feat: adds MergeScan plan node (#172)

* feat: adds dist_plan to substrait_extension

* feat: adds table_names to CreateViewExpr

* chore: style

Co-authored-by: Jeremyhi <jiachun_feng@proton.me>

* fix: update genearted code

---------

Co-authored-by: Jeremyhi <jiachun_feng@proton.me>

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

@@ -87,7 +87,8 @@ struct DropFlowExprDefaultTypeInternal {
 PROTOBUF_ATTRIBUTE_NO_DESTROY PROTOBUF_CONSTINIT PROTOBUF_ATTRIBUTE_INIT_PRIORITY1 DropFlowExprDefaultTypeInternal _DropFlowExpr_default_instance_;
 PROTOBUF_CONSTEXPR CreateViewExpr::CreateViewExpr(
     ::_pbi::ConstantInitialized): _impl_{
-    /*decltype(_impl_.catalog_name_)*/{&::_pbi::fixed_address_empty_string, ::_pbi::ConstantInitialized{}}
+    /*decltype(_impl_.table_names_)*/{}
+  , /*decltype(_impl_.catalog_name_)*/{&::_pbi::fixed_address_empty_string, ::_pbi::ConstantInitialized{}}
   , /*decltype(_impl_.schema_name_)*/{&::_pbi::fixed_address_empty_string, ::_pbi::ConstantInitialized{}}
   , /*decltype(_impl_.view_name_)*/{&::_pbi::fixed_address_empty_string, ::_pbi::ConstantInitialized{}}
   , /*decltype(_impl_.logical_plan_)*/{&::_pbi::fixed_address_empty_string, ::_pbi::ConstantInitialized{}}
@@ -470,6 +471,7 @@ const uint32_t TableStruct_greptime_2fv1_2fddl_2eproto::offsets[] PROTOBUF_SECTI
   PROTOBUF_FIELD_OFFSET(::greptime::v1::CreateViewExpr, _impl_.logical_plan_),
   PROTOBUF_FIELD_OFFSET(::greptime::v1::CreateViewExpr, _impl_.create_if_not_exists_),
   PROTOBUF_FIELD_OFFSET(::greptime::v1::CreateViewExpr, _impl_.or_replace_),
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::CreateViewExpr, _impl_.table_names_),
   ~0u,  // no _has_bits_
   PROTOBUF_FIELD_OFFSET(::greptime::v1::DropViewExpr, _internal_metadata_),
   ~0u,  // no _extensions_
@@ -666,26 +668,26 @@ static const ::_pbi::MigrationSchema schemas[] PROTOBUF_SECTION_VARIABLE(protode
   { 26, -1, -1, sizeof(::greptime::v1::CreateFlowExpr)},
   { 42, -1, -1, sizeof(::greptime::v1::DropFlowExpr)},
   { 52, -1, -1, sizeof(::greptime::v1::CreateViewExpr)},
-  { 64, -1, -1, sizeof(::greptime::v1::DropViewExpr)},
-  { 75, 83, -1, sizeof(::greptime::v1::CreateTableExpr_TableOptionsEntry_DoNotUse)},
-  { 85, -1, -1, sizeof(::greptime::v1::CreateTableExpr)},
-  { 102, -1, -1, sizeof(::greptime::v1::AlterExpr)},
-  { 116, -1, -1, sizeof(::greptime::v1::DropTableExpr)},
-  { 127, 135, -1, sizeof(::greptime::v1::CreateDatabaseExpr_OptionsEntry_DoNotUse)},
-  { 137, -1, -1, sizeof(::greptime::v1::CreateDatabaseExpr)},
-  { 147, -1, -1, sizeof(::greptime::v1::TruncateTableExpr)},
-  { 157, -1, -1, sizeof(::greptime::v1::DropDatabaseExpr)},
-  { 166, -1, -1, sizeof(::greptime::v1::AddColumns)},
-  { 173, -1, -1, sizeof(::greptime::v1::DropColumns)},
-  { 180, -1, -1, sizeof(::greptime::v1::ChangeColumnTypes)},
-  { 187, -1, -1, sizeof(::greptime::v1::RenameTable)},
-  { 194, -1, -1, sizeof(::greptime::v1::AddColumn)},
-  { 202, -1, -1, sizeof(::greptime::v1::ChangeColumnType)},
-  { 211, -1, -1, sizeof(::greptime::v1::DropColumn)},
-  { 218, -1, -1, sizeof(::greptime::v1::TableId)},
-  { 225, -1, -1, sizeof(::greptime::v1::FlowId)},
-  { 232, -1, -1, sizeof(::greptime::v1::ColumnDef)},
-  { 245, -1, -1, sizeof(::greptime::v1::AddColumnLocation)},
+  { 65, -1, -1, sizeof(::greptime::v1::DropViewExpr)},
+  { 76, 84, -1, sizeof(::greptime::v1::CreateTableExpr_TableOptionsEntry_DoNotUse)},
+  { 86, -1, -1, sizeof(::greptime::v1::CreateTableExpr)},
+  { 103, -1, -1, sizeof(::greptime::v1::AlterExpr)},
+  { 117, -1, -1, sizeof(::greptime::v1::DropTableExpr)},
+  { 128, 136, -1, sizeof(::greptime::v1::CreateDatabaseExpr_OptionsEntry_DoNotUse)},
+  { 138, -1, -1, sizeof(::greptime::v1::CreateDatabaseExpr)},
+  { 148, -1, -1, sizeof(::greptime::v1::TruncateTableExpr)},
+  { 158, -1, -1, sizeof(::greptime::v1::DropDatabaseExpr)},
+  { 167, -1, -1, sizeof(::greptime::v1::AddColumns)},
+  { 174, -1, -1, sizeof(::greptime::v1::DropColumns)},
+  { 181, -1, -1, sizeof(::greptime::v1::ChangeColumnTypes)},
+  { 188, -1, -1, sizeof(::greptime::v1::RenameTable)},
+  { 195, -1, -1, sizeof(::greptime::v1::AddColumn)},
+  { 203, -1, -1, sizeof(::greptime::v1::ChangeColumnType)},
+  { 212, -1, -1, sizeof(::greptime::v1::DropColumn)},
+  { 219, -1, -1, sizeof(::greptime::v1::TableId)},
+  { 226, -1, -1, sizeof(::greptime::v1::FlowId)},
+  { 233, -1, -1, sizeof(::greptime::v1::ColumnDef)},
+  { 246, -1, -1, sizeof(::greptime::v1::AddColumnLocation)},
 };
 
 static const ::_pb::Message* const file_default_instances[] = {
@@ -743,80 +745,81 @@ const char descriptor_table_protodef_greptime_2fv1_2fddl_2eproto[] PROTOBUF_SECT
   "Entry\022\013\n\003key\030\001 \001(\t\022\r\n\005value\030\002 \001(\t:\0028\001\"u\n"
   "\014DropFlowExpr\022\024\n\014catalog_name\030\001 \001(\t\022\021\n\tf"
   "low_name\030\002 \001(\t\022$\n\007flow_id\030\003 \001(\0132\023.grepti"
-  "me.v1.FlowId\022\026\n\016drop_if_exists\030\005 \001(\010\"\226\001\n"
+  "me.v1.FlowId\022\026\n\016drop_if_exists\030\005 \001(\010\"\303\001\n"
   "\016CreateViewExpr\022\024\n\014catalog_name\030\001 \001(\t\022\023\n"
   "\013schema_name\030\002 \001(\t\022\021\n\tview_name\030\003 \001(\t\022\024\n"
   "\014logical_plan\030\004 \001(\014\022\034\n\024create_if_not_exi"
-  "sts\030\005 \001(\010\022\022\n\nor_replace\030\006 \001(\010\"\213\001\n\014DropVi"
-  "ewExpr\022\024\n\014catalog_name\030\001 \001(\t\022\023\n\013schema_n"
-  "ame\030\002 \001(\t\022\021\n\tview_name\030\003 \001(\t\022%\n\007view_id\030"
+  "sts\030\005 \001(\010\022\022\n\nor_replace\030\006 \001(\010\022+\n\013table_n"
+  "ames\030\007 \003(\0132\026.greptime.v1.TableName\"\213\001\n\014D"
+  "ropViewExpr\022\024\n\014catalog_name\030\001 \001(\t\022\023\n\013sch"
+  "ema_name\030\002 \001(\t\022\021\n\tview_name\030\003 \001(\t\022%\n\007vie"
+  "w_id\030\004 \001(\0132\024.greptime.v1.TableId\022\026\n\016drop"
+  "_if_exists\030\005 \001(\010\"\207\003\n\017CreateTableExpr\022\024\n\014"
+  "catalog_name\030\001 \001(\t\022\023\n\013schema_name\030\002 \001(\t\022"
+  "\022\n\ntable_name\030\003 \001(\t\022\014\n\004desc\030\004 \001(\t\022+\n\013col"
+  "umn_defs\030\005 \003(\0132\026.greptime.v1.ColumnDef\022\022"
+  "\n\ntime_index\030\006 \001(\t\022\024\n\014primary_keys\030\007 \003(\t"
+  "\022\034\n\024create_if_not_exists\030\010 \001(\010\022E\n\rtable_"
+  "options\030\t \003(\0132..greptime.v1.CreateTableE"
+  "xpr.TableOptionsEntry\022&\n\010table_id\030\n \001(\0132"
+  "\024.greptime.v1.TableId\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\"\245\002\n\tAlterExpr\022\024\n\014catalog_name"
+  "\030\001 \001(\t\022\023\n\013schema_name\030\002 \001(\t\022\022\n\ntable_nam"
+  "e\030\003 \001(\t\022.\n\013add_columns\030\004 \001(\0132\027.greptime."
+  "v1.AddColumnsH\000\0220\n\014drop_columns\030\005 \001(\0132\030."
+  "greptime.v1.DropColumnsH\000\0220\n\014rename_tabl"
+  "e\030\006 \001(\0132\030.greptime.v1.RenameTableH\000\022=\n\023c"
+  "hange_column_types\030\007 \001(\0132\036.greptime.v1.C"
+  "hangeColumnTypesH\000B\006\n\004kind\"\216\001\n\rDropTable"
+  "Expr\022\024\n\014catalog_name\030\001 \001(\t\022\023\n\013schema_nam"
+  "e\030\002 \001(\t\022\022\n\ntable_name\030\003 \001(\t\022&\n\010table_id\030"
   "\004 \001(\0132\024.greptime.v1.TableId\022\026\n\016drop_if_e"
-  "xists\030\005 \001(\010\"\207\003\n\017CreateTableExpr\022\024\n\014catal"
-  "og_name\030\001 \001(\t\022\023\n\013schema_name\030\002 \001(\t\022\022\n\nta"
-  "ble_name\030\003 \001(\t\022\014\n\004desc\030\004 \001(\t\022+\n\013column_d"
-  "efs\030\005 \003(\0132\026.greptime.v1.ColumnDef\022\022\n\ntim"
-  "e_index\030\006 \001(\t\022\024\n\014primary_keys\030\007 \003(\t\022\034\n\024c"
-  "reate_if_not_exists\030\010 \001(\010\022E\n\rtable_optio"
-  "ns\030\t \003(\0132..greptime.v1.CreateTableExpr.T"
-  "ableOptionsEntry\022&\n\010table_id\030\n \001(\0132\024.gre"
-  "ptime.v1.TableId\022\016\n\006engine\030\014 \001(\t\0323\n\021Tabl"
-  "eOptionsEntry\022\013\n\003key\030\001 \001(\t\022\r\n\005value\030\002 \001("
-  "\t:\0028\001\"\245\002\n\tAlterExpr\022\024\n\014catalog_name\030\001 \001("
-  "\t\022\023\n\013schema_name\030\002 \001(\t\022\022\n\ntable_name\030\003 \001"
-  "(\t\022.\n\013add_columns\030\004 \001(\0132\027.greptime.v1.Ad"
-  "dColumnsH\000\0220\n\014drop_columns\030\005 \001(\0132\030.grept"
-  "ime.v1.DropColumnsH\000\0220\n\014rename_table\030\006 \001"
-  "(\0132\030.greptime.v1.RenameTableH\000\022=\n\023change"
-  "_column_types\030\007 \001(\0132\036.greptime.v1.Change"
-  "ColumnTypesH\000B\006\n\004kind\"\216\001\n\rDropTableExpr\022"
+  "xists\030\005 \001(\010\"\314\001\n\022CreateDatabaseExpr\022\024\n\014ca"
+  "talog_name\030\001 \001(\t\022\023\n\013schema_name\030\002 \001(\t\022\034\n"
+  "\024create_if_not_exists\030\003 \001(\010\022=\n\007options\030\004"
+  " \003(\0132,.greptime.v1.CreateDatabaseExpr.Op"
+  "tionsEntry\032.\n\014OptionsEntry\022\013\n\003key\030\001 \001(\t\022"
+  "\r\n\005value\030\002 \001(\t:\0028\001\"z\n\021TruncateTableExpr\022"
   "\024\n\014catalog_name\030\001 \001(\t\022\023\n\013schema_name\030\002 \001"
   "(\t\022\022\n\ntable_name\030\003 \001(\t\022&\n\010table_id\030\004 \001(\013"
-  "2\024.greptime.v1.TableId\022\026\n\016drop_if_exists"
-  "\030\005 \001(\010\"\314\001\n\022CreateDatabaseExpr\022\024\n\014catalog"
-  "_name\030\001 \001(\t\022\023\n\013schema_name\030\002 \001(\t\022\034\n\024crea"
-  "te_if_not_exists\030\003 \001(\010\022=\n\007options\030\004 \003(\0132"
-  ",.greptime.v1.CreateDatabaseExpr.Options"
-  "Entry\032.\n\014OptionsEntry\022\013\n\003key\030\001 \001(\t\022\r\n\005va"
-  "lue\030\002 \001(\t:\0028\001\"z\n\021TruncateTableExpr\022\024\n\014ca"
-  "talog_name\030\001 \001(\t\022\023\n\013schema_name\030\002 \001(\t\022\022\n"
-  "\ntable_name\030\003 \001(\t\022&\n\010table_id\030\004 \001(\0132\024.gr"
-  "eptime.v1.TableId\"U\n\020DropDatabaseExpr\022\024\n"
-  "\014catalog_name\030\001 \001(\t\022\023\n\013schema_name\030\002 \001(\t"
-  "\022\026\n\016drop_if_exists\030\003 \001(\010\"9\n\nAddColumns\022+"
-  "\n\013add_columns\030\001 \003(\0132\026.greptime.v1.AddCol"
-  "umn\"<\n\013DropColumns\022-\n\014drop_columns\030\001 \003(\013"
-  "2\027.greptime.v1.DropColumn\"O\n\021ChangeColum"
-  "nTypes\022:\n\023change_column_types\030\001 \003(\0132\035.gr"
-  "eptime.v1.ChangeColumnType\"%\n\013RenameTabl"
-  "e\022\026\n\016new_table_name\030\001 \001(\t\"i\n\tAddColumn\022*"
-  "\n\ncolumn_def\030\001 \001(\0132\026.greptime.v1.ColumnD"
-  "ef\0220\n\010location\030\003 \001(\0132\036.greptime.v1.AddCo"
-  "lumnLocation\"\236\001\n\020ChangeColumnType\022\023\n\013col"
-  "umn_name\030\001 \001(\t\0220\n\013target_type\030\002 \001(\0162\033.gr"
-  "eptime.v1.ColumnDataType\022C\n\025target_type_"
-  "extension\030\003 \001(\0132$.greptime.v1.ColumnData"
-  "TypeExtension\"\032\n\nDropColumn\022\014\n\004name\030\001 \001("
-  "\t\"\025\n\007TableId\022\n\n\002id\030\001 \001(\r\"\024\n\006FlowId\022\n\n\002id"
-  "\030\001 \001(\r\"\377\001\n\tColumnDef\022\014\n\004name\030\001 \001(\t\022.\n\tda"
-  "ta_type\030\002 \001(\0162\033.greptime.v1.ColumnDataTy"
-  "pe\022\023\n\013is_nullable\030\003 \001(\010\022\032\n\022default_const"
-  "raint\030\004 \001(\014\0220\n\rsemantic_type\030\005 \001(\0162\031.gre"
-  "ptime.v1.SemanticType\022\017\n\007comment\030\006 \001(\t\022@"
-  "\n\022datatype_extension\030\007 \001(\0132$.greptime.v1"
-  ".ColumnDataTypeExtension\"\230\001\n\021AddColumnLo"
-  "cation\022B\n\rlocation_type\030\001 \001(\0162+.greptime"
-  ".v1.AddColumnLocation.LocationType\022\031\n\021af"
-  "ter_column_name\030\002 \001(\t\"$\n\014LocationType\022\t\n"
-  "\005FIRST\020\000\022\t\n\005AFTER\020\001BL\n\016io.greptime.v1B\003D"
-  "dlZ5github.com/GreptimeTeam/greptime-pro"
-  "to/go/greptime/v1b\006proto3"
+  "2\024.greptime.v1.TableId\"U\n\020DropDatabaseEx"
+  "pr\022\024\n\014catalog_name\030\001 \001(\t\022\023\n\013schema_name\030"
+  "\002 \001(\t\022\026\n\016drop_if_exists\030\003 \001(\010\"9\n\nAddColu"
+  "mns\022+\n\013add_columns\030\001 \003(\0132\026.greptime.v1.A"
+  "ddColumn\"<\n\013DropColumns\022-\n\014drop_columns\030"
+  "\001 \003(\0132\027.greptime.v1.DropColumn\"O\n\021Change"
+  "ColumnTypes\022:\n\023change_column_types\030\001 \003(\013"
+  "2\035.greptime.v1.ChangeColumnType\"%\n\013Renam"
+  "eTable\022\026\n\016new_table_name\030\001 \001(\t\"i\n\tAddCol"
+  "umn\022*\n\ncolumn_def\030\001 \001(\0132\026.greptime.v1.Co"
+  "lumnDef\0220\n\010location\030\003 \001(\0132\036.greptime.v1."
+  "AddColumnLocation\"\236\001\n\020ChangeColumnType\022\023"
+  "\n\013column_name\030\001 \001(\t\0220\n\013target_type\030\002 \001(\016"
+  "2\033.greptime.v1.ColumnDataType\022C\n\025target_"
+  "type_extension\030\003 \001(\0132$.greptime.v1.Colum"
+  "nDataTypeExtension\"\032\n\nDropColumn\022\014\n\004name"
+  "\030\001 \001(\t\"\025\n\007TableId\022\n\n\002id\030\001 \001(\r\"\024\n\006FlowId\022"
+  "\n\n\002id\030\001 \001(\r\"\377\001\n\tColumnDef\022\014\n\004name\030\001 \001(\t\022"
+  ".\n\tdata_type\030\002 \001(\0162\033.greptime.v1.ColumnD"
+  "ataType\022\023\n\013is_nullable\030\003 \001(\010\022\032\n\022default_"
+  "constraint\030\004 \001(\014\0220\n\rsemantic_type\030\005 \001(\0162"
+  "\031.greptime.v1.SemanticType\022\017\n\007comment\030\006 "
+  "\001(\t\022@\n\022datatype_extension\030\007 \001(\0132$.grepti"
+  "me.v1.ColumnDataTypeExtension\"\230\001\n\021AddCol"
+  "umnLocation\022B\n\rlocation_type\030\001 \001(\0162+.gre"
+  "ptime.v1.AddColumnLocation.LocationType\022"
+  "\031\n\021after_column_name\030\002 \001(\t\"$\n\014LocationTy"
+  "pe\022\t\n\005FIRST\020\000\022\t\n\005AFTER\020\001BL\n\016io.greptime."
+  "v1B\003DdlZ5github.com/GreptimeTeam/greptim"
+  "e-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, 3705, descriptor_table_protodef_greptime_2fv1_2fddl_2eproto,
+    false, false, 3750, 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, 25,
     schemas, file_default_instances, TableStruct_greptime_2fv1_2fddl_2eproto::offsets,
@@ -2522,6 +2525,9 @@ class CreateViewExpr::_Internal {
  public:
 };
 
+void CreateViewExpr::clear_table_names() {
+  _impl_.table_names_.Clear();
+}
 CreateViewExpr::CreateViewExpr(::PROTOBUF_NAMESPACE_ID::Arena* arena,
                          bool is_message_owned)
   : ::PROTOBUF_NAMESPACE_ID::Message(arena, is_message_owned) {
@@ -2532,7 +2538,8 @@ CreateViewExpr::CreateViewExpr(const CreateViewExpr& from)
   : ::PROTOBUF_NAMESPACE_ID::Message() {
   CreateViewExpr* const _this = this; (void)_this;
   new (&_impl_) Impl_{
-      decltype(_impl_.catalog_name_){}
+      decltype(_impl_.table_names_){from._impl_.table_names_}
+    , decltype(_impl_.catalog_name_){}
     , decltype(_impl_.schema_name_){}
     , decltype(_impl_.view_name_){}
     , decltype(_impl_.logical_plan_){}
@@ -2584,7 +2591,8 @@ inline void CreateViewExpr::SharedCtor(
   (void)arena;
   (void)is_message_owned;
   new (&_impl_) Impl_{
-      decltype(_impl_.catalog_name_){}
+      decltype(_impl_.table_names_){arena}
+    , decltype(_impl_.catalog_name_){}
     , decltype(_impl_.schema_name_){}
     , decltype(_impl_.view_name_){}
     , decltype(_impl_.logical_plan_){}
@@ -2621,6 +2629,7 @@ CreateViewExpr::~CreateViewExpr() {
 
 inline void CreateViewExpr::SharedDtor() {
   GOOGLE_DCHECK(GetArenaForAllocation() == nullptr);
+  _impl_.table_names_.~RepeatedPtrField();
   _impl_.catalog_name_.Destroy();
   _impl_.schema_name_.Destroy();
   _impl_.view_name_.Destroy();
@@ -2637,6 +2646,7 @@ void CreateViewExpr::Clear() {
   // Prevent compiler warnings about cached_has_bits being unused
   (void) cached_has_bits;
 
+  _impl_.table_names_.Clear();
   _impl_.catalog_name_.ClearToEmpty();
   _impl_.schema_name_.ClearToEmpty();
   _impl_.view_name_.ClearToEmpty();
@@ -2708,6 +2718,19 @@ const char* CreateViewExpr::_InternalParse(const char* ptr, ::_pbi::ParseContext
         } else
           goto handle_unusual;
         continue;
+      // repeated .greptime.v1.TableName table_names = 7;
+      case 7:
+        if (PROTOBUF_PREDICT_TRUE(static_cast<uint8_t>(tag) == 58)) {
+          ptr -= 1;
+          do {
+            ptr += 1;
+            ptr = ctx->ParseMessage(_internal_add_table_names(), ptr);
+            CHK_(ptr);
+            if (!ctx->DataAvailable(ptr)) break;
+          } while (::PROTOBUF_NAMESPACE_ID::internal::ExpectTag<58>(ptr));
+        } else
+          goto handle_unusual;
+        continue;
       default:
         goto handle_unusual;
     }  // switch
@@ -2785,6 +2808,14 @@ uint8_t* CreateViewExpr::_InternalSerialize(
     target = ::_pbi::WireFormatLite::WriteBoolToArray(6, this->_internal_or_replace(), target);
   }
 
+  // repeated .greptime.v1.TableName table_names = 7;
+  for (unsigned i = 0,
+      n = static_cast<unsigned>(this->_internal_table_names_size()); i < n; i++) {
+    const auto& repfield = this->_internal_table_names(i);
+    target = ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::
+        InternalWriteMessage(7, 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);
@@ -2801,6 +2832,13 @@ size_t CreateViewExpr::ByteSizeLong() const {
   // Prevent compiler warnings about cached_has_bits being unused
   (void) cached_has_bits;
 
+  // repeated .greptime.v1.TableName table_names = 7;
+  total_size += 1UL * this->_internal_table_names_size();
+  for (const auto& msg : this->_impl_.table_names_) {
+    total_size +=
+      ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::MessageSize(msg);
+  }
+
   // string catalog_name = 1;
   if (!this->_internal_catalog_name().empty()) {
     total_size += 1 +
@@ -2857,6 +2895,7 @@ void CreateViewExpr::MergeImpl(::PROTOBUF_NAMESPACE_ID::Message& to_msg, const :
   uint32_t cached_has_bits = 0;
   (void) cached_has_bits;
 
+  _this->_impl_.table_names_.MergeFrom(from._impl_.table_names_);
   if (!from._internal_catalog_name().empty()) {
     _this->_internal_set_catalog_name(from._internal_catalog_name());
   }
@@ -2894,6 +2933,7 @@ void CreateViewExpr::InternalSwap(CreateViewExpr* other) {
   auto* lhs_arena = GetArenaForAllocation();
   auto* rhs_arena = other->GetArenaForAllocation();
   _internal_metadata_.InternalSwap(&other->_internal_metadata_);
+  _impl_.table_names_.InternalSwap(&other->_impl_.table_names_);
   ::PROTOBUF_NAMESPACE_ID::internal::ArenaStringPtr::InternalSwap(
       &_impl_.catalog_name_, lhs_arena,
       &other->_impl_.catalog_name_, rhs_arena

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

@@ -1193,6 +1193,7 @@ class CreateViewExpr final :
   // accessors -------------------------------------------------------
 
   enum : int {
+    kTableNamesFieldNumber = 7,
     kCatalogNameFieldNumber = 1,
     kSchemaNameFieldNumber = 2,
     kViewNameFieldNumber = 3,
@@ -1200,6 +1201,24 @@ class CreateViewExpr final :
     kCreateIfNotExistsFieldNumber = 5,
     kOrReplaceFieldNumber = 6,
   };
+  // repeated .greptime.v1.TableName table_names = 7;
+  int table_names_size() const;
+  private:
+  int _internal_table_names_size() const;
+  public:
+  void clear_table_names();
+  ::greptime::v1::TableName* mutable_table_names(int index);
+  ::PROTOBUF_NAMESPACE_ID::RepeatedPtrField< ::greptime::v1::TableName >*
+      mutable_table_names();
+  private:
+  const ::greptime::v1::TableName& _internal_table_names(int index) const;
+  ::greptime::v1::TableName* _internal_add_table_names();
+  public:
+  const ::greptime::v1::TableName& table_names(int index) const;
+  ::greptime::v1::TableName* add_table_names();
+  const ::PROTOBUF_NAMESPACE_ID::RepeatedPtrField< ::greptime::v1::TableName >&
+      table_names() const;
+
   // string catalog_name = 1;
   void clear_catalog_name();
   const std::string& catalog_name() const;
@@ -1282,6 +1301,7 @@ class CreateViewExpr final :
   typedef void InternalArenaConstructable_;
   typedef void DestructorSkippable_;
   struct Impl_ {
+    ::PROTOBUF_NAMESPACE_ID::RepeatedPtrField< ::greptime::v1::TableName > table_names_;
     ::PROTOBUF_NAMESPACE_ID::internal::ArenaStringPtr catalog_name_;
     ::PROTOBUF_NAMESPACE_ID::internal::ArenaStringPtr schema_name_;
     ::PROTOBUF_NAMESPACE_ID::internal::ArenaStringPtr view_name_;
@@ -6488,6 +6508,43 @@ inline void CreateViewExpr::set_or_replace(bool value) {
   // @@protoc_insertion_point(field_set:greptime.v1.CreateViewExpr.or_replace)
 }
 
+// repeated .greptime.v1.TableName table_names = 7;
+inline int CreateViewExpr::_internal_table_names_size() const {
+  return _impl_.table_names_.size();
+}
+inline int CreateViewExpr::table_names_size() const {
+  return _internal_table_names_size();
+}
+inline ::greptime::v1::TableName* CreateViewExpr::mutable_table_names(int index) {
+  // @@protoc_insertion_point(field_mutable:greptime.v1.CreateViewExpr.table_names)
+  return _impl_.table_names_.Mutable(index);
+}
+inline ::PROTOBUF_NAMESPACE_ID::RepeatedPtrField< ::greptime::v1::TableName >*
+CreateViewExpr::mutable_table_names() {
+  // @@protoc_insertion_point(field_mutable_list:greptime.v1.CreateViewExpr.table_names)
+  return &_impl_.table_names_;
+}
+inline const ::greptime::v1::TableName& CreateViewExpr::_internal_table_names(int index) const {
+  return _impl_.table_names_.Get(index);
+}
+inline const ::greptime::v1::TableName& CreateViewExpr::table_names(int index) const {
+  // @@protoc_insertion_point(field_get:greptime.v1.CreateViewExpr.table_names)
+  return _internal_table_names(index);
+}
+inline ::greptime::v1::TableName* CreateViewExpr::_internal_add_table_names() {
+  return _impl_.table_names_.Add();
+}
+inline ::greptime::v1::TableName* CreateViewExpr::add_table_names() {
+  ::greptime::v1::TableName* _add = _internal_add_table_names();
+  // @@protoc_insertion_point(field_add:greptime.v1.CreateViewExpr.table_names)
+  return _add;
+}
+inline const ::PROTOBUF_NAMESPACE_ID::RepeatedPtrField< ::greptime::v1::TableName >&
+CreateViewExpr::table_names() const {
+  // @@protoc_insertion_point(field_list:greptime.v1.CreateViewExpr.table_names)
+  return _impl_.table_names_;
+}
+
 // -------------------------------------------------------------------
 
 // DropViewExpr

c++/substrait_extension/dist_plan.grpc.pb.cc

@@ -0,0 +1,25 @@
+// Generated by the gRPC C++ plugin.
+// If you make any local change, they will be lost.
+// source: substrait_extension/dist_plan.proto
+
+#include "substrait_extension/dist_plan.pb.h"
+#include "substrait_extension/dist_plan.grpc.pb.h"
+
+#include <functional>
+#include <grpcpp/support/async_stream.h>
+#include <grpcpp/support/async_unary_call.h>
+#include <grpcpp/impl/channel_interface.h>
+#include <grpcpp/impl/client_unary_call.h>
+#include <grpcpp/support/client_callback.h>
+#include <grpcpp/support/message_allocator.h>
+#include <grpcpp/support/method_handler.h>
+#include <grpcpp/impl/rpc_service_method.h>
+#include <grpcpp/support/server_callback.h>
+#include <grpcpp/impl/codegen/server_callback_handlers.h>
+#include <grpcpp/server_context.h>
+#include <grpcpp/impl/service_type.h>
+#include <grpcpp/support/sync_stream.h>
+namespace substrait_extension {
+
+}  // namespace substrait_extension
+

c++/substrait_extension/dist_plan.grpc.pb.h

@@ -0,0 +1,48 @@
+// Generated by the gRPC C++ plugin.
+// If you make any local change, they will be lost.
+// source: substrait_extension/dist_plan.proto
+// Original file comments:
+// Copyright 2023 Greptime Team
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+#ifndef GRPC_substrait_5fextension_2fdist_5fplan_2eproto__INCLUDED
+#define GRPC_substrait_5fextension_2fdist_5fplan_2eproto__INCLUDED
+
+#include "substrait_extension/dist_plan.pb.h"
+
+#include <functional>
+#include <grpcpp/generic/async_generic_service.h>
+#include <grpcpp/support/async_stream.h>
+#include <grpcpp/support/async_unary_call.h>
+#include <grpcpp/support/client_callback.h>
+#include <grpcpp/client_context.h>
+#include <grpcpp/completion_queue.h>
+#include <grpcpp/support/message_allocator.h>
+#include <grpcpp/support/method_handler.h>
+#include <grpcpp/impl/codegen/proto_utils.h>
+#include <grpcpp/impl/rpc_method.h>
+#include <grpcpp/support/server_callback.h>
+#include <grpcpp/impl/codegen/server_callback_handlers.h>
+#include <grpcpp/server_context.h>
+#include <grpcpp/impl/service_type.h>
+#include <grpcpp/impl/codegen/status.h>
+#include <grpcpp/support/stub_options.h>
+#include <grpcpp/support/sync_stream.h>
+
+namespace substrait_extension {
+
+}  // namespace substrait_extension
+
+
+#endif  // GRPC_substrait_5fextension_2fdist_5fplan_2eproto__INCLUDED

c++/substrait_extension/dist_plan.pb.cc

@@ -0,0 +1,320 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: substrait_extension/dist_plan.proto
+
+#include "substrait_extension/dist_plan.pb.h"
+
+#include <algorithm>
+
+#include <google/protobuf/io/coded_stream.h>
+#include <google/protobuf/extension_set.h>
+#include <google/protobuf/wire_format_lite.h>
+#include <google/protobuf/descriptor.h>
+#include <google/protobuf/generated_message_reflection.h>
+#include <google/protobuf/reflection_ops.h>
+#include <google/protobuf/wire_format.h>
+// @@protoc_insertion_point(includes)
+#include <google/protobuf/port_def.inc>
+
+PROTOBUF_PRAGMA_INIT_SEG
+
+namespace _pb = ::PROTOBUF_NAMESPACE_ID;
+namespace _pbi = _pb::internal;
+
+namespace substrait_extension {
+PROTOBUF_CONSTEXPR MergeScan::MergeScan(
+    ::_pbi::ConstantInitialized): _impl_{
+    /*decltype(_impl_.input_)*/{&::_pbi::fixed_address_empty_string, ::_pbi::ConstantInitialized{}}
+  , /*decltype(_impl_.is_placeholder_)*/false
+  , /*decltype(_impl_._cached_size_)*/{}} {}
+struct MergeScanDefaultTypeInternal {
+  PROTOBUF_CONSTEXPR MergeScanDefaultTypeInternal()
+      : _instance(::_pbi::ConstantInitialized{}) {}
+  ~MergeScanDefaultTypeInternal() {}
+  union {
+    MergeScan _instance;
+  };
+};
+PROTOBUF_ATTRIBUTE_NO_DESTROY PROTOBUF_CONSTINIT PROTOBUF_ATTRIBUTE_INIT_PRIORITY1 MergeScanDefaultTypeInternal _MergeScan_default_instance_;
+}  // namespace substrait_extension
+static ::_pb::Metadata file_level_metadata_substrait_5fextension_2fdist_5fplan_2eproto[1];
+static constexpr ::_pb::EnumDescriptor const** file_level_enum_descriptors_substrait_5fextension_2fdist_5fplan_2eproto = nullptr;
+static constexpr ::_pb::ServiceDescriptor const** file_level_service_descriptors_substrait_5fextension_2fdist_5fplan_2eproto = nullptr;
+
+const uint32_t TableStruct_substrait_5fextension_2fdist_5fplan_2eproto::offsets[] PROTOBUF_SECTION_VARIABLE(protodesc_cold) = {
+  ~0u,  // no _has_bits_
+  PROTOBUF_FIELD_OFFSET(::substrait_extension::MergeScan, _internal_metadata_),
+  ~0u,  // no _extensions_
+  ~0u,  // no _oneof_case_
+  ~0u,  // no _weak_field_map_
+  ~0u,  // no _inlined_string_donated_
+  PROTOBUF_FIELD_OFFSET(::substrait_extension::MergeScan, _impl_.input_),
+  PROTOBUF_FIELD_OFFSET(::substrait_extension::MergeScan, _impl_.is_placeholder_),
+};
+static const ::_pbi::MigrationSchema schemas[] PROTOBUF_SECTION_VARIABLE(protodesc_cold) = {
+  { 0, -1, -1, sizeof(::substrait_extension::MergeScan)},
+};
+
+static const ::_pb::Message* const file_default_instances[] = {
+  &::substrait_extension::_MergeScan_default_instance_._instance,
+};
+
+const char descriptor_table_protodef_substrait_5fextension_2fdist_5fplan_2eproto[] PROTOBUF_SECTION_VARIABLE(protodesc_cold) =
+  "\n#substrait_extension/dist_plan.proto\022\023s"
+  "ubstrait_extension\"2\n\tMergeScan\022\r\n\005input"
+  "\030\001 \001(\014\022\026\n\016is_placeholder\030\002 \001(\010B\?Z=github"
+  ".com/GreptimeTeam/greptime-proto/go/subs"
+  "trait_extensionb\006proto3"
+  ;
+static ::_pbi::once_flag descriptor_table_substrait_5fextension_2fdist_5fplan_2eproto_once;
+const ::_pbi::DescriptorTable descriptor_table_substrait_5fextension_2fdist_5fplan_2eproto = {
+    false, false, 183, descriptor_table_protodef_substrait_5fextension_2fdist_5fplan_2eproto,
+    "substrait_extension/dist_plan.proto",
+    &descriptor_table_substrait_5fextension_2fdist_5fplan_2eproto_once, nullptr, 0, 1,
+    schemas, file_default_instances, TableStruct_substrait_5fextension_2fdist_5fplan_2eproto::offsets,
+    file_level_metadata_substrait_5fextension_2fdist_5fplan_2eproto, file_level_enum_descriptors_substrait_5fextension_2fdist_5fplan_2eproto,
+    file_level_service_descriptors_substrait_5fextension_2fdist_5fplan_2eproto,
+};
+PROTOBUF_ATTRIBUTE_WEAK const ::_pbi::DescriptorTable* descriptor_table_substrait_5fextension_2fdist_5fplan_2eproto_getter() {
+  return &descriptor_table_substrait_5fextension_2fdist_5fplan_2eproto;
+}
+
+// Force running AddDescriptors() at dynamic initialization time.
+PROTOBUF_ATTRIBUTE_INIT_PRIORITY2 static ::_pbi::AddDescriptorsRunner dynamic_init_dummy_substrait_5fextension_2fdist_5fplan_2eproto(&descriptor_table_substrait_5fextension_2fdist_5fplan_2eproto);
+namespace substrait_extension {
+
+// ===================================================================
+
+class MergeScan::_Internal {
+ public:
+};
+
+MergeScan::MergeScan(::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:substrait_extension.MergeScan)
+}
+MergeScan::MergeScan(const MergeScan& from)
+  : ::PROTOBUF_NAMESPACE_ID::Message() {
+  MergeScan* const _this = this; (void)_this;
+  new (&_impl_) Impl_{
+      decltype(_impl_.input_){}
+    , decltype(_impl_.is_placeholder_){}
+    , /*decltype(_impl_._cached_size_)*/{}};
+
+  _internal_metadata_.MergeFrom<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>(from._internal_metadata_);
+  _impl_.input_.InitDefault();
+  #ifdef PROTOBUF_FORCE_COPY_DEFAULT_STRING
+    _impl_.input_.Set("", GetArenaForAllocation());
+  #endif // PROTOBUF_FORCE_COPY_DEFAULT_STRING
+  if (!from._internal_input().empty()) {
+    _this->_impl_.input_.Set(from._internal_input(), 
+      _this->GetArenaForAllocation());
+  }
+  _this->_impl_.is_placeholder_ = from._impl_.is_placeholder_;
+  // @@protoc_insertion_point(copy_constructor:substrait_extension.MergeScan)
+}
+
+inline void MergeScan::SharedCtor(
+    ::_pb::Arena* arena, bool is_message_owned) {
+  (void)arena;
+  (void)is_message_owned;
+  new (&_impl_) Impl_{
+      decltype(_impl_.input_){}
+    , decltype(_impl_.is_placeholder_){false}
+    , /*decltype(_impl_._cached_size_)*/{}
+  };
+  _impl_.input_.InitDefault();
+  #ifdef PROTOBUF_FORCE_COPY_DEFAULT_STRING
+    _impl_.input_.Set("", GetArenaForAllocation());
+  #endif // PROTOBUF_FORCE_COPY_DEFAULT_STRING
+}
+
+MergeScan::~MergeScan() {
+  // @@protoc_insertion_point(destructor:substrait_extension.MergeScan)
+  if (auto *arena = _internal_metadata_.DeleteReturnArena<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>()) {
+  (void)arena;
+    return;
+  }
+  SharedDtor();
+}
+
+inline void MergeScan::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaForAllocation() == nullptr);
+  _impl_.input_.Destroy();
+}
+
+void MergeScan::SetCachedSize(int size) const {
+  _impl_._cached_size_.Set(size);
+}
+
+void MergeScan::Clear() {
+// @@protoc_insertion_point(message_clear_start:substrait_extension.MergeScan)
+  uint32_t cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
+  _impl_.input_.ClearToEmpty();
+  _impl_.is_placeholder_ = false;
+  _internal_metadata_.Clear<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>();
+}
+
+const char* MergeScan::_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) {
+      // bytes input = 1;
+      case 1:
+        if (PROTOBUF_PREDICT_TRUE(static_cast<uint8_t>(tag) == 10)) {
+          auto str = _internal_mutable_input();
+          ptr = ::_pbi::InlineGreedyStringParser(str, ptr, ctx);
+          CHK_(ptr);
+        } else
+          goto handle_unusual;
+        continue;
+      // bool is_placeholder = 2;
+      case 2:
+        if (PROTOBUF_PREDICT_TRUE(static_cast<uint8_t>(tag) == 16)) {
+          _impl_.is_placeholder_ = ::PROTOBUF_NAMESPACE_ID::internal::ReadVarint64(&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* MergeScan::_InternalSerialize(
+    uint8_t* target, ::PROTOBUF_NAMESPACE_ID::io::EpsCopyOutputStream* stream) const {
+  // @@protoc_insertion_point(serialize_to_array_start:substrait_extension.MergeScan)
+  uint32_t cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  // bytes input = 1;
+  if (!this->_internal_input().empty()) {
+    target = stream->WriteBytesMaybeAliased(
+        1, this->_internal_input(), target);
+  }
+
+  // bool is_placeholder = 2;
+  if (this->_internal_is_placeholder() != 0) {
+    target = stream->EnsureSpace(target);
+    target = ::_pbi::WireFormatLite::WriteBoolToArray(2, this->_internal_is_placeholder(), target);
+  }
+
+  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:substrait_extension.MergeScan)
+  return target;
+}
+
+size_t MergeScan::ByteSizeLong() const {
+// @@protoc_insertion_point(message_byte_size_start:substrait_extension.MergeScan)
+  size_t total_size = 0;
+
+  uint32_t cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
+  // bytes input = 1;
+  if (!this->_internal_input().empty()) {
+    total_size += 1 +
+      ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::BytesSize(
+        this->_internal_input());
+  }
+
+  // bool is_placeholder = 2;
+  if (this->_internal_is_placeholder() != 0) {
+    total_size += 1 + 1;
+  }
+
+  return MaybeComputeUnknownFieldsSize(total_size, &_impl_._cached_size_);
+}
+
+const ::PROTOBUF_NAMESPACE_ID::Message::ClassData MergeScan::_class_data_ = {
+    ::PROTOBUF_NAMESPACE_ID::Message::CopyWithSourceCheck,
+    MergeScan::MergeImpl
+};
+const ::PROTOBUF_NAMESPACE_ID::Message::ClassData*MergeScan::GetClassData() const { return &_class_data_; }
+
+
+void MergeScan::MergeImpl(::PROTOBUF_NAMESPACE_ID::Message& to_msg, const ::PROTOBUF_NAMESPACE_ID::Message& from_msg) {
+  auto* const _this = static_cast<MergeScan*>(&to_msg);
+  auto& from = static_cast<const MergeScan&>(from_msg);
+  // @@protoc_insertion_point(class_specific_merge_from_start:substrait_extension.MergeScan)
+  GOOGLE_DCHECK_NE(&from, _this);
+  uint32_t cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  if (!from._internal_input().empty()) {
+    _this->_internal_set_input(from._internal_input());
+  }
+  if (from._internal_is_placeholder() != 0) {
+    _this->_internal_set_is_placeholder(from._internal_is_placeholder());
+  }
+  _this->_internal_metadata_.MergeFrom<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>(from._internal_metadata_);
+}
+
+void MergeScan::CopyFrom(const MergeScan& from) {
+// @@protoc_insertion_point(class_specific_copy_from_start:substrait_extension.MergeScan)
+  if (&from == this) return;
+  Clear();
+  MergeFrom(from);
+}
+
+bool MergeScan::IsInitialized() const {
+  return true;
+}
+
+void MergeScan::InternalSwap(MergeScan* 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_.input_, lhs_arena,
+      &other->_impl_.input_, rhs_arena
+  );
+  swap(_impl_.is_placeholder_, other->_impl_.is_placeholder_);
+}
+
+::PROTOBUF_NAMESPACE_ID::Metadata MergeScan::GetMetadata() const {
+  return ::_pbi::AssignDescriptors(
+      &descriptor_table_substrait_5fextension_2fdist_5fplan_2eproto_getter, &descriptor_table_substrait_5fextension_2fdist_5fplan_2eproto_once,
+      file_level_metadata_substrait_5fextension_2fdist_5fplan_2eproto[0]);
+}
+
+// @@protoc_insertion_point(namespace_scope)
+}  // namespace substrait_extension
+PROTOBUF_NAMESPACE_OPEN
+template<> PROTOBUF_NOINLINE ::substrait_extension::MergeScan*
+Arena::CreateMaybeMessage< ::substrait_extension::MergeScan >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::substrait_extension::MergeScan >(arena);
+}
+PROTOBUF_NAMESPACE_CLOSE
+
+// @@protoc_insertion_point(global_scope)
+#include <google/protobuf/port_undef.inc>

c++/substrait_extension/dist_plan.pb.h

@@ -0,0 +1,313 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: substrait_extension/dist_plan.proto
+
+#ifndef GOOGLE_PROTOBUF_INCLUDED_substrait_5fextension_2fdist_5fplan_2eproto
+#define GOOGLE_PROTOBUF_INCLUDED_substrait_5fextension_2fdist_5fplan_2eproto
+
+#include <limits>
+#include <string>
+
+#include <google/protobuf/port_def.inc>
+#if PROTOBUF_VERSION < 3021000
+#error This file was generated by a newer version of protoc which is
+#error incompatible with your Protocol Buffer headers. Please update
+#error your headers.
+#endif
+#if 3021006 < PROTOBUF_MIN_PROTOC_VERSION
+#error This file was generated by an older version of protoc which is
+#error incompatible with your Protocol Buffer headers. Please
+#error regenerate this file with a newer version of protoc.
+#endif
+
+#include <google/protobuf/port_undef.inc>
+#include <google/protobuf/io/coded_stream.h>
+#include <google/protobuf/arena.h>
+#include <google/protobuf/arenastring.h>
+#include <google/protobuf/generated_message_util.h>
+#include <google/protobuf/metadata_lite.h>
+#include <google/protobuf/generated_message_reflection.h>
+#include <google/protobuf/message.h>
+#include <google/protobuf/repeated_field.h>  // IWYU pragma: export
+#include <google/protobuf/extension_set.h>  // IWYU pragma: export
+#include <google/protobuf/unknown_field_set.h>
+// @@protoc_insertion_point(includes)
+#include <google/protobuf/port_def.inc>
+#define PROTOBUF_INTERNAL_EXPORT_substrait_5fextension_2fdist_5fplan_2eproto
+PROTOBUF_NAMESPACE_OPEN
+namespace internal {
+class AnyMetadata;
+}  // namespace internal
+PROTOBUF_NAMESPACE_CLOSE
+
+// Internal implementation detail -- do not use these members.
+struct TableStruct_substrait_5fextension_2fdist_5fplan_2eproto {
+  static const uint32_t offsets[];
+};
+extern const ::PROTOBUF_NAMESPACE_ID::internal::DescriptorTable descriptor_table_substrait_5fextension_2fdist_5fplan_2eproto;
+namespace substrait_extension {
+class MergeScan;
+struct MergeScanDefaultTypeInternal;
+extern MergeScanDefaultTypeInternal _MergeScan_default_instance_;
+}  // namespace substrait_extension
+PROTOBUF_NAMESPACE_OPEN
+template<> ::substrait_extension::MergeScan* Arena::CreateMaybeMessage<::substrait_extension::MergeScan>(Arena*);
+PROTOBUF_NAMESPACE_CLOSE
+namespace substrait_extension {
+
+// ===================================================================
+
+class MergeScan final :
+    public ::PROTOBUF_NAMESPACE_ID::Message /* @@protoc_insertion_point(class_definition:substrait_extension.MergeScan) */ {
+ public:
+  inline MergeScan() : MergeScan(nullptr) {}
+  ~MergeScan() override;
+  explicit PROTOBUF_CONSTEXPR MergeScan(::PROTOBUF_NAMESPACE_ID::internal::ConstantInitialized);
+
+  MergeScan(const MergeScan& from);
+  MergeScan(MergeScan&& from) noexcept
+    : MergeScan() {
+    *this = ::std::move(from);
+  }
+
+  inline MergeScan& operator=(const MergeScan& from) {
+    CopyFrom(from);
+    return *this;
+  }
+  inline MergeScan& operator=(MergeScan&& 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 MergeScan& default_instance() {
+    return *internal_default_instance();
+  }
+  static inline const MergeScan* internal_default_instance() {
+    return reinterpret_cast<const MergeScan*>(
+               &_MergeScan_default_instance_);
+  }
+  static constexpr int kIndexInFileMessages =
+    0;
+
+  friend void swap(MergeScan& a, MergeScan& b) {
+    a.Swap(&b);
+  }
+  inline void Swap(MergeScan* 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(MergeScan* other) {
+    if (other == this) return;
+    GOOGLE_DCHECK(GetOwningArena() == other->GetOwningArena());
+    InternalSwap(other);
+  }
+
+  // implements Message ----------------------------------------------
+
+  MergeScan* New(::PROTOBUF_NAMESPACE_ID::Arena* arena = nullptr) const final {
+    return CreateMaybeMessage<MergeScan>(arena);
+  }
+  using ::PROTOBUF_NAMESPACE_ID::Message::CopyFrom;
+  void CopyFrom(const MergeScan& from);
+  using ::PROTOBUF_NAMESPACE_ID::Message::MergeFrom;
+  void MergeFrom( const MergeScan& from) {
+    MergeScan::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(MergeScan* other);
+
+  private:
+  friend class ::PROTOBUF_NAMESPACE_ID::internal::AnyMetadata;
+  static ::PROTOBUF_NAMESPACE_ID::StringPiece FullMessageName() {
+    return "substrait_extension.MergeScan";
+  }
+  protected:
+  explicit MergeScan(::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 {
+    kInputFieldNumber = 1,
+    kIsPlaceholderFieldNumber = 2,
+  };
+  // bytes input = 1;
+  void clear_input();
+  const std::string& input() const;
+  template <typename ArgT0 = const std::string&, typename... ArgT>
+  void set_input(ArgT0&& arg0, ArgT... args);
+  std::string* mutable_input();
+  PROTOBUF_NODISCARD std::string* release_input();
+  void set_allocated_input(std::string* input);
+  private:
+  const std::string& _internal_input() const;
+  inline PROTOBUF_ALWAYS_INLINE void _internal_set_input(const std::string& value);
+  std::string* _internal_mutable_input();
+  public:
+
+  // bool is_placeholder = 2;
+  void clear_is_placeholder();
+  bool is_placeholder() const;
+  void set_is_placeholder(bool value);
+  private:
+  bool _internal_is_placeholder() const;
+  void _internal_set_is_placeholder(bool value);
+  public:
+
+  // @@protoc_insertion_point(class_scope:substrait_extension.MergeScan)
+ 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 input_;
+    bool is_placeholder_;
+    mutable ::PROTOBUF_NAMESPACE_ID::internal::CachedSize _cached_size_;
+  };
+  union { Impl_ _impl_; };
+  friend struct ::TableStruct_substrait_5fextension_2fdist_5fplan_2eproto;
+};
+// ===================================================================
+
+
+// ===================================================================
+
+#ifdef __GNUC__
+  #pragma GCC diagnostic push
+  #pragma GCC diagnostic ignored "-Wstrict-aliasing"
+#endif  // __GNUC__
+// MergeScan
+
+// bytes input = 1;
+inline void MergeScan::clear_input() {
+  _impl_.input_.ClearToEmpty();
+}
+inline const std::string& MergeScan::input() const {
+  // @@protoc_insertion_point(field_get:substrait_extension.MergeScan.input)
+  return _internal_input();
+}
+template <typename ArgT0, typename... ArgT>
+inline PROTOBUF_ALWAYS_INLINE
+void MergeScan::set_input(ArgT0&& arg0, ArgT... args) {
+ 
+ _impl_.input_.SetBytes(static_cast<ArgT0 &&>(arg0), args..., GetArenaForAllocation());
+  // @@protoc_insertion_point(field_set:substrait_extension.MergeScan.input)
+}
+inline std::string* MergeScan::mutable_input() {
+  std::string* _s = _internal_mutable_input();
+  // @@protoc_insertion_point(field_mutable:substrait_extension.MergeScan.input)
+  return _s;
+}
+inline const std::string& MergeScan::_internal_input() const {
+  return _impl_.input_.Get();
+}
+inline void MergeScan::_internal_set_input(const std::string& value) {
+  
+  _impl_.input_.Set(value, GetArenaForAllocation());
+}
+inline std::string* MergeScan::_internal_mutable_input() {
+  
+  return _impl_.input_.Mutable(GetArenaForAllocation());
+}
+inline std::string* MergeScan::release_input() {
+  // @@protoc_insertion_point(field_release:substrait_extension.MergeScan.input)
+  return _impl_.input_.Release();
+}
+inline void MergeScan::set_allocated_input(std::string* input) {
+  if (input != nullptr) {
+    
+  } else {
+    
+  }
+  _impl_.input_.SetAllocated(input, GetArenaForAllocation());
+#ifdef PROTOBUF_FORCE_COPY_DEFAULT_STRING
+  if (_impl_.input_.IsDefault()) {
+    _impl_.input_.Set("", GetArenaForAllocation());
+  }
+#endif // PROTOBUF_FORCE_COPY_DEFAULT_STRING
+  // @@protoc_insertion_point(field_set_allocated:substrait_extension.MergeScan.input)
+}
+
+// bool is_placeholder = 2;
+inline void MergeScan::clear_is_placeholder() {
+  _impl_.is_placeholder_ = false;
+}
+inline bool MergeScan::_internal_is_placeholder() const {
+  return _impl_.is_placeholder_;
+}
+inline bool MergeScan::is_placeholder() const {
+  // @@protoc_insertion_point(field_get:substrait_extension.MergeScan.is_placeholder)
+  return _internal_is_placeholder();
+}
+inline void MergeScan::_internal_set_is_placeholder(bool value) {
+  
+  _impl_.is_placeholder_ = value;
+}
+inline void MergeScan::set_is_placeholder(bool value) {
+  _internal_set_is_placeholder(value);
+  // @@protoc_insertion_point(field_set:substrait_extension.MergeScan.is_placeholder)
+}
+
+#ifdef __GNUC__
+  #pragma GCC diagnostic pop
+#endif  // __GNUC__
+
+// @@protoc_insertion_point(namespace_scope)
+
+}  // namespace substrait_extension
+
+// @@protoc_insertion_point(global_scope)
+
+#include <google/protobuf/port_undef.inc>
+#endif  // GOOGLE_PROTOBUF_INCLUDED_GOOGLE_PROTOBUF_INCLUDED_substrait_5fextension_2fdist_5fplan_2eproto