime.v1.DropColumns.drop_columns:type_name -> greptime.v1.DropColumn
+	14, // 20: greptime.v1.AddColumns.add_columns:type_name -> greptime.v1.AddColumn
-	16, // 21: greptime.v1.AddColumn.column_def:type_name -> greptime.v1.ColumnDef
+	16, // 21: greptime.v1.DropColumns.drop_columns:type_name -> greptime.v1.DropColumn
-	17, // 22: greptime.v1.AddColumn.location:type_name -> greptime.v1.AddColumnLocation
+	15, // 22: greptime.v1.ChangeColumnTypes.change_column_types:type_name -> greptime.v1.ChangeColumnType
-	22, // 23: greptime.v1.ColumnDef.data_type:type_name -> greptime.v1.ColumnDataType
+	18, // 23: greptime.v1.AddColumn.column_def:type_name -> greptime.v1.ColumnDef
-	23, // 24: greptime.v1.ColumnDef.semantic_type:type_name -> greptime.v1.SemanticType
+	19, // 24: greptime.v1.AddColumn.location:type_name -> greptime.v1.AddColumnLocation
-	24, // 25: greptime.v1.ColumnDef.datatype_extension:type_name -> greptime.v1.ColumnDataTypeExtension
+	24, // 25: greptime.v1.ChangeColumnType.target_type:type_name -> greptime.v1.ColumnDataType
-	0,  // 26: greptime.v1.AddColumnLocation.location_type:type_name -> greptime.v1.AddColumnLocation.LocationType
+	25, // 26: greptime.v1.ChangeColumnType.target_type_extension:type_name -> greptime.v1.ColumnDataTypeExtension
-	27, // [27:27] is the sub-list for method output_type
+	24, // 27: greptime.v1.ColumnDef.data_type:type_name -> greptime.v1.ColumnDataType
-	27, // [27:27] is the sub-list for method input_type
+	26, // 28: greptime.v1.ColumnDef.semantic_type:type_name -> greptime.v1.SemanticType
-	27, // [27:27] is the sub-list for extension type_name
+	25, // 29: greptime.v1.ColumnDef.datatype_extension:type_name -> greptime.v1.ColumnDataTypeExtension
-	27, // [27:27] is the sub-list for extension extendee
+	0,  // 30: greptime.v1.AddColumnLocation.location_type:type_name -> greptime.v1.AddColumnLocation.LocationType
-	0,  // [0:27] is the sub-list for field type_name
+	31, // [31:31] is the sub-list for method output_type
+	31, // [31:31] is the sub-list for method input_type
+	31, // [31:31] is the sub-list for extension type_name
+	31, // [31:31] is the sub-list for extension extendee
+	0,  // [0:31] is the sub-list for field type_name
 }
 
 func init() { file_greptime_v1_ddl_proto_init() }
@@ -1840,7 +1995,7 @@ func file_greptime_v1_ddl_proto_init() {
 			}
 		}
 		file_greptime_v1_ddl_proto_msgTypes[11].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*RenameTable); i {
+			switch v := v.(*ChangeColumnTypes); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1852,7 +2007,7 @@ func file_greptime_v1_ddl_proto_init() {
 			}
 		}
 		file_greptime_v1_ddl_proto_msgTypes[12].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*AddColumn); i {
+			switch v := v.(*RenameTable); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1864,7 +2019,7 @@ func file_greptime_v1_ddl_proto_init() {
 			}
 		}
 		file_greptime_v1_ddl_proto_msgTypes[13].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*DropColumn); i {
+			switch v := v.(*AddColumn); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1876,7 +2031,7 @@ func file_greptime_v1_ddl_proto_init() {
 			}
 		}
 		file_greptime_v1_ddl_proto_msgTypes[14].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*TableId); i {
+			switch v := v.(*ChangeColumnType); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1888,7 +2043,7 @@ func file_greptime_v1_ddl_proto_init() {
 			}
 		}
 		file_greptime_v1_ddl_proto_msgTypes[15].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ColumnDef); i {
+			switch v := v.(*DropColumn); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1900,6 +2055,30 @@ func file_greptime_v1_ddl_proto_init() {
 			}
 		}
 		file_greptime_v1_ddl_proto_msgTypes[16].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*TableId); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_greptime_v1_ddl_proto_msgTypes[17].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ColumnDef); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_greptime_v1_ddl_proto_msgTypes[18].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*AddColumnLocation); i {
 			case 0:
 				return &v.state
@@ -1925,6 +2104,7 @@ func file_greptime_v1_ddl_proto_init() {
 		(*AlterExpr_AddColumns)(nil),
 		(*AlterExpr_DropColumns)(nil),
 		(*AlterExpr_RenameTable)(nil),
+		(*AlterExpr_ChangeColumnTypes)(nil),
 	}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
@@ -1932,7 +2112,7 @@ func file_greptime_v1_ddl_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_greptime_v1_ddl_proto_rawDesc,
 			NumEnums:      1,
-			NumMessages:   20,
+			NumMessages:   22,
 			NumExtensions: 0,
 			NumServices:   0,
 		},

java/src/main/java/io/greptime/v1/region/Server.java

@@ -16341,6 +16341,21 @@ java.lang.String defaultValue);
      */
     io.greptime.v1.region.Server.DropColumnsOrBuilder getDropColumnsOrBuilder();
 
+    /**
+     * <code>.greptime.v1.ChangeColumnTypes change_column_types = 5;</code>
+     * @return Whether the changeColumnTypes field is set.
+     */
+    boolean hasChangeColumnTypes();
+    /**
+     * <code>.greptime.v1.ChangeColumnTypes change_column_types = 5;</code>
+     * @return The changeColumnTypes.
+     */
+    io.greptime.v1.Ddl.ChangeColumnTypes getChangeColumnTypes();
+    /**
+     * <code>.greptime.v1.ChangeColumnTypes change_column_types = 5;</code>
+     */
+    io.greptime.v1.Ddl.ChangeColumnTypesOrBuilder getChangeColumnTypesOrBuilder();
+
     /**
      * <pre>
      * The version of the schema before applying the alteration.
@@ -16436,6 +16451,20 @@ java.lang.String defaultValue);
               schemaVersion_ = input.readUInt64();
               break;
             }
+            case 42: {
+              io.greptime.v1.Ddl.ChangeColumnTypes.Builder subBuilder = null;
+              if (kindCase_ == 5) {
+                subBuilder = ((io.greptime.v1.Ddl.ChangeColumnTypes) kind_).toBuilder();
+              }
+              kind_ =
+                  input.readMessage(io.greptime.v1.Ddl.ChangeColumnTypes.parser(), extensionRegistry);
+              if (subBuilder != null) {
+                subBuilder.mergeFrom((io.greptime.v1.Ddl.ChangeColumnTypes) kind_);
+                kind_ = subBuilder.buildPartial();
+              }
+              kindCase_ = 5;
+              break;
+            }
             default: {
               if (!parseUnknownField(
                   input, unknownFields, extensionRegistry, tag)) {
@@ -16477,6 +16506,7 @@ java.lang.String defaultValue);
             com.google.protobuf.AbstractMessage.InternalOneOfEnum {
       ADD_COLUMNS(2),
       DROP_COLUMNS(3),
+      CHANGE_COLUMN_TYPES(5),
       KIND_NOT_SET(0);
       private final int value;
       private KindCase(int value) {
@@ -16496,6 +16526,7 @@ java.lang.String defaultValue);
         switch (value) {
           case 2: return ADD_COLUMNS;
           case 3: return DROP_COLUMNS;
+          case 5: return CHANGE_COLUMN_TYPES;
           case 0: return KIND_NOT_SET;
           default: return null;
         }
@@ -16584,6 +16615,37 @@ java.lang.String defaultValue);
       return io.greptime.v1.region.Server.DropColumns.getDefaultInstance();
     }
 
+    public static final int CHANGE_COLUMN_TYPES_FIELD_NUMBER = 5;
+    /**
+     * <code>.greptime.v1.ChangeColumnTypes change_column_types = 5;</code>
+     * @return Whether the changeColumnTypes field is set.
+     */
+    @java.lang.Override
+    public boolean hasChangeColumnTypes() {
+      return kindCase_ == 5;
+    }
+    /**
+     * <code>.greptime.v1.ChangeColumnTypes change_column_types = 5;</code>
+     * @return The changeColumnTypes.
+     */
+    @java.lang.Override
+    public io.greptime.v1.Ddl.ChangeColumnTypes getChangeColumnTypes() {
+      if (kindCase_ == 5) {
+         return (io.greptime.v1.Ddl.ChangeColumnTypes) kind_;
+      }
+      return io.greptime.v1.Ddl.ChangeColumnTypes.getDefaultInstance();
+    }
+    /**
+     * <code>.greptime.v1.ChangeColumnTypes change_column_types = 5;</code>
+     */
+    @java.lang.Override
+    public io.greptime.v1.Ddl.ChangeColumnTypesOrBuilder getChangeColumnTypesOrBuilder() {
+      if (kindCase_ == 5) {
+         return (io.greptime.v1.Ddl.ChangeColumnTypes) kind_;
+      }
+      return io.greptime.v1.Ddl.ChangeColumnTypes.getDefaultInstance();
+    }
+
     public static final int SCHEMA_VERSION_FIELD_NUMBER = 4;
     private long schemaVersion_;
     /**
@@ -16625,6 +16687,9 @@ java.lang.String defaultValue);
       if (schemaVersion_ != 0L) {
         output.writeUInt64(4, schemaVersion_);
       }
+      if (kindCase_ == 5) {
+        output.writeMessage(5, (io.greptime.v1.Ddl.ChangeColumnTypes) kind_);
+      }
       unknownFields.writeTo(output);
     }
 
@@ -16650,6 +16715,10 @@ java.lang.String defaultValue);
         size += com.google.protobuf.CodedOutputStream
           .computeUInt64Size(4, schemaVersion_);
       }
+      if (kindCase_ == 5) {
+        size += com.google.protobuf.CodedOutputStream
+          .computeMessageSize(5, (io.greptime.v1.Ddl.ChangeColumnTypes) kind_);
+      }
       size += unknownFields.getSerializedSize();
       memoizedSize = size;
       return size;
@@ -16679,6 +16748,10 @@ java.lang.String defaultValue);
           if (!getDropColumns()
               .equals(other.getDropColumns())) return false;
           break;
+        case 5:
+          if (!getChangeColumnTypes()
+              .equals(other.getChangeColumnTypes())) return false;
+          break;
         case 0:
         default:
       }
@@ -16708,6 +16781,10 @@ java.lang.String defaultValue);
           hash = (37 * hash) + DROP_COLUMNS_FIELD_NUMBER;
           hash = (53 * hash) + getDropColumns().hashCode();
           break;
+        case 5:
+          hash = (37 * hash) + CHANGE_COLUMN_TYPES_FIELD_NUMBER;
+          hash = (53 * hash) + getChangeColumnTypes().hashCode();
+          break;
         case 0:
         default:
       }
@@ -16891,6 +16968,13 @@ java.lang.String defaultValue);
             result.kind_ = dropColumnsBuilder_.build();
           }
         }
+        if (kindCase_ == 5) {
+          if (changeColumnTypesBuilder_ == null) {
+            result.kind_ = kind_;
+          } else {
+            result.kind_ = changeColumnTypesBuilder_.build();
+          }
+        }
         result.schemaVersion_ = schemaVersion_;
         result.kindCase_ = kindCase_;
         onBuilt();
@@ -16956,6 +17040,10 @@ java.lang.String defaultValue);
             mergeDropColumns(other.getDropColumns());
             break;
           }
+          case CHANGE_COLUMN_TYPES: {
+            mergeChangeColumnTypes(other.getChangeColumnTypes());
+            break;
+          }
           case KIND_NOT_SET: {
             break;
           }
@@ -17319,6 +17407,148 @@ java.lang.String defaultValue);
         return dropColumnsBuilder_;
       }
 
+      private com.google.protobuf.SingleFieldBuilderV3<
+          io.greptime.v1.Ddl.ChangeColumnTypes, io.greptime.v1.Ddl.ChangeColumnTypes.Builder, io.greptime.v1.Ddl.ChangeColumnTypesOrBuilder> changeColumnTypesBuilder_;
+      /**
+       * <code>.greptime.v1.ChangeColumnTypes change_column_types = 5;</code>
+       * @return Whether the changeColumnTypes field is set.
+       */
+      @java.lang.Override
+      public boolean hasChangeColumnTypes() {
+        return kindCase_ == 5;
+      }
+      /**
+       * <code>.greptime.v1.ChangeColumnTypes change_column_types = 5;</code>
+       * @return The changeColumnTypes.
+       */
+      @java.lang.Override
+      public io.greptime.v1.Ddl.ChangeColumnTypes getChangeColumnTypes() {
+        if (changeColumnTypesBuilder_ == null) {
+          if (kindCase_ == 5) {
+            return (io.greptime.v1.Ddl.ChangeColumnTypes) kind_;
+          }
+          return io.greptime.v1.Ddl.ChangeColumnTypes.getDefaultInstance();
+        } else {
+          if (kindCase_ == 5) {
+            return changeColumnTypesBuilder_.getMessage();
+          }
+          return io.greptime.v1.Ddl.ChangeColumnTypes.getDefaultInstance();
+        }
+      }
+      /**
+       * <code>.greptime.v1.ChangeColumnTypes change_column_types = 5;</code>
+       */
+      public Builder setChangeColumnTypes(io.greptime.v1.Ddl.ChangeColumnTypes value) {
+        if (changeColumnTypesBuilder_ == null) {
+          if (value == null) {
+            throw new NullPointerException();
+          }
+          kind_ = value;
+          onChanged();
+        } else {
+          changeColumnTypesBuilder_.setMessage(value);
+        }
+        kindCase_ = 5;
+        return this;
+      }
+      /**
+       * <code>.greptime.v1.ChangeColumnTypes change_column_types = 5;</code>
+       */
+      public Builder setChangeColumnTypes(
+          io.greptime.v1.Ddl.ChangeColumnTypes.Builder builderForValue) {
+        if (changeColumnTypesBuilder_ == null) {
+          kind_ = builderForValue.build();
+          onChanged();
+        } else {
+          changeColumnTypesBuilder_.setMessage(builderForValue.build());
+        }
+        kindCase_ = 5;
+        return this;
+      }
+      /**
+       * <code>.greptime.v1.ChangeColumnTypes change_column_types = 5;</code>
+       */
+      public Builder mergeChangeColumnTypes(io.greptime.v1.Ddl.ChangeColumnTypes value) {
+        if (changeColumnTypesBuilder_ == null) {
+          if (kindCase_ == 5 &&
+              kind_ != io.greptime.v1.Ddl.ChangeColumnTypes.getDefaultInstance()) {
+            kind_ = io.greptime.v1.Ddl.ChangeColumnTypes.newBuilder((io.greptime.v1.Ddl.ChangeColumnTypes) kind_)
+                .mergeFrom(value).buildPartial();
+          } else {
+            kind_ = value;
+          }
+          onChanged();
+        } else {
+          if (kindCase_ == 5) {
+            changeColumnTypesBuilder_.mergeFrom(value);
+          } else {
+            changeColumnTypesBuilder_.setMessage(value);
+          }
+        }
+        kindCase_ = 5;
+        return this;
+      }
+      /**
+       * <code>.greptime.v1.ChangeColumnTypes change_column_types = 5;</code>
+       */
+      public Builder clearChangeColumnTypes() {
+        if (changeColumnTypesBuilder_ == null) {
+          if (kindCase_ == 5) {
+            kindCase_ = 0;
+            kind_ = null;
+            onChanged();
+          }
+        } else {
+          if (kindCase_ == 5) {
+            kindCase_ = 0;
+            kind_ = null;
+          }
+          changeColumnTypesBuilder_.clear();
+        }
+        return this;
+      }
+      /**
+       * <code>.greptime.v1.ChangeColumnTypes change_column_types = 5;</code>
+       */
+      public io.greptime.v1.Ddl.ChangeColumnTypes.Builder getChangeColumnTypesBuilder() {
+        return getChangeColumnTypesFieldBuilder().getBuilder();
+      }
+      /**
+       * <code>.greptime.v1.ChangeColumnTypes change_column_types = 5;</code>
+       */
+      @java.lang.Override
+      public io.greptime.v1.Ddl.ChangeColumnTypesOrBuilder getChangeColumnTypesOrBuilder() {
+        if ((kindCase_ == 5) && (changeColumnTypesBuilder_ != null)) {
+          return changeColumnTypesBuilder_.getMessageOrBuilder();
+        } else {
+          if (kindCase_ == 5) {
+            return (io.greptime.v1.Ddl.ChangeColumnTypes) kind_;
+          }
+          return io.greptime.v1.Ddl.ChangeColumnTypes.getDefaultInstance();
+        }
+      }
+      /**
+       * <code>.greptime.v1.ChangeColumnTypes change_column_types = 5;</code>
+       */
+      private com.google.protobuf.SingleFieldBuilderV3<
+          io.greptime.v1.Ddl.ChangeColumnTypes, io.greptime.v1.Ddl.ChangeColumnTypes.Builder, io.greptime.v1.Ddl.ChangeColumnTypesOrBuilder> 
+          getChangeColumnTypesFieldBuilder() {
+        if (changeColumnTypesBuilder_ == null) {
+          if (!(kindCase_ == 5)) {
+            kind_ = io.greptime.v1.Ddl.ChangeColumnTypes.getDefaultInstance();
+          }
+          changeColumnTypesBuilder_ = new com.google.protobuf.SingleFieldBuilderV3<
+              io.greptime.v1.Ddl.ChangeColumnTypes, io.greptime.v1.Ddl.ChangeColumnTypes.Builder, io.greptime.v1.Ddl.ChangeColumnTypesOrBuilder>(
+                  (io.greptime.v1.Ddl.ChangeColumnTypes) kind_,
+                  getParentForChildren(),
+                  isClean());
+          kind_ = null;
+        }
+        kindCase_ = 5;
+        onChanged();;
+        return changeColumnTypesBuilder_;
+      }
+
       private long schemaVersion_ ;
       /**
        * <pre>
@@ -22788,29 +23018,30 @@ java.lang.String defaultValue);
       "ntry\032.\n\014OptionsEntry\022\013\n\003key\030\001 \001(\t\022\r\n\005val" +
       "ue\030\002 \001(\t:\0028\001\"!\n\014CloseRequest\022\021\n\tregion_i" +
       "d\030\001 \001(\004\"C\n\rAlterRequests\0222\n\010requests\030\001 \003" +
-      "(\0132 .greptime.v1.region.AlterRequest\"\261\001\n" +
+      "(\0132 .greptime.v1.region.AlterRequest\"\360\001\n" +
       "\014AlterRequest\022\021\n\tregion_id\030\001 \001(\004\0225\n\013add_" +
       "columns\030\002 \001(\0132\036.greptime.v1.region.AddCo" +
       "lumnsH\000\0227\n\014drop_columns\030\003 \001(\0132\037.greptime" +
-      ".v1.region.DropColumnsH\000\022\026\n\016schema_versi" +
+      ".v1.region.DropColumnsH\000\022=\n\023change_colum" +
-      "on\030\004 \001(\004B\006\n\004kind\"@\n\nAddColumns\0222\n\013add_co" +
+      "n_types\030\005 \001(\0132\036.greptime.v1.ChangeColumn" +
-      "lumns\030\001 \003(\0132\035.greptime.v1.region.AddColu" +
+      "TypesH\000\022\026\n\016schema_version\030\004 \001(\004B\006\n\004kind\"" +
-      "mn\"C\n\013DropColumns\0224\n\014drop_columns\030\001 \003(\0132" +
+      "@\n\nAddColumns\0222\n\013add_columns\030\001 \003(\0132\035.gre" +
-      "\036.greptime.v1.region.DropColumn\"v\n\tAddCo" +
+      "ptime.v1.region.AddColumn\"C\n\013DropColumns" +
-      "lumn\0227\n\ncolumn_def\030\001 \001(\0132#.greptime.v1.r" +
+      "\0224\n\014drop_columns\030\001 \003(\0132\036.greptime.v1.reg" +
-      "egion.RegionColumnDef\0220\n\010location\030\003 \001(\0132" +
+      "ion.DropColumn\"v\n\tAddColumn\0227\n\ncolumn_de" +
-      "\036.greptime.v1.AddColumnLocation\"\032\n\nDropC" +
+      "f\030\001 \001(\0132#.greptime.v1.region.RegionColum" +
-      "olumn\022\014\n\004name\030\001 \001(\t\"!\n\014FlushRequest\022\021\n\tr" +
+      "nDef\0220\n\010location\030\003 \001(\0132\036.greptime.v1.Add" +
-      "egion_id\030\001 \001(\004\"#\n\016CompactRequest\022\021\n\tregi" +
+      "ColumnLocation\"\032\n\nDropColumn\022\014\n\004name\030\001 \001" +
-      "on_id\030\001 \001(\004\"$\n\017TruncateRequest\022\021\n\tregion" +
+      "(\t\"!\n\014FlushRequest\022\021\n\tregion_id\030\001 \001(\004\"#\n" +
-      "_id\030\001 \001(\004\"P\n\017RegionColumnDef\022*\n\ncolumn_d" +
+      "\016CompactRequest\022\021\n\tregion_id\030\001 \001(\004\"$\n\017Tr" +
-      "ef\030\001 \001(\0132\026.greptime.v1.ColumnDef\022\021\n\tcolu" +
+      "uncateRequest\022\021\n\tregion_id\030\001 \001(\004\"P\n\017Regi" +
-      "mn_id\030\002 \001(\r2Y\n\006Region\022O\n\006Handle\022!.grepti" +
+      "onColumnDef\022*\n\ncolumn_def\030\001 \001(\0132\026.grepti" +
-      "me.v1.region.RegionRequest\032\".greptime.v1" +
+      "me.v1.ColumnDef\022\021\n\tcolumn_id\030\002 \001(\r2Y\n\006Re" +
-      ".region.RegionResponseB]\n\025io.greptime.v1" +
+      "gion\022O\n\006Handle\022!.greptime.v1.region.Regi" +
-      ".regionB\006ServerZ<github.com/GreptimeTeam" +
+      "onRequest\032\".greptime.v1.region.RegionRes" +
-      "/greptime-proto/go/greptime/v1/regionb\006p" +
+      "ponseB]\n\025io.greptime.v1.regionB\006ServerZ<" +
-      "roto3"
+      "github.com/GreptimeTeam/greptime-proto/g" +
+      "o/greptime/v1/regionb\006proto3"
     };
     descriptor = com.google.protobuf.Descriptors.FileDescriptor
       .internalBuildGeneratedFileFrom(descriptorData,
@@ -22938,7 +23169,7 @@ java.lang.String defaultValue);
     internal_static_greptime_v1_region_AlterRequest_fieldAccessorTable = new
       com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
         internal_static_greptime_v1_region_AlterRequest_descriptor,
-        new java.lang.String[] { "RegionId", "AddColumns", "DropColumns", "SchemaVersion", "Kind", });
+        new java.lang.String[] { "RegionId", "AddColumns", "DropColumns", "ChangeColumnTypes", "SchemaVersion", "Kind", });
     internal_static_greptime_v1_region_AddColumns_descriptor =
       getDescriptor().getMessageTypes().get(16);
     internal_static_greptime_v1_region_AddColumns_fieldAccessorTable = new

proto/greptime/v1/ddl.proto

@@ -80,6 +80,7 @@ message AlterExpr {
     AddColumns add_columns = 4;
     DropColumns drop_columns = 5;
     RenameTable rename_table = 6;
+    ChangeColumnTypes change_column_types = 7;
   }
 }
 
@@ -115,6 +116,8 @@ message AddColumns { repeated AddColumn add_columns = 1; }
 
 message DropColumns { repeated DropColumn drop_columns = 1; }
 
+message ChangeColumnTypes { repeated ChangeColumnType change_column_types = 1; }
+
 message RenameTable { string new_table_name = 1; }
 
 message AddColumn {
@@ -122,6 +125,12 @@ message AddColumn {
   AddColumnLocation location = 3;
 }
 
+message ChangeColumnType {
+    string column_name = 1;
+    ColumnDataType target_type = 2;
+    ColumnDataTypeExtension target_type_extension = 3;
+}
+
 message DropColumn { string name = 1; }
 
 message TableId { uint32 id = 1; }

proto/greptime/v1/region/server.proto

@@ -127,6 +127,7 @@ message AlterRequest {
   oneof kind {
     AddColumns add_columns = 2;
     DropColumns drop_columns = 3;
+    ChangeColumnTypes change_column_types = 5;
   }
   // The version of the schema before applying the alteration.
   uint64 schema_version = 4;