feat: define CommentOn task (#295)

Signed-off-by: Ruihang Xia <waynestxia@gmail.com>
Co-authored-by: Ruihang Xia <waynestxia@gmail.com>

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

@@ -70,6 +70,9 @@ extern AlterTableExprDefaultTypeInternal _AlterTableExpr_default_instance_;
 class ColumnDef;
 struct ColumnDefDefaultTypeInternal;
 extern ColumnDefDefaultTypeInternal _ColumnDef_default_instance_;
+class CommentOnExpr;
+struct CommentOnExprDefaultTypeInternal;
+extern CommentOnExprDefaultTypeInternal _CommentOnExpr_default_instance_;
 class CreateDatabaseExpr;
 struct CreateDatabaseExprDefaultTypeInternal;
 extern CreateDatabaseExprDefaultTypeInternal _CreateDatabaseExpr_default_instance_;
@@ -217,6 +220,7 @@ template<> ::greptime::v1::AddColumns* Arena::CreateMaybeMessage<::greptime::v1:
 template<> ::greptime::v1::AlterDatabaseExpr* Arena::CreateMaybeMessage<::greptime::v1::AlterDatabaseExpr>(Arena*);
 template<> ::greptime::v1::AlterTableExpr* Arena::CreateMaybeMessage<::greptime::v1::AlterTableExpr>(Arena*);
 template<> ::greptime::v1::ColumnDef* Arena::CreateMaybeMessage<::greptime::v1::ColumnDef>(Arena*);
+template<> ::greptime::v1::CommentOnExpr* Arena::CreateMaybeMessage<::greptime::v1::CommentOnExpr>(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*);
 template<> ::greptime::v1::CreateFlowExpr* Arena::CreateMaybeMessage<::greptime::v1::CreateFlowExpr>(Arena*);
@@ -366,6 +370,32 @@ inline bool SkippingIndexType_Parse(
   return ::PROTOBUF_NAMESPACE_ID::internal::ParseNamedEnum<SkippingIndexType>(
     SkippingIndexType_descriptor(), name, value);
 }
+enum CommentObjectType : int {
+  TABLE = 0,
+  COLUMN = 1,
+  FLOW = 2,
+  CommentObjectType_INT_MIN_SENTINEL_DO_NOT_USE_ = std::numeric_limits<int32_t>::min(),
+  CommentObjectType_INT_MAX_SENTINEL_DO_NOT_USE_ = std::numeric_limits<int32_t>::max()
+};
+bool CommentObjectType_IsValid(int value);
+constexpr CommentObjectType CommentObjectType_MIN = TABLE;
+constexpr CommentObjectType CommentObjectType_MAX = FLOW;
+constexpr int CommentObjectType_ARRAYSIZE = CommentObjectType_MAX + 1;
+
+const ::PROTOBUF_NAMESPACE_ID::EnumDescriptor* CommentObjectType_descriptor();
+template<typename T>
+inline const std::string& CommentObjectType_Name(T enum_t_value) {
+  static_assert(::std::is_same<T, CommentObjectType>::value ||
+    ::std::is_integral<T>::value,
+    "Incorrect type passed to function CommentObjectType_Name.");
+  return ::PROTOBUF_NAMESPACE_ID::internal::NameOfEnum(
+    CommentObjectType_descriptor(), enum_t_value);
+}
+inline bool CommentObjectType_Parse(
+    ::PROTOBUF_NAMESPACE_ID::ConstStringParam name, CommentObjectType* value) {
+  return ::PROTOBUF_NAMESPACE_ID::internal::ParseNamedEnum<CommentObjectType>(
+    CommentObjectType_descriptor(), name, value);
+}
 // ===================================================================
 
 class DdlRequest final :
@@ -422,6 +452,7 @@ class DdlRequest final :
     kCreateView = 10,
     kDropView = 11,
     kAlterDatabase = 12,
+    kCommentOn = 13,
     EXPR_NOT_SET = 0,
   };
 
@@ -513,6 +544,7 @@ class DdlRequest final :
     kCreateViewFieldNumber = 10,
     kDropViewFieldNumber = 11,
     kAlterDatabaseFieldNumber = 12,
+    kCommentOnFieldNumber = 13,
   };
   // .greptime.v1.CreateDatabaseExpr create_database = 1;
   bool has_create_database() const;
@@ -694,6 +726,24 @@ class DdlRequest final :
       ::greptime::v1::AlterDatabaseExpr* alter_database);
   ::greptime::v1::AlterDatabaseExpr* unsafe_arena_release_alter_database();
 
+  // .greptime.v1.CommentOnExpr comment_on = 13;
+  bool has_comment_on() const;
+  private:
+  bool _internal_has_comment_on() const;
+  public:
+  void clear_comment_on();
+  const ::greptime::v1::CommentOnExpr& comment_on() const;
+  PROTOBUF_NODISCARD ::greptime::v1::CommentOnExpr* release_comment_on();
+  ::greptime::v1::CommentOnExpr* mutable_comment_on();
+  void set_allocated_comment_on(::greptime::v1::CommentOnExpr* comment_on);
+  private:
+  const ::greptime::v1::CommentOnExpr& _internal_comment_on() const;
+  ::greptime::v1::CommentOnExpr* _internal_mutable_comment_on();
+  public:
+  void unsafe_arena_set_allocated_comment_on(
+      ::greptime::v1::CommentOnExpr* comment_on);
+  ::greptime::v1::CommentOnExpr* unsafe_arena_release_comment_on();
+
   void clear_expr();
   ExprCase expr_case() const;
   // @@protoc_insertion_point(class_scope:greptime.v1.DdlRequest)
@@ -709,6 +759,7 @@ class DdlRequest final :
   void set_has_create_view();
   void set_has_drop_view();
   void set_has_alter_database();
+  void set_has_comment_on();
 
   inline bool has_expr() const;
   inline void clear_has_expr();
@@ -730,6 +781,7 @@ class DdlRequest final :
       ::greptime::v1::CreateViewExpr* create_view_;
       ::greptime::v1::DropViewExpr* drop_view_;
       ::greptime::v1::AlterDatabaseExpr* alter_database_;
+      ::greptime::v1::CommentOnExpr* comment_on_;
     } expr_;
     mutable ::PROTOBUF_NAMESPACE_ID::internal::CachedSize _cached_size_;
     uint32_t _oneof_case_[1];
@@ -9859,6 +9911,234 @@ class DropTriggerExpr final :
   union { Impl_ _impl_; };
   friend struct ::TableStruct_greptime_2fv1_2fddl_2eproto;
 };
+// -------------------------------------------------------------------
+
+class CommentOnExpr final :
+    public ::PROTOBUF_NAMESPACE_ID::Message /* @@protoc_insertion_point(class_definition:greptime.v1.CommentOnExpr) */ {
+ public:
+  inline CommentOnExpr() : CommentOnExpr(nullptr) {}
+  ~CommentOnExpr() override;
+  explicit PROTOBUF_CONSTEXPR CommentOnExpr(::PROTOBUF_NAMESPACE_ID::internal::ConstantInitialized);
+
+  CommentOnExpr(const CommentOnExpr& from);
+  CommentOnExpr(CommentOnExpr&& from) noexcept
+    : CommentOnExpr() {
+    *this = ::std::move(from);
+  }
+
+  inline CommentOnExpr& operator=(const CommentOnExpr& from) {
+    CopyFrom(from);
+    return *this;
+  }
+  inline CommentOnExpr& operator=(CommentOnExpr&& 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 CommentOnExpr& default_instance() {
+    return *internal_default_instance();
+  }
+  static inline const CommentOnExpr* internal_default_instance() {
+    return reinterpret_cast<const CommentOnExpr*>(
+               &_CommentOnExpr_default_instance_);
+  }
+  static constexpr int kIndexInFileMessages =
+    52;
+
+  friend void swap(CommentOnExpr& a, CommentOnExpr& b) {
+    a.Swap(&b);
+  }
+  inline void Swap(CommentOnExpr* 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(CommentOnExpr* other) {
+    if (other == this) return;
+    GOOGLE_DCHECK(GetOwningArena() == other->GetOwningArena());
+    InternalSwap(other);
+  }
+
+  // implements Message ----------------------------------------------
+
+  CommentOnExpr* New(::PROTOBUF_NAMESPACE_ID::Arena* arena = nullptr) const final {
+    return CreateMaybeMessage<CommentOnExpr>(arena);
+  }
+  using ::PROTOBUF_NAMESPACE_ID::Message::CopyFrom;
+  void CopyFrom(const CommentOnExpr& from);
+  using ::PROTOBUF_NAMESPACE_ID::Message::MergeFrom;
+  void MergeFrom( const CommentOnExpr& from) {
+    CommentOnExpr::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(CommentOnExpr* other);
+
+  private:
+  friend class ::PROTOBUF_NAMESPACE_ID::internal::AnyMetadata;
+  static ::PROTOBUF_NAMESPACE_ID::StringPiece FullMessageName() {
+    return "greptime.v1.CommentOnExpr";
+  }
+  protected:
+  explicit CommentOnExpr(::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 {
+    kCatalogNameFieldNumber = 1,
+    kSchemaNameFieldNumber = 2,
+    kObjectNameFieldNumber = 4,
+    kColumnNameFieldNumber = 5,
+    kCommentFieldNumber = 6,
+    kObjectTypeFieldNumber = 3,
+  };
+  // string catalog_name = 1;
+  void clear_catalog_name();
+  const std::string& catalog_name() const;
+  template <typename ArgT0 = const std::string&, typename... ArgT>
+  void set_catalog_name(ArgT0&& arg0, ArgT... args);
+  std::string* mutable_catalog_name();
+  PROTOBUF_NODISCARD std::string* release_catalog_name();
+  void set_allocated_catalog_name(std::string* catalog_name);
+  private:
+  const std::string& _internal_catalog_name() const;
+  inline PROTOBUF_ALWAYS_INLINE void _internal_set_catalog_name(const std::string& value);
+  std::string* _internal_mutable_catalog_name();
+  public:
+
+  // string schema_name = 2;
+  void clear_schema_name();
+  const std::string& schema_name() const;
+  template <typename ArgT0 = const std::string&, typename... ArgT>
+  void set_schema_name(ArgT0&& arg0, ArgT... args);
+  std::string* mutable_schema_name();
+  PROTOBUF_NODISCARD std::string* release_schema_name();
+  void set_allocated_schema_name(std::string* schema_name);
+  private:
+  const std::string& _internal_schema_name() const;
+  inline PROTOBUF_ALWAYS_INLINE void _internal_set_schema_name(const std::string& value);
+  std::string* _internal_mutable_schema_name();
+  public:
+
+  // string object_name = 4;
+  void clear_object_name();
+  const std::string& object_name() const;
+  template <typename ArgT0 = const std::string&, typename... ArgT>
+  void set_object_name(ArgT0&& arg0, ArgT... args);
+  std::string* mutable_object_name();
+  PROTOBUF_NODISCARD std::string* release_object_name();
+  void set_allocated_object_name(std::string* object_name);
+  private:
+  const std::string& _internal_object_name() const;
+  inline PROTOBUF_ALWAYS_INLINE void _internal_set_object_name(const std::string& value);
+  std::string* _internal_mutable_object_name();
+  public:
+
+  // string column_name = 5;
+  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:
+
+  // string comment = 6;
+  void clear_comment();
+  const std::string& comment() const;
+  template <typename ArgT0 = const std::string&, typename... ArgT>
+  void set_comment(ArgT0&& arg0, ArgT... args);
+  std::string* mutable_comment();
+  PROTOBUF_NODISCARD std::string* release_comment();
+  void set_allocated_comment(std::string* comment);
+  private:
+  const std::string& _internal_comment() const;
+  inline PROTOBUF_ALWAYS_INLINE void _internal_set_comment(const std::string& value);
+  std::string* _internal_mutable_comment();
+  public:
+
+  // .greptime.v1.CommentObjectType object_type = 3;
+  void clear_object_type();
+  ::greptime::v1::CommentObjectType object_type() const;
+  void set_object_type(::greptime::v1::CommentObjectType value);
+  private:
+  ::greptime::v1::CommentObjectType _internal_object_type() const;
+  void _internal_set_object_type(::greptime::v1::CommentObjectType value);
+  public:
+
+  // @@protoc_insertion_point(class_scope:greptime.v1.CommentOnExpr)
+ 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 catalog_name_;
+    ::PROTOBUF_NAMESPACE_ID::internal::ArenaStringPtr schema_name_;
+    ::PROTOBUF_NAMESPACE_ID::internal::ArenaStringPtr object_name_;
+    ::PROTOBUF_NAMESPACE_ID::internal::ArenaStringPtr column_name_;
+    ::PROTOBUF_NAMESPACE_ID::internal::ArenaStringPtr comment_;
+    int object_type_;
+    mutable ::PROTOBUF_NAMESPACE_ID::internal::CachedSize _cached_size_;
+  };
+  union { Impl_ _impl_; };
+  friend struct ::TableStruct_greptime_2fv1_2fddl_2eproto;
+};
 // ===================================================================
 
 
@@ -10610,6 +10890,80 @@ inline ::greptime::v1::AlterDatabaseExpr* DdlRequest::mutable_alter_database() {
   return _msg;
 }
 
+// .greptime.v1.CommentOnExpr comment_on = 13;
+inline bool DdlRequest::_internal_has_comment_on() const {
+  return expr_case() == kCommentOn;
+}
+inline bool DdlRequest::has_comment_on() const {
+  return _internal_has_comment_on();
+}
+inline void DdlRequest::set_has_comment_on() {
+  _impl_._oneof_case_[0] = kCommentOn;
+}
+inline void DdlRequest::clear_comment_on() {
+  if (_internal_has_comment_on()) {
+    if (GetArenaForAllocation() == nullptr) {
+      delete _impl_.expr_.comment_on_;
+    }
+    clear_has_expr();
+  }
+}
+inline ::greptime::v1::CommentOnExpr* DdlRequest::release_comment_on() {
+  // @@protoc_insertion_point(field_release:greptime.v1.DdlRequest.comment_on)
+  if (_internal_has_comment_on()) {
+    clear_has_expr();
+    ::greptime::v1::CommentOnExpr* temp = _impl_.expr_.comment_on_;
+    if (GetArenaForAllocation() != nullptr) {
+      temp = ::PROTOBUF_NAMESPACE_ID::internal::DuplicateIfNonNull(temp);
+    }
+    _impl_.expr_.comment_on_ = nullptr;
+    return temp;
+  } else {
+    return nullptr;
+  }
+}
+inline const ::greptime::v1::CommentOnExpr& DdlRequest::_internal_comment_on() const {
+  return _internal_has_comment_on()
+      ? *_impl_.expr_.comment_on_
+      : reinterpret_cast< ::greptime::v1::CommentOnExpr&>(::greptime::v1::_CommentOnExpr_default_instance_);
+}
+inline const ::greptime::v1::CommentOnExpr& DdlRequest::comment_on() const {
+  // @@protoc_insertion_point(field_get:greptime.v1.DdlRequest.comment_on)
+  return _internal_comment_on();
+}
+inline ::greptime::v1::CommentOnExpr* DdlRequest::unsafe_arena_release_comment_on() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:greptime.v1.DdlRequest.comment_on)
+  if (_internal_has_comment_on()) {
+    clear_has_expr();
+    ::greptime::v1::CommentOnExpr* temp = _impl_.expr_.comment_on_;
+    _impl_.expr_.comment_on_ = nullptr;
+    return temp;
+  } else {
+    return nullptr;
+  }
+}
+inline void DdlRequest::unsafe_arena_set_allocated_comment_on(::greptime::v1::CommentOnExpr* comment_on) {
+  clear_expr();
+  if (comment_on) {
+    set_has_comment_on();
+    _impl_.expr_.comment_on_ = comment_on;
+  }
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:greptime.v1.DdlRequest.comment_on)
+}
+inline ::greptime::v1::CommentOnExpr* DdlRequest::_internal_mutable_comment_on() {
+  if (!_internal_has_comment_on()) {
+    clear_expr();
+    set_has_comment_on();
+    _impl_.expr_.comment_on_ = CreateMaybeMessage< ::greptime::v1::CommentOnExpr >(GetArenaForAllocation());
+  }
+  return _impl_.expr_.comment_on_;
+}
+inline ::greptime::v1::CommentOnExpr* DdlRequest::mutable_comment_on() {
+  ::greptime::v1::CommentOnExpr* _msg = _internal_mutable_comment_on();
+  // @@protoc_insertion_point(field_mutable:greptime.v1.DdlRequest.comment_on)
+  return _msg;
+}
+
 inline bool DdlRequest::has_expr() const {
   return expr_case() != EXPR_NOT_SET;
 }
@@ -18703,6 +19057,280 @@ inline void DropTriggerExpr::set_drop_if_exists(bool value) {
   // @@protoc_insertion_point(field_set:greptime.v1.DropTriggerExpr.drop_if_exists)
 }
 
+// -------------------------------------------------------------------
+
+// CommentOnExpr
+
+// string catalog_name = 1;
+inline void CommentOnExpr::clear_catalog_name() {
+  _impl_.catalog_name_.ClearToEmpty();
+}
+inline const std::string& CommentOnExpr::catalog_name() const {
+  // @@protoc_insertion_point(field_get:greptime.v1.CommentOnExpr.catalog_name)
+  return _internal_catalog_name();
+}
+template <typename ArgT0, typename... ArgT>
+inline PROTOBUF_ALWAYS_INLINE
+void CommentOnExpr::set_catalog_name(ArgT0&& arg0, ArgT... args) {
+ 
+ _impl_.catalog_name_.Set(static_cast<ArgT0 &&>(arg0), args..., GetArenaForAllocation());
+  // @@protoc_insertion_point(field_set:greptime.v1.CommentOnExpr.catalog_name)
+}
+inline std::string* CommentOnExpr::mutable_catalog_name() {
+  std::string* _s = _internal_mutable_catalog_name();
+  // @@protoc_insertion_point(field_mutable:greptime.v1.CommentOnExpr.catalog_name)
+  return _s;
+}
+inline const std::string& CommentOnExpr::_internal_catalog_name() const {
+  return _impl_.catalog_name_.Get();
+}
+inline void CommentOnExpr::_internal_set_catalog_name(const std::string& value) {
+  
+  _impl_.catalog_name_.Set(value, GetArenaForAllocation());
+}
+inline std::string* CommentOnExpr::_internal_mutable_catalog_name() {
+  
+  return _impl_.catalog_name_.Mutable(GetArenaForAllocation());
+}
+inline std::string* CommentOnExpr::release_catalog_name() {
+  // @@protoc_insertion_point(field_release:greptime.v1.CommentOnExpr.catalog_name)
+  return _impl_.catalog_name_.Release();
+}
+inline void CommentOnExpr::set_allocated_catalog_name(std::string* catalog_name) {
+  if (catalog_name != nullptr) {
+    
+  } else {
+    
+  }
+  _impl_.catalog_name_.SetAllocated(catalog_name, GetArenaForAllocation());
+#ifdef PROTOBUF_FORCE_COPY_DEFAULT_STRING
+  if (_impl_.catalog_name_.IsDefault()) {
+    _impl_.catalog_name_.Set("", GetArenaForAllocation());
+  }
+#endif // PROTOBUF_FORCE_COPY_DEFAULT_STRING
+  // @@protoc_insertion_point(field_set_allocated:greptime.v1.CommentOnExpr.catalog_name)
+}
+
+// string schema_name = 2;
+inline void CommentOnExpr::clear_schema_name() {
+  _impl_.schema_name_.ClearToEmpty();
+}
+inline const std::string& CommentOnExpr::schema_name() const {
+  // @@protoc_insertion_point(field_get:greptime.v1.CommentOnExpr.schema_name)
+  return _internal_schema_name();
+}
+template <typename ArgT0, typename... ArgT>
+inline PROTOBUF_ALWAYS_INLINE
+void CommentOnExpr::set_schema_name(ArgT0&& arg0, ArgT... args) {
+ 
+ _impl_.schema_name_.Set(static_cast<ArgT0 &&>(arg0), args..., GetArenaForAllocation());
+  // @@protoc_insertion_point(field_set:greptime.v1.CommentOnExpr.schema_name)
+}
+inline std::string* CommentOnExpr::mutable_schema_name() {
+  std::string* _s = _internal_mutable_schema_name();
+  // @@protoc_insertion_point(field_mutable:greptime.v1.CommentOnExpr.schema_name)
+  return _s;
+}
+inline const std::string& CommentOnExpr::_internal_schema_name() const {
+  return _impl_.schema_name_.Get();
+}
+inline void CommentOnExpr::_internal_set_schema_name(const std::string& value) {
+  
+  _impl_.schema_name_.Set(value, GetArenaForAllocation());
+}
+inline std::string* CommentOnExpr::_internal_mutable_schema_name() {
+  
+  return _impl_.schema_name_.Mutable(GetArenaForAllocation());
+}
+inline std::string* CommentOnExpr::release_schema_name() {
+  // @@protoc_insertion_point(field_release:greptime.v1.CommentOnExpr.schema_name)
+  return _impl_.schema_name_.Release();
+}
+inline void CommentOnExpr::set_allocated_schema_name(std::string* schema_name) {
+  if (schema_name != nullptr) {
+    
+  } else {
+    
+  }
+  _impl_.schema_name_.SetAllocated(schema_name, GetArenaForAllocation());
+#ifdef PROTOBUF_FORCE_COPY_DEFAULT_STRING
+  if (_impl_.schema_name_.IsDefault()) {
+    _impl_.schema_name_.Set("", GetArenaForAllocation());
+  }
+#endif // PROTOBUF_FORCE_COPY_DEFAULT_STRING
+  // @@protoc_insertion_point(field_set_allocated:greptime.v1.CommentOnExpr.schema_name)
+}
+
+// .greptime.v1.CommentObjectType object_type = 3;
+inline void CommentOnExpr::clear_object_type() {
+  _impl_.object_type_ = 0;
+}
+inline ::greptime::v1::CommentObjectType CommentOnExpr::_internal_object_type() const {
+  return static_cast< ::greptime::v1::CommentObjectType >(_impl_.object_type_);
+}
+inline ::greptime::v1::CommentObjectType CommentOnExpr::object_type() const {
+  // @@protoc_insertion_point(field_get:greptime.v1.CommentOnExpr.object_type)
+  return _internal_object_type();
+}
+inline void CommentOnExpr::_internal_set_object_type(::greptime::v1::CommentObjectType value) {
+  
+  _impl_.object_type_ = value;
+}
+inline void CommentOnExpr::set_object_type(::greptime::v1::CommentObjectType value) {
+  _internal_set_object_type(value);
+  // @@protoc_insertion_point(field_set:greptime.v1.CommentOnExpr.object_type)
+}
+
+// string object_name = 4;
+inline void CommentOnExpr::clear_object_name() {
+  _impl_.object_name_.ClearToEmpty();
+}
+inline const std::string& CommentOnExpr::object_name() const {
+  // @@protoc_insertion_point(field_get:greptime.v1.CommentOnExpr.object_name)
+  return _internal_object_name();
+}
+template <typename ArgT0, typename... ArgT>
+inline PROTOBUF_ALWAYS_INLINE
+void CommentOnExpr::set_object_name(ArgT0&& arg0, ArgT... args) {
+ 
+ _impl_.object_name_.Set(static_cast<ArgT0 &&>(arg0), args..., GetArenaForAllocation());
+  // @@protoc_insertion_point(field_set:greptime.v1.CommentOnExpr.object_name)
+}
+inline std::string* CommentOnExpr::mutable_object_name() {
+  std::string* _s = _internal_mutable_object_name();
+  // @@protoc_insertion_point(field_mutable:greptime.v1.CommentOnExpr.object_name)
+  return _s;
+}
+inline const std::string& CommentOnExpr::_internal_object_name() const {
+  return _impl_.object_name_.Get();
+}
+inline void CommentOnExpr::_internal_set_object_name(const std::string& value) {
+  
+  _impl_.object_name_.Set(value, GetArenaForAllocation());
+}
+inline std::string* CommentOnExpr::_internal_mutable_object_name() {
+  
+  return _impl_.object_name_.Mutable(GetArenaForAllocation());
+}
+inline std::string* CommentOnExpr::release_object_name() {
+  // @@protoc_insertion_point(field_release:greptime.v1.CommentOnExpr.object_name)
+  return _impl_.object_name_.Release();
+}
+inline void CommentOnExpr::set_allocated_object_name(std::string* object_name) {
+  if (object_name != nullptr) {
+    
+  } else {
+    
+  }
+  _impl_.object_name_.SetAllocated(object_name, GetArenaForAllocation());
+#ifdef PROTOBUF_FORCE_COPY_DEFAULT_STRING
+  if (_impl_.object_name_.IsDefault()) {
+    _impl_.object_name_.Set("", GetArenaForAllocation());
+  }
+#endif // PROTOBUF_FORCE_COPY_DEFAULT_STRING
+  // @@protoc_insertion_point(field_set_allocated:greptime.v1.CommentOnExpr.object_name)
+}
+
+// string column_name = 5;
+inline void CommentOnExpr::clear_column_name() {
+  _impl_.column_name_.ClearToEmpty();
+}
+inline const std::string& CommentOnExpr::column_name() const {
+  // @@protoc_insertion_point(field_get:greptime.v1.CommentOnExpr.column_name)
+  return _internal_column_name();
+}
+template <typename ArgT0, typename... ArgT>
+inline PROTOBUF_ALWAYS_INLINE
+void CommentOnExpr::set_column_name(ArgT0&& arg0, ArgT... args) {
+ 
+ _impl_.column_name_.Set(static_cast<ArgT0 &&>(arg0), args..., GetArenaForAllocation());
+  // @@protoc_insertion_point(field_set:greptime.v1.CommentOnExpr.column_name)
+}
+inline std::string* CommentOnExpr::mutable_column_name() {
+  std::string* _s = _internal_mutable_column_name();
+  // @@protoc_insertion_point(field_mutable:greptime.v1.CommentOnExpr.column_name)
+  return _s;
+}
+inline const std::string& CommentOnExpr::_internal_column_name() const {
+  return _impl_.column_name_.Get();
+}
+inline void CommentOnExpr::_internal_set_column_name(const std::string& value) {
+  
+  _impl_.column_name_.Set(value, GetArenaForAllocation());
+}
+inline std::string* CommentOnExpr::_internal_mutable_column_name() {
+  
+  return _impl_.column_name_.Mutable(GetArenaForAllocation());
+}
+inline std::string* CommentOnExpr::release_column_name() {
+  // @@protoc_insertion_point(field_release:greptime.v1.CommentOnExpr.column_name)
+  return _impl_.column_name_.Release();
+}
+inline void CommentOnExpr::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.CommentOnExpr.column_name)
+}
+
+// string comment = 6;
+inline void CommentOnExpr::clear_comment() {
+  _impl_.comment_.ClearToEmpty();
+}
+inline const std::string& CommentOnExpr::comment() const {
+  // @@protoc_insertion_point(field_get:greptime.v1.CommentOnExpr.comment)
+  return _internal_comment();
+}
+template <typename ArgT0, typename... ArgT>
+inline PROTOBUF_ALWAYS_INLINE
+void CommentOnExpr::set_comment(ArgT0&& arg0, ArgT... args) {
+ 
+ _impl_.comment_.Set(static_cast<ArgT0 &&>(arg0), args..., GetArenaForAllocation());
+  // @@protoc_insertion_point(field_set:greptime.v1.CommentOnExpr.comment)
+}
+inline std::string* CommentOnExpr::mutable_comment() {
+  std::string* _s = _internal_mutable_comment();
+  // @@protoc_insertion_point(field_mutable:greptime.v1.CommentOnExpr.comment)
+  return _s;
+}
+inline const std::string& CommentOnExpr::_internal_comment() const {
+  return _impl_.comment_.Get();
+}
+inline void CommentOnExpr::_internal_set_comment(const std::string& value) {
+  
+  _impl_.comment_.Set(value, GetArenaForAllocation());
+}
+inline std::string* CommentOnExpr::_internal_mutable_comment() {
+  
+  return _impl_.comment_.Mutable(GetArenaForAllocation());
+}
+inline std::string* CommentOnExpr::release_comment() {
+  // @@protoc_insertion_point(field_release:greptime.v1.CommentOnExpr.comment)
+  return _impl_.comment_.Release();
+}
+inline void CommentOnExpr::set_allocated_comment(std::string* comment) {
+  if (comment != nullptr) {
+    
+  } else {
+    
+  }
+  _impl_.comment_.SetAllocated(comment, GetArenaForAllocation());
+#ifdef PROTOBUF_FORCE_COPY_DEFAULT_STRING
+  if (_impl_.comment_.IsDefault()) {
+    _impl_.comment_.Set("", GetArenaForAllocation());
+  }
+#endif // PROTOBUF_FORCE_COPY_DEFAULT_STRING
+  // @@protoc_insertion_point(field_set_allocated:greptime.v1.CommentOnExpr.comment)
+}
+
 #ifdef __GNUC__
   #pragma GCC diagnostic pop
 #endif  // __GNUC__
@@ -18808,6 +19436,8 @@ inline void DropTriggerExpr::set_drop_if_exists(bool value) {
 
 // -------------------------------------------------------------------
 
+// -------------------------------------------------------------------
+
 
 // @@protoc_insertion_point(namespace_scope)
 
@@ -18836,6 +19466,11 @@ template <>
 inline const EnumDescriptor* GetEnumDescriptor< ::greptime::v1::SkippingIndexType>() {
   return ::greptime::v1::SkippingIndexType_descriptor();
 }
+template <> struct is_proto_enum< ::greptime::v1::CommentObjectType> : ::std::true_type {};
+template <>
+inline const EnumDescriptor* GetEnumDescriptor< ::greptime::v1::CommentObjectType>() {
+  return ::greptime::v1::CommentObjectType_descriptor();
+}
 
 PROTOBUF_NAMESPACE_CLOSE
 

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

@@ -234,6 +234,19 @@ struct DropTriggerTaskDefaultTypeInternal {
   };
 };
 PROTOBUF_ATTRIBUTE_NO_DESTROY PROTOBUF_CONSTINIT PROTOBUF_ATTRIBUTE_INIT_PRIORITY1 DropTriggerTaskDefaultTypeInternal _DropTriggerTask_default_instance_;
+PROTOBUF_CONSTEXPR CommentOnTask::CommentOnTask(
+    ::_pbi::ConstantInitialized): _impl_{
+    /*decltype(_impl_.comment_on_)*/nullptr
+  , /*decltype(_impl_._cached_size_)*/{}} {}
+struct CommentOnTaskDefaultTypeInternal {
+  PROTOBUF_CONSTEXPR CommentOnTaskDefaultTypeInternal()
+      : _instance(::_pbi::ConstantInitialized{}) {}
+  ~CommentOnTaskDefaultTypeInternal() {}
+  union {
+    CommentOnTask _instance;
+  };
+};
+PROTOBUF_ATTRIBUTE_NO_DESTROY PROTOBUF_CONSTINIT PROTOBUF_ATTRIBUTE_INIT_PRIORITY1 CommentOnTaskDefaultTypeInternal _CommentOnTask_default_instance_;
 PROTOBUF_CONSTEXPR DdlTaskRequest::DdlTaskRequest(
     ::_pbi::ConstantInitialized): _impl_{
     /*decltype(_impl_.header_)*/nullptr
@@ -268,7 +281,7 @@ PROTOBUF_ATTRIBUTE_NO_DESTROY PROTOBUF_CONSTINIT PROTOBUF_ATTRIBUTE_INIT_PRIORIT
 }  // namespace meta
 }  // namespace v1
 }  // namespace greptime
-static ::_pb::Metadata file_level_metadata_greptime_2fv1_2fmeta_2fddl_2eproto[18];
+static ::_pb::Metadata file_level_metadata_greptime_2fv1_2fmeta_2fddl_2eproto[19];
 static const ::_pb::EnumDescriptor* file_level_enum_descriptors_greptime_2fv1_2fmeta_2fddl_2eproto[1];
 static constexpr ::_pb::ServiceDescriptor const** file_level_service_descriptors_greptime_2fv1_2fmeta_2fddl_2eproto = nullptr;
 
@@ -389,6 +402,13 @@ const uint32_t TableStruct_greptime_2fv1_2fmeta_2fddl_2eproto::offsets[] PROTOBU
   ~0u,  // no _inlined_string_donated_
   PROTOBUF_FIELD_OFFSET(::greptime::v1::meta::DropTriggerTask, _impl_.drop_trigger_),
   ~0u,  // no _has_bits_
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::meta::CommentOnTask, _internal_metadata_),
+  ~0u,  // no _extensions_
+  ~0u,  // no _oneof_case_
+  ~0u,  // no _weak_field_map_
+  ~0u,  // no _inlined_string_donated_
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::meta::CommentOnTask, _impl_.comment_on_),
+  ~0u,  // no _has_bits_
   PROTOBUF_FIELD_OFFSET(::greptime::v1::meta::DdlTaskRequest, _internal_metadata_),
   ~0u,  // no _extensions_
   PROTOBUF_FIELD_OFFSET(::greptime::v1::meta::DdlTaskRequest, _impl_._oneof_case_[0]),
@@ -412,6 +432,7 @@ const uint32_t TableStruct_greptime_2fv1_2fmeta_2fddl_2eproto::offsets[] PROTOBU
   ::_pbi::kInvalidFieldOffsetTag,
   ::_pbi::kInvalidFieldOffsetTag,
   ::_pbi::kInvalidFieldOffsetTag,
+  ::_pbi::kInvalidFieldOffsetTag,
   PROTOBUF_FIELD_OFFSET(::greptime::v1::meta::DdlTaskRequest, _impl_.task_),
   ~0u,  // no _has_bits_
   PROTOBUF_FIELD_OFFSET(::greptime::v1::meta::DdlTaskResponse, _internal_metadata_),
@@ -440,8 +461,9 @@ static const ::_pbi::MigrationSchema schemas[] PROTOBUF_SECTION_VARIABLE(protode
   { 94, -1, -1, sizeof(::greptime::v1::meta::AlterDatabaseTask)},
   { 101, -1, -1, sizeof(::greptime::v1::meta::CreateTriggerTask)},
   { 108, -1, -1, sizeof(::greptime::v1::meta::DropTriggerTask)},
-  { 115, -1, -1, sizeof(::greptime::v1::meta::DdlTaskRequest)},
+  { 115, -1, -1, sizeof(::greptime::v1::meta::CommentOnTask)},
-  { 140, -1, -1, sizeof(::greptime::v1::meta::DdlTaskResponse)},
+  { 122, -1, -1, sizeof(::greptime::v1::meta::DdlTaskRequest)},
+  { 148, -1, -1, sizeof(::greptime::v1::meta::DdlTaskResponse)},
 };
 
 static const ::_pb::Message* const file_default_instances[] = {
@@ -461,6 +483,7 @@ static const ::_pb::Message* const file_default_instances[] = {
   &::greptime::v1::meta::_AlterDatabaseTask_default_instance_._instance,
   &::greptime::v1::meta::_CreateTriggerTask_default_instance_._instance,
   &::greptime::v1::meta::_DropTriggerTask_default_instance_._instance,
+  &::greptime::v1::meta::_CommentOnTask_default_instance_._instance,
   &::greptime::v1::meta::_DdlTaskRequest_default_instance_._instance,
   &::greptime::v1::meta::_DdlTaskResponse_default_instance_._instance,
 };
@@ -500,42 +523,45 @@ const char descriptor_table_protodef_greptime_2fv1_2fmeta_2fddl_2eproto[] PROTOB
   "te_trigger\030\001 \001(\0132\036.greptime.v1.CreateTri"
   "ggerExpr\"E\n\017DropTriggerTask\0222\n\014drop_trig"
   "ger\030\001 \001(\0132\034.greptime.v1.DropTriggerExpr\""
-  "\371\010\n\016DdlTaskRequest\022/\n\006header\030\001 \001(\0132\037.gre"
+  "\?\n\rCommentOnTask\022.\n\ncomment_on\030\001 \001(\0132\032.g"
-  "ptime.v1.meta.RequestHeader\0220\n\rquery_con"
+  "reptime.v1.CommentOnExpr\"\265\t\n\016DdlTaskRequ"
-  "text\030@ \001(\0132\031.greptime.v1.QueryContext\022>\n"
+  "est\022/\n\006header\030\001 \001(\0132\037.greptime.v1.meta.R"
-  "\021create_table_task\030\002 \001(\0132!.greptime.v1.m"
+  "equestHeader\0220\n\rquery_context\030@ \001(\0132\031.gr"
-  "eta.CreateTableTaskH\000\022:\n\017drop_table_task"
+  "eptime.v1.QueryContext\022>\n\021create_table_t"
-  "\030\003 \001(\0132\037.greptime.v1.meta.DropTableTaskH"
+  "ask\030\002 \001(\0132!.greptime.v1.meta.CreateTable"
-  "\000\022<\n\020alter_table_task\030\004 \001(\0132 .greptime.v"
+  "TaskH\000\022:\n\017drop_table_task\030\003 \001(\0132\037.grepti"
-  "1.meta.AlterTableTaskH\000\022B\n\023truncate_tabl"
+  "me.v1.meta.DropTableTaskH\000\022<\n\020alter_tabl"
-  "e_task\030\005 \001(\0132#.greptime.v1.meta.Truncate"
+  "e_task\030\004 \001(\0132 .greptime.v1.meta.AlterTab"
-  "TableTaskH\000\022@\n\022create_table_tasks\030\006 \001(\0132"
+  "leTaskH\000\022B\n\023truncate_table_task\030\005 \001(\0132#."
-  "\".greptime.v1.meta.CreateTableTasksH\000\022<\n"
+  "greptime.v1.meta.TruncateTableTaskH\000\022@\n\022"
-  "\020drop_table_tasks\030\007 \001(\0132 .greptime.v1.me"
+  "create_table_tasks\030\006 \001(\0132\".greptime.v1.m"
-  "ta.DropTableTasksH\000\022>\n\021alter_table_tasks"
+  "eta.CreateTableTasksH\000\022<\n\020drop_table_tas"
-  "\030\010 \001(\0132!.greptime.v1.meta.AlterTableTask"
+  "ks\030\007 \001(\0132 .greptime.v1.meta.DropTableTas"
-  "sH\000\022@\n\022drop_database_task\030\t \001(\0132\".grepti"
+  "ksH\000\022>\n\021alter_table_tasks\030\010 \001(\0132!.grepti"
-  "me.v1.meta.DropDatabaseTaskH\000\022D\n\024create_"
+  "me.v1.meta.AlterTableTasksH\000\022@\n\022drop_dat"
-  "database_task\030\n \001(\0132$.greptime.v1.meta.C"
+  "abase_task\030\t \001(\0132\".greptime.v1.meta.Drop"
-  "reateDatabaseTaskH\000\022<\n\020create_flow_task\030"
+  "DatabaseTaskH\000\022D\n\024create_database_task\030\n"
-  "\013 \001(\0132 .greptime.v1.meta.CreateFlowTaskH"
+  " \001(\0132$.greptime.v1.meta.CreateDatabaseTa"
-  "\000\0228\n\016drop_flow_task\030\014 \001(\0132\036.greptime.v1."
+  "skH\000\022<\n\020create_flow_task\030\013 \001(\0132 .greptim"
-  "meta.DropFlowTaskH\000\022<\n\020create_view_task\030"
+  "e.v1.meta.CreateFlowTaskH\000\0228\n\016drop_flow_"
-  "\r \001(\0132 .greptime.v1.meta.CreateViewTaskH"
+  "task\030\014 \001(\0132\036.greptime.v1.meta.DropFlowTa"
-  "\000\0228\n\016drop_view_task\030\016 \001(\0132\036.greptime.v1."
+  "skH\000\022<\n\020create_view_task\030\r \001(\0132 .greptim"
-  "meta.DropViewTaskH\000\022B\n\023alter_database_ta"
+  "e.v1.meta.CreateViewTaskH\000\0228\n\016drop_view_"
-  "sk\030\017 \001(\0132#.greptime.v1.meta.AlterDatabas"
+  "task\030\016 \001(\0132\036.greptime.v1.meta.DropViewTa"
-  "eTaskH\000\022B\n\023create_trigger_task\030\020 \001(\0132#.g"
+  "skH\000\022B\n\023alter_database_task\030\017 \001(\0132#.grep"
-  "reptime.v1.meta.CreateTriggerTaskH\000\022>\n\021d"
+  "time.v1.meta.AlterDatabaseTaskH\000\022B\n\023crea"
-  "rop_trigger_task\030\021 \001(\0132!.greptime.v1.met"
+  "te_trigger_task\030\020 \001(\0132#.greptime.v1.meta"
-  "a.DropTriggerTaskH\000B\006\n\004task\"\230\001\n\017DdlTaskR"
+  ".CreateTriggerTaskH\000\022>\n\021drop_trigger_tas"
-  "esponse\0220\n\006header\030\001 \001(\0132 .greptime.v1.me"
+  "k\030\021 \001(\0132!.greptime.v1.meta.DropTriggerTa"
-  "ta.ResponseHeader\022*\n\003pid\030\002 \001(\0132\035.greptim"
+  "skH\000\022:\n\017comment_on_task\030\022 \001(\0132\037.greptime"
-  "e.v1.meta.ProcedureId\022\'\n\ttable_ids\030\005 \003(\013"
+  ".v1.meta.CommentOnTaskH\000B\006\n\004task\"\230\001\n\017Ddl"
-  "2\024.greptime.v1.TableId*#\n\013DdlTaskType\022\n\n"
+  "TaskResponse\0220\n\006header\030\001 \001(\0132 .greptime."
-  "\006Create\020\000\022\010\n\004Drop\020\001B<Z:github.com/Grepti"
+  "v1.meta.ResponseHeader\022*\n\003pid\030\002 \001(\0132\035.gr"
-  "meTeam/greptime-proto/go/greptime/v1/met"
+  "eptime.v1.meta.ProcedureId\022\'\n\ttable_ids\030"
-  "ab\006proto3"
+  "\005 \003(\0132\024.greptime.v1.TableId*#\n\013DdlTaskTy"
+  "pe\022\n\n\006Create\020\000\022\010\n\004Drop\020\001B<Z:github.com/G"
+  "reptimeTeam/greptime-proto/go/greptime/v"
+  "1/metab\006proto3"
   ;
 static const ::_pbi::DescriptorTable* const descriptor_table_greptime_2fv1_2fmeta_2fddl_2eproto_deps[4] = {
   &::descriptor_table_greptime_2fv1_2fcommon_2eproto,
@@ -545,9 +571,9 @@ static const ::_pbi::DescriptorTable* const descriptor_table_greptime_2fv1_2fmet
 };
 static ::_pbi::once_flag descriptor_table_greptime_2fv1_2fmeta_2fddl_2eproto_once;
 const ::_pbi::DescriptorTable descriptor_table_greptime_2fv1_2fmeta_2fddl_2eproto = {
-    false, false, 2769, descriptor_table_protodef_greptime_2fv1_2fmeta_2fddl_2eproto,
+    false, false, 2894, descriptor_table_protodef_greptime_2fv1_2fmeta_2fddl_2eproto,
     "greptime/v1/meta/ddl.proto",
-    &descriptor_table_greptime_2fv1_2fmeta_2fddl_2eproto_once, descriptor_table_greptime_2fv1_2fmeta_2fddl_2eproto_deps, 4, 18,
+    &descriptor_table_greptime_2fv1_2fmeta_2fddl_2eproto_once, descriptor_table_greptime_2fv1_2fmeta_2fddl_2eproto_deps, 4, 19,
     schemas, file_default_instances, TableStruct_greptime_2fv1_2fmeta_2fddl_2eproto::offsets,
     file_level_metadata_greptime_2fv1_2fmeta_2fddl_2eproto, file_level_enum_descriptors_greptime_2fv1_2fmeta_2fddl_2eproto,
     file_level_service_descriptors_greptime_2fv1_2fmeta_2fddl_2eproto,
@@ -3851,6 +3877,205 @@ void DropTriggerTask::InternalSwap(DropTriggerTask* other) {
 
 // ===================================================================
 
+class CommentOnTask::_Internal {
+ public:
+  static const ::greptime::v1::CommentOnExpr& comment_on(const CommentOnTask* msg);
+};
+
+const ::greptime::v1::CommentOnExpr&
+CommentOnTask::_Internal::comment_on(const CommentOnTask* msg) {
+  return *msg->_impl_.comment_on_;
+}
+void CommentOnTask::clear_comment_on() {
+  if (GetArenaForAllocation() == nullptr && _impl_.comment_on_ != nullptr) {
+    delete _impl_.comment_on_;
+  }
+  _impl_.comment_on_ = nullptr;
+}
+CommentOnTask::CommentOnTask(::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.meta.CommentOnTask)
+}
+CommentOnTask::CommentOnTask(const CommentOnTask& from)
+  : ::PROTOBUF_NAMESPACE_ID::Message() {
+  CommentOnTask* const _this = this; (void)_this;
+  new (&_impl_) Impl_{
+      decltype(_impl_.comment_on_){nullptr}
+    , /*decltype(_impl_._cached_size_)*/{}};
+
+  _internal_metadata_.MergeFrom<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>(from._internal_metadata_);
+  if (from._internal_has_comment_on()) {
+    _this->_impl_.comment_on_ = new ::greptime::v1::CommentOnExpr(*from._impl_.comment_on_);
+  }
+  // @@protoc_insertion_point(copy_constructor:greptime.v1.meta.CommentOnTask)
+}
+
+inline void CommentOnTask::SharedCtor(
+    ::_pb::Arena* arena, bool is_message_owned) {
+  (void)arena;
+  (void)is_message_owned;
+  new (&_impl_) Impl_{
+      decltype(_impl_.comment_on_){nullptr}
+    , /*decltype(_impl_._cached_size_)*/{}
+  };
+}
+
+CommentOnTask::~CommentOnTask() {
+  // @@protoc_insertion_point(destructor:greptime.v1.meta.CommentOnTask)
+  if (auto *arena = _internal_metadata_.DeleteReturnArena<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>()) {
+  (void)arena;
+    return;
+  }
+  SharedDtor();
+}
+
+inline void CommentOnTask::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaForAllocation() == nullptr);
+  if (this != internal_default_instance()) delete _impl_.comment_on_;
+}
+
+void CommentOnTask::SetCachedSize(int size) const {
+  _impl_._cached_size_.Set(size);
+}
+
+void CommentOnTask::Clear() {
+// @@protoc_insertion_point(message_clear_start:greptime.v1.meta.CommentOnTask)
+  uint32_t cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
+  if (GetArenaForAllocation() == nullptr && _impl_.comment_on_ != nullptr) {
+    delete _impl_.comment_on_;
+  }
+  _impl_.comment_on_ = nullptr;
+  _internal_metadata_.Clear<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>();
+}
+
+const char* CommentOnTask::_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) {
+      // .greptime.v1.CommentOnExpr comment_on = 1;
+      case 1:
+        if (PROTOBUF_PREDICT_TRUE(static_cast<uint8_t>(tag) == 10)) {
+          ptr = ctx->ParseMessage(_internal_mutable_comment_on(), 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* CommentOnTask::_InternalSerialize(
+    uint8_t* target, ::PROTOBUF_NAMESPACE_ID::io::EpsCopyOutputStream* stream) const {
+  // @@protoc_insertion_point(serialize_to_array_start:greptime.v1.meta.CommentOnTask)
+  uint32_t cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  // .greptime.v1.CommentOnExpr comment_on = 1;
+  if (this->_internal_has_comment_on()) {
+    target = ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::
+      InternalWriteMessage(1, _Internal::comment_on(this),
+        _Internal::comment_on(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.meta.CommentOnTask)
+  return target;
+}
+
+size_t CommentOnTask::ByteSizeLong() const {
+// @@protoc_insertion_point(message_byte_size_start:greptime.v1.meta.CommentOnTask)
+  size_t total_size = 0;
+
+  uint32_t cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
+  // .greptime.v1.CommentOnExpr comment_on = 1;
+  if (this->_internal_has_comment_on()) {
+    total_size += 1 +
+      ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::MessageSize(
+        *_impl_.comment_on_);
+  }
+
+  return MaybeComputeUnknownFieldsSize(total_size, &_impl_._cached_size_);
+}
+
+const ::PROTOBUF_NAMESPACE_ID::Message::ClassData CommentOnTask::_class_data_ = {
+    ::PROTOBUF_NAMESPACE_ID::Message::CopyWithSourceCheck,
+    CommentOnTask::MergeImpl
+};
+const ::PROTOBUF_NAMESPACE_ID::Message::ClassData*CommentOnTask::GetClassData() const { return &_class_data_; }
+
+
+void CommentOnTask::MergeImpl(::PROTOBUF_NAMESPACE_ID::Message& to_msg, const ::PROTOBUF_NAMESPACE_ID::Message& from_msg) {
+  auto* const _this = static_cast<CommentOnTask*>(&to_msg);
+  auto& from = static_cast<const CommentOnTask&>(from_msg);
+  // @@protoc_insertion_point(class_specific_merge_from_start:greptime.v1.meta.CommentOnTask)
+  GOOGLE_DCHECK_NE(&from, _this);
+  uint32_t cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  if (from._internal_has_comment_on()) {
+    _this->_internal_mutable_comment_on()->::greptime::v1::CommentOnExpr::MergeFrom(
+        from._internal_comment_on());
+  }
+  _this->_internal_metadata_.MergeFrom<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>(from._internal_metadata_);
+}
+
+void CommentOnTask::CopyFrom(const CommentOnTask& from) {
+// @@protoc_insertion_point(class_specific_copy_from_start:greptime.v1.meta.CommentOnTask)
+  if (&from == this) return;
+  Clear();
+  MergeFrom(from);
+}
+
+bool CommentOnTask::IsInitialized() const {
+  return true;
+}
+
+void CommentOnTask::InternalSwap(CommentOnTask* other) {
+  using std::swap;
+  _internal_metadata_.InternalSwap(&other->_internal_metadata_);
+  swap(_impl_.comment_on_, other->_impl_.comment_on_);
+}
+
+::PROTOBUF_NAMESPACE_ID::Metadata CommentOnTask::GetMetadata() const {
+  return ::_pbi::AssignDescriptors(
+      &descriptor_table_greptime_2fv1_2fmeta_2fddl_2eproto_getter, &descriptor_table_greptime_2fv1_2fmeta_2fddl_2eproto_once,
+      file_level_metadata_greptime_2fv1_2fmeta_2fddl_2eproto[16]);
+}
+
+// ===================================================================
+
 class DdlTaskRequest::_Internal {
  public:
   static const ::greptime::v1::meta::RequestHeader& header(const DdlTaskRequest* msg);
@@ -3871,6 +4096,7 @@ class DdlTaskRequest::_Internal {
   static const ::greptime::v1::meta::AlterDatabaseTask& alter_database_task(const DdlTaskRequest* msg);
   static const ::greptime::v1::meta::CreateTriggerTask& create_trigger_task(const DdlTaskRequest* msg);
   static const ::greptime::v1::meta::DropTriggerTask& drop_trigger_task(const DdlTaskRequest* msg);
+  static const ::greptime::v1::meta::CommentOnTask& comment_on_task(const DdlTaskRequest* msg);
 };
 
 const ::greptime::v1::meta::RequestHeader&
@@ -3945,6 +4171,10 @@ const ::greptime::v1::meta::DropTriggerTask&
 DdlTaskRequest::_Internal::drop_trigger_task(const DdlTaskRequest* msg) {
   return *msg->_impl_.task_.drop_trigger_task_;
 }
+const ::greptime::v1::meta::CommentOnTask&
+DdlTaskRequest::_Internal::comment_on_task(const DdlTaskRequest* msg) {
+  return *msg->_impl_.task_.comment_on_task_;
+}
 void DdlTaskRequest::clear_header() {
   if (GetArenaForAllocation() == nullptr && _impl_.header_ != nullptr) {
     delete _impl_.header_;
@@ -4197,6 +4427,21 @@ void DdlTaskRequest::set_allocated_drop_trigger_task(::greptime::v1::meta::DropT
   }
   // @@protoc_insertion_point(field_set_allocated:greptime.v1.meta.DdlTaskRequest.drop_trigger_task)
 }
+void DdlTaskRequest::set_allocated_comment_on_task(::greptime::v1::meta::CommentOnTask* comment_on_task) {
+  ::PROTOBUF_NAMESPACE_ID::Arena* message_arena = GetArenaForAllocation();
+  clear_task();
+  if (comment_on_task) {
+    ::PROTOBUF_NAMESPACE_ID::Arena* submessage_arena =
+      ::PROTOBUF_NAMESPACE_ID::Arena::InternalGetOwningArena(comment_on_task);
+    if (message_arena != submessage_arena) {
+      comment_on_task = ::PROTOBUF_NAMESPACE_ID::internal::GetOwnedMessage(
+          message_arena, comment_on_task, submessage_arena);
+    }
+    set_has_comment_on_task();
+    _impl_.task_.comment_on_task_ = comment_on_task;
+  }
+  // @@protoc_insertion_point(field_set_allocated:greptime.v1.meta.DdlTaskRequest.comment_on_task)
+}
 DdlTaskRequest::DdlTaskRequest(::PROTOBUF_NAMESPACE_ID::Arena* arena,
                          bool is_message_owned)
   : ::PROTOBUF_NAMESPACE_ID::Message(arena, is_message_owned) {
@@ -4302,6 +4547,11 @@ DdlTaskRequest::DdlTaskRequest(const DdlTaskRequest& from)
           from._internal_drop_trigger_task());
       break;
     }
+    case kCommentOnTask: {
+      _this->_internal_mutable_comment_on_task()->::greptime::v1::meta::CommentOnTask::MergeFrom(
+          from._internal_comment_on_task());
+      break;
+    }
     case TASK_NOT_SET: {
       break;
     }
@@ -4444,6 +4694,12 @@ void DdlTaskRequest::clear_task() {
       }
       break;
     }
+    case kCommentOnTask: {
+      if (GetArenaForAllocation() == nullptr) {
+        delete _impl_.task_.comment_on_task_;
+      }
+      break;
+    }
     case TASK_NOT_SET: {
       break;
     }
@@ -4612,6 +4868,14 @@ const char* DdlTaskRequest::_InternalParse(const char* ptr, ::_pbi::ParseContext
         } else
           goto handle_unusual;
         continue;
+      // .greptime.v1.meta.CommentOnTask comment_on_task = 18;
+      case 18:
+        if (PROTOBUF_PREDICT_TRUE(static_cast<uint8_t>(tag) == 146)) {
+          ptr = ctx->ParseMessage(_internal_mutable_comment_on_task(), ptr);
+          CHK_(ptr);
+        } else
+          goto handle_unusual;
+        continue;
       // .greptime.v1.QueryContext query_context = 64;
       case 64:
         if (PROTOBUF_PREDICT_TRUE(static_cast<uint8_t>(tag) == 2)) {
@@ -4768,6 +5032,13 @@ uint8_t* DdlTaskRequest::_InternalSerialize(
         _Internal::drop_trigger_task(this).GetCachedSize(), target, stream);
   }
 
+  // .greptime.v1.meta.CommentOnTask comment_on_task = 18;
+  if (_internal_has_comment_on_task()) {
+    target = ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::
+      InternalWriteMessage(18, _Internal::comment_on_task(this),
+        _Internal::comment_on_task(this).GetCachedSize(), target, stream);
+  }
+
   // .greptime.v1.QueryContext query_context = 64;
   if (this->_internal_has_query_context()) {
     target = ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::
@@ -4918,6 +5189,13 @@ size_t DdlTaskRequest::ByteSizeLong() const {
           *_impl_.task_.drop_trigger_task_);
       break;
     }
+    // .greptime.v1.meta.CommentOnTask comment_on_task = 18;
+    case kCommentOnTask: {
+      total_size += 2 +
+        ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::MessageSize(
+          *_impl_.task_.comment_on_task_);
+      break;
+    }
     case TASK_NOT_SET: {
       break;
     }
@@ -5029,6 +5307,11 @@ void DdlTaskRequest::MergeImpl(::PROTOBUF_NAMESPACE_ID::Message& to_msg, const :
           from._internal_drop_trigger_task());
       break;
     }
+    case kCommentOnTask: {
+      _this->_internal_mutable_comment_on_task()->::greptime::v1::meta::CommentOnTask::MergeFrom(
+          from._internal_comment_on_task());
+      break;
+    }
     case TASK_NOT_SET: {
       break;
     }
@@ -5063,7 +5346,7 @@ void DdlTaskRequest::InternalSwap(DdlTaskRequest* other) {
 ::PROTOBUF_NAMESPACE_ID::Metadata DdlTaskRequest::GetMetadata() const {
   return ::_pbi::AssignDescriptors(
       &descriptor_table_greptime_2fv1_2fmeta_2fddl_2eproto_getter, &descriptor_table_greptime_2fv1_2fmeta_2fddl_2eproto_once,
-      file_level_metadata_greptime_2fv1_2fmeta_2fddl_2eproto[16]);
+      file_level_metadata_greptime_2fv1_2fmeta_2fddl_2eproto[17]);
 }
 
 // ===================================================================
@@ -5351,7 +5634,7 @@ void DdlTaskResponse::InternalSwap(DdlTaskResponse* other) {
 ::PROTOBUF_NAMESPACE_ID::Metadata DdlTaskResponse::GetMetadata() const {
   return ::_pbi::AssignDescriptors(
       &descriptor_table_greptime_2fv1_2fmeta_2fddl_2eproto_getter, &descriptor_table_greptime_2fv1_2fmeta_2fddl_2eproto_once,
-      file_level_metadata_greptime_2fv1_2fmeta_2fddl_2eproto[17]);
+      file_level_metadata_greptime_2fv1_2fmeta_2fddl_2eproto[18]);
 }
 
 // @@protoc_insertion_point(namespace_scope)
@@ -5423,6 +5706,10 @@ template<> PROTOBUF_NOINLINE ::greptime::v1::meta::DropTriggerTask*
 Arena::CreateMaybeMessage< ::greptime::v1::meta::DropTriggerTask >(Arena* arena) {
   return Arena::CreateMessageInternal< ::greptime::v1::meta::DropTriggerTask >(arena);
 }
+template<> PROTOBUF_NOINLINE ::greptime::v1::meta::CommentOnTask*
+Arena::CreateMaybeMessage< ::greptime::v1::meta::CommentOnTask >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::greptime::v1::meta::CommentOnTask >(arena);
+}
 template<> PROTOBUF_NOINLINE ::greptime::v1::meta::DdlTaskRequest*
 Arena::CreateMaybeMessage< ::greptime::v1::meta::DdlTaskRequest >(Arena* arena) {
   return Arena::CreateMessageInternal< ::greptime::v1::meta::DdlTaskRequest >(arena);

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

@@ -61,6 +61,9 @@ extern AlterTableTaskDefaultTypeInternal _AlterTableTask_default_instance_;
 class AlterTableTasks;
 struct AlterTableTasksDefaultTypeInternal;
 extern AlterTableTasksDefaultTypeInternal _AlterTableTasks_default_instance_;
+class CommentOnTask;
+struct CommentOnTaskDefaultTypeInternal;
+extern CommentOnTaskDefaultTypeInternal _CommentOnTask_default_instance_;
 class CreateDatabaseTask;
 struct CreateDatabaseTaskDefaultTypeInternal;
 extern CreateDatabaseTaskDefaultTypeInternal _CreateDatabaseTask_default_instance_;
@@ -113,6 +116,7 @@ PROTOBUF_NAMESPACE_OPEN
 template<> ::greptime::v1::meta::AlterDatabaseTask* Arena::CreateMaybeMessage<::greptime::v1::meta::AlterDatabaseTask>(Arena*);
 template<> ::greptime::v1::meta::AlterTableTask* Arena::CreateMaybeMessage<::greptime::v1::meta::AlterTableTask>(Arena*);
 template<> ::greptime::v1::meta::AlterTableTasks* Arena::CreateMaybeMessage<::greptime::v1::meta::AlterTableTasks>(Arena*);
+template<> ::greptime::v1::meta::CommentOnTask* Arena::CreateMaybeMessage<::greptime::v1::meta::CommentOnTask>(Arena*);
 template<> ::greptime::v1::meta::CreateDatabaseTask* Arena::CreateMaybeMessage<::greptime::v1::meta::CreateDatabaseTask>(Arena*);
 template<> ::greptime::v1::meta::CreateFlowTask* Arena::CreateMaybeMessage<::greptime::v1::meta::CreateFlowTask>(Arena*);
 template<> ::greptime::v1::meta::CreateTableTask* Arena::CreateMaybeMessage<::greptime::v1::meta::CreateTableTask>(Arena*);
@@ -2724,6 +2728,163 @@ class DropTriggerTask final :
 };
 // -------------------------------------------------------------------
 
+class CommentOnTask final :
+    public ::PROTOBUF_NAMESPACE_ID::Message /* @@protoc_insertion_point(class_definition:greptime.v1.meta.CommentOnTask) */ {
+ public:
+  inline CommentOnTask() : CommentOnTask(nullptr) {}
+  ~CommentOnTask() override;
+  explicit PROTOBUF_CONSTEXPR CommentOnTask(::PROTOBUF_NAMESPACE_ID::internal::ConstantInitialized);
+
+  CommentOnTask(const CommentOnTask& from);
+  CommentOnTask(CommentOnTask&& from) noexcept
+    : CommentOnTask() {
+    *this = ::std::move(from);
+  }
+
+  inline CommentOnTask& operator=(const CommentOnTask& from) {
+    CopyFrom(from);
+    return *this;
+  }
+  inline CommentOnTask& operator=(CommentOnTask&& 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 CommentOnTask& default_instance() {
+    return *internal_default_instance();
+  }
+  static inline const CommentOnTask* internal_default_instance() {
+    return reinterpret_cast<const CommentOnTask*>(
+               &_CommentOnTask_default_instance_);
+  }
+  static constexpr int kIndexInFileMessages =
+    16;
+
+  friend void swap(CommentOnTask& a, CommentOnTask& b) {
+    a.Swap(&b);
+  }
+  inline void Swap(CommentOnTask* 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(CommentOnTask* other) {
+    if (other == this) return;
+    GOOGLE_DCHECK(GetOwningArena() == other->GetOwningArena());
+    InternalSwap(other);
+  }
+
+  // implements Message ----------------------------------------------
+
+  CommentOnTask* New(::PROTOBUF_NAMESPACE_ID::Arena* arena = nullptr) const final {
+    return CreateMaybeMessage<CommentOnTask>(arena);
+  }
+  using ::PROTOBUF_NAMESPACE_ID::Message::CopyFrom;
+  void CopyFrom(const CommentOnTask& from);
+  using ::PROTOBUF_NAMESPACE_ID::Message::MergeFrom;
+  void MergeFrom( const CommentOnTask& from) {
+    CommentOnTask::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(CommentOnTask* other);
+
+  private:
+  friend class ::PROTOBUF_NAMESPACE_ID::internal::AnyMetadata;
+  static ::PROTOBUF_NAMESPACE_ID::StringPiece FullMessageName() {
+    return "greptime.v1.meta.CommentOnTask";
+  }
+  protected:
+  explicit CommentOnTask(::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 {
+    kCommentOnFieldNumber = 1,
+  };
+  // .greptime.v1.CommentOnExpr comment_on = 1;
+  bool has_comment_on() const;
+  private:
+  bool _internal_has_comment_on() const;
+  public:
+  void clear_comment_on();
+  const ::greptime::v1::CommentOnExpr& comment_on() const;
+  PROTOBUF_NODISCARD ::greptime::v1::CommentOnExpr* release_comment_on();
+  ::greptime::v1::CommentOnExpr* mutable_comment_on();
+  void set_allocated_comment_on(::greptime::v1::CommentOnExpr* comment_on);
+  private:
+  const ::greptime::v1::CommentOnExpr& _internal_comment_on() const;
+  ::greptime::v1::CommentOnExpr* _internal_mutable_comment_on();
+  public:
+  void unsafe_arena_set_allocated_comment_on(
+      ::greptime::v1::CommentOnExpr* comment_on);
+  ::greptime::v1::CommentOnExpr* unsafe_arena_release_comment_on();
+
+  // @@protoc_insertion_point(class_scope:greptime.v1.meta.CommentOnTask)
+ private:
+  class _Internal;
+
+  template <typename T> friend class ::PROTOBUF_NAMESPACE_ID::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
+  struct Impl_ {
+    ::greptime::v1::CommentOnExpr* comment_on_;
+    mutable ::PROTOBUF_NAMESPACE_ID::internal::CachedSize _cached_size_;
+  };
+  union { Impl_ _impl_; };
+  friend struct ::TableStruct_greptime_2fv1_2fmeta_2fddl_2eproto;
+};
+// -------------------------------------------------------------------
+
 class DdlTaskRequest final :
     public ::PROTOBUF_NAMESPACE_ID::Message /* @@protoc_insertion_point(class_definition:greptime.v1.meta.DdlTaskRequest) */ {
  public:
@@ -2784,6 +2945,7 @@ class DdlTaskRequest final :
     kAlterDatabaseTask = 15,
     kCreateTriggerTask = 16,
     kDropTriggerTask = 17,
+    kCommentOnTask = 18,
     TASK_NOT_SET = 0,
   };
 
@@ -2792,7 +2954,7 @@ class DdlTaskRequest final :
                &_DdlTaskRequest_default_instance_);
   }
   static constexpr int kIndexInFileMessages =
-    16;
+    17;
 
   friend void swap(DdlTaskRequest& a, DdlTaskRequest& b) {
     a.Swap(&b);
@@ -2883,6 +3045,7 @@ class DdlTaskRequest final :
     kAlterDatabaseTaskFieldNumber = 15,
     kCreateTriggerTaskFieldNumber = 16,
     kDropTriggerTaskFieldNumber = 17,
+    kCommentOnTaskFieldNumber = 18,
   };
   // .greptime.v1.meta.RequestHeader header = 1;
   bool has_header() const;
@@ -3208,6 +3371,24 @@ class DdlTaskRequest final :
       ::greptime::v1::meta::DropTriggerTask* drop_trigger_task);
   ::greptime::v1::meta::DropTriggerTask* unsafe_arena_release_drop_trigger_task();
 
+  // .greptime.v1.meta.CommentOnTask comment_on_task = 18;
+  bool has_comment_on_task() const;
+  private:
+  bool _internal_has_comment_on_task() const;
+  public:
+  void clear_comment_on_task();
+  const ::greptime::v1::meta::CommentOnTask& comment_on_task() const;
+  PROTOBUF_NODISCARD ::greptime::v1::meta::CommentOnTask* release_comment_on_task();
+  ::greptime::v1::meta::CommentOnTask* mutable_comment_on_task();
+  void set_allocated_comment_on_task(::greptime::v1::meta::CommentOnTask* comment_on_task);
+  private:
+  const ::greptime::v1::meta::CommentOnTask& _internal_comment_on_task() const;
+  ::greptime::v1::meta::CommentOnTask* _internal_mutable_comment_on_task();
+  public:
+  void unsafe_arena_set_allocated_comment_on_task(
+      ::greptime::v1::meta::CommentOnTask* comment_on_task);
+  ::greptime::v1::meta::CommentOnTask* unsafe_arena_release_comment_on_task();
+
   void clear_task();
   TaskCase task_case() const;
   // @@protoc_insertion_point(class_scope:greptime.v1.meta.DdlTaskRequest)
@@ -3229,6 +3410,7 @@ class DdlTaskRequest final :
   void set_has_alter_database_task();
   void set_has_create_trigger_task();
   void set_has_drop_trigger_task();
+  void set_has_comment_on_task();
 
   inline bool has_task() const;
   inline void clear_has_task();
@@ -3258,6 +3440,7 @@ class DdlTaskRequest final :
       ::greptime::v1::meta::AlterDatabaseTask* alter_database_task_;
       ::greptime::v1::meta::CreateTriggerTask* create_trigger_task_;
       ::greptime::v1::meta::DropTriggerTask* drop_trigger_task_;
+      ::greptime::v1::meta::CommentOnTask* comment_on_task_;
     } task_;
     mutable ::PROTOBUF_NAMESPACE_ID::internal::CachedSize _cached_size_;
     uint32_t _oneof_case_[1];
@@ -3316,7 +3499,7 @@ class DdlTaskResponse final :
                &_DdlTaskResponse_default_instance_);
   }
   static constexpr int kIndexInFileMessages =
-    17;
+    18;
 
   friend void swap(DdlTaskResponse& a, DdlTaskResponse& b) {
     a.Swap(&b);
@@ -4898,6 +5081,95 @@ inline void DropTriggerTask::set_allocated_drop_trigger(::greptime::v1::DropTrig
 
 // -------------------------------------------------------------------
 
+// CommentOnTask
+
+// .greptime.v1.CommentOnExpr comment_on = 1;
+inline bool CommentOnTask::_internal_has_comment_on() const {
+  return this != internal_default_instance() && _impl_.comment_on_ != nullptr;
+}
+inline bool CommentOnTask::has_comment_on() const {
+  return _internal_has_comment_on();
+}
+inline const ::greptime::v1::CommentOnExpr& CommentOnTask::_internal_comment_on() const {
+  const ::greptime::v1::CommentOnExpr* p = _impl_.comment_on_;
+  return p != nullptr ? *p : reinterpret_cast<const ::greptime::v1::CommentOnExpr&>(
+      ::greptime::v1::_CommentOnExpr_default_instance_);
+}
+inline const ::greptime::v1::CommentOnExpr& CommentOnTask::comment_on() const {
+  // @@protoc_insertion_point(field_get:greptime.v1.meta.CommentOnTask.comment_on)
+  return _internal_comment_on();
+}
+inline void CommentOnTask::unsafe_arena_set_allocated_comment_on(
+    ::greptime::v1::CommentOnExpr* comment_on) {
+  if (GetArenaForAllocation() == nullptr) {
+    delete reinterpret_cast<::PROTOBUF_NAMESPACE_ID::MessageLite*>(_impl_.comment_on_);
+  }
+  _impl_.comment_on_ = comment_on;
+  if (comment_on) {
+    
+  } else {
+    
+  }
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:greptime.v1.meta.CommentOnTask.comment_on)
+}
+inline ::greptime::v1::CommentOnExpr* CommentOnTask::release_comment_on() {
+  
+  ::greptime::v1::CommentOnExpr* temp = _impl_.comment_on_;
+  _impl_.comment_on_ = 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::CommentOnExpr* CommentOnTask::unsafe_arena_release_comment_on() {
+  // @@protoc_insertion_point(field_release:greptime.v1.meta.CommentOnTask.comment_on)
+  
+  ::greptime::v1::CommentOnExpr* temp = _impl_.comment_on_;
+  _impl_.comment_on_ = nullptr;
+  return temp;
+}
+inline ::greptime::v1::CommentOnExpr* CommentOnTask::_internal_mutable_comment_on() {
+  
+  if (_impl_.comment_on_ == nullptr) {
+    auto* p = CreateMaybeMessage<::greptime::v1::CommentOnExpr>(GetArenaForAllocation());
+    _impl_.comment_on_ = p;
+  }
+  return _impl_.comment_on_;
+}
+inline ::greptime::v1::CommentOnExpr* CommentOnTask::mutable_comment_on() {
+  ::greptime::v1::CommentOnExpr* _msg = _internal_mutable_comment_on();
+  // @@protoc_insertion_point(field_mutable:greptime.v1.meta.CommentOnTask.comment_on)
+  return _msg;
+}
+inline void CommentOnTask::set_allocated_comment_on(::greptime::v1::CommentOnExpr* comment_on) {
+  ::PROTOBUF_NAMESPACE_ID::Arena* message_arena = GetArenaForAllocation();
+  if (message_arena == nullptr) {
+    delete reinterpret_cast< ::PROTOBUF_NAMESPACE_ID::MessageLite*>(_impl_.comment_on_);
+  }
+  if (comment_on) {
+    ::PROTOBUF_NAMESPACE_ID::Arena* submessage_arena =
+        ::PROTOBUF_NAMESPACE_ID::Arena::InternalGetOwningArena(
+                reinterpret_cast<::PROTOBUF_NAMESPACE_ID::MessageLite*>(comment_on));
+    if (message_arena != submessage_arena) {
+      comment_on = ::PROTOBUF_NAMESPACE_ID::internal::GetOwnedMessage(
+          message_arena, comment_on, submessage_arena);
+    }
+    
+  } else {
+    
+  }
+  _impl_.comment_on_ = comment_on;
+  // @@protoc_insertion_point(field_set_allocated:greptime.v1.meta.CommentOnTask.comment_on)
+}
+
+// -------------------------------------------------------------------
+
 // DdlTaskRequest
 
 // .greptime.v1.meta.RequestHeader header = 1;
@@ -6254,6 +6526,80 @@ inline ::greptime::v1::meta::DropTriggerTask* DdlTaskRequest::mutable_drop_trigg
   return _msg;
 }
 
+// .greptime.v1.meta.CommentOnTask comment_on_task = 18;
+inline bool DdlTaskRequest::_internal_has_comment_on_task() const {
+  return task_case() == kCommentOnTask;
+}
+inline bool DdlTaskRequest::has_comment_on_task() const {
+  return _internal_has_comment_on_task();
+}
+inline void DdlTaskRequest::set_has_comment_on_task() {
+  _impl_._oneof_case_[0] = kCommentOnTask;
+}
+inline void DdlTaskRequest::clear_comment_on_task() {
+  if (_internal_has_comment_on_task()) {
+    if (GetArenaForAllocation() == nullptr) {
+      delete _impl_.task_.comment_on_task_;
+    }
+    clear_has_task();
+  }
+}
+inline ::greptime::v1::meta::CommentOnTask* DdlTaskRequest::release_comment_on_task() {
+  // @@protoc_insertion_point(field_release:greptime.v1.meta.DdlTaskRequest.comment_on_task)
+  if (_internal_has_comment_on_task()) {
+    clear_has_task();
+    ::greptime::v1::meta::CommentOnTask* temp = _impl_.task_.comment_on_task_;
+    if (GetArenaForAllocation() != nullptr) {
+      temp = ::PROTOBUF_NAMESPACE_ID::internal::DuplicateIfNonNull(temp);
+    }
+    _impl_.task_.comment_on_task_ = nullptr;
+    return temp;
+  } else {
+    return nullptr;
+  }
+}
+inline const ::greptime::v1::meta::CommentOnTask& DdlTaskRequest::_internal_comment_on_task() const {
+  return _internal_has_comment_on_task()
+      ? *_impl_.task_.comment_on_task_
+      : reinterpret_cast< ::greptime::v1::meta::CommentOnTask&>(::greptime::v1::meta::_CommentOnTask_default_instance_);
+}
+inline const ::greptime::v1::meta::CommentOnTask& DdlTaskRequest::comment_on_task() const {
+  // @@protoc_insertion_point(field_get:greptime.v1.meta.DdlTaskRequest.comment_on_task)
+  return _internal_comment_on_task();
+}
+inline ::greptime::v1::meta::CommentOnTask* DdlTaskRequest::unsafe_arena_release_comment_on_task() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:greptime.v1.meta.DdlTaskRequest.comment_on_task)
+  if (_internal_has_comment_on_task()) {
+    clear_has_task();
+    ::greptime::v1::meta::CommentOnTask* temp = _impl_.task_.comment_on_task_;
+    _impl_.task_.comment_on_task_ = nullptr;
+    return temp;
+  } else {
+    return nullptr;
+  }
+}
+inline void DdlTaskRequest::unsafe_arena_set_allocated_comment_on_task(::greptime::v1::meta::CommentOnTask* comment_on_task) {
+  clear_task();
+  if (comment_on_task) {
+    set_has_comment_on_task();
+    _impl_.task_.comment_on_task_ = comment_on_task;
+  }
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:greptime.v1.meta.DdlTaskRequest.comment_on_task)
+}
+inline ::greptime::v1::meta::CommentOnTask* DdlTaskRequest::_internal_mutable_comment_on_task() {
+  if (!_internal_has_comment_on_task()) {
+    clear_task();
+    set_has_comment_on_task();
+    _impl_.task_.comment_on_task_ = CreateMaybeMessage< ::greptime::v1::meta::CommentOnTask >(GetArenaForAllocation());
+  }
+  return _impl_.task_.comment_on_task_;
+}
+inline ::greptime::v1::meta::CommentOnTask* DdlTaskRequest::mutable_comment_on_task() {
+  ::greptime::v1::meta::CommentOnTask* _msg = _internal_mutable_comment_on_task();
+  // @@protoc_insertion_point(field_mutable:greptime.v1.meta.DdlTaskRequest.comment_on_task)
+  return _msg;
+}
+
 inline bool DdlTaskRequest::has_task() const {
   return task_case() != TASK_NOT_SET;
 }
@@ -6511,6 +6857,8 @@ DdlTaskResponse::table_ids() const {
 
 // -------------------------------------------------------------------
 
+// -------------------------------------------------------------------
+
 
 // @@protoc_insertion_point(namespace_scope)
 

go/greptime/v1/meta/ddl.pb.go

@@ -860,6 +860,53 @@ func (x *DropTriggerTask) GetDropTrigger() *v1.DropTriggerExpr {
 	return nil
 }
 
+type CommentOnTask struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	CommentOn *v1.CommentOnExpr `protobuf:"bytes,1,opt,name=comment_on,json=commentOn,proto3" json:"comment_on,omitempty"`
+}
+
+func (x *CommentOnTask) Reset() {
+	*x = CommentOnTask{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_greptime_v1_meta_ddl_proto_msgTypes[16]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *CommentOnTask) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*CommentOnTask) ProtoMessage() {}
+
+func (x *CommentOnTask) ProtoReflect() protoreflect.Message {
+	mi := &file_greptime_v1_meta_ddl_proto_msgTypes[16]
+	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 CommentOnTask.ProtoReflect.Descriptor instead.
+func (*CommentOnTask) Descriptor() ([]byte, []int) {
+	return file_greptime_v1_meta_ddl_proto_rawDescGZIP(), []int{16}
+}
+
+func (x *CommentOnTask) GetCommentOn() *v1.CommentOnExpr {
+	if x != nil {
+		return x.CommentOn
+	}
+	return nil
+}
+
 type DdlTaskRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -885,13 +932,14 @@ type DdlTaskRequest struct {
 	//	*DdlTaskRequest_AlterDatabaseTask
 	//	*DdlTaskRequest_CreateTriggerTask
 	//	*DdlTaskRequest_DropTriggerTask
+	//	*DdlTaskRequest_CommentOnTask
 	Task isDdlTaskRequest_Task `protobuf_oneof:"task"`
 }
 
 func (x *DdlTaskRequest) Reset() {
 	*x = DdlTaskRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_greptime_v1_meta_ddl_proto_msgTypes[16]
+		mi := &file_greptime_v1_meta_ddl_proto_msgTypes[17]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -904,7 +952,7 @@ func (x *DdlTaskRequest) String() string {
 func (*DdlTaskRequest) ProtoMessage() {}
 
 func (x *DdlTaskRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_greptime_v1_meta_ddl_proto_msgTypes[16]
+	mi := &file_greptime_v1_meta_ddl_proto_msgTypes[17]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -917,7 +965,7 @@ func (x *DdlTaskRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use DdlTaskRequest.ProtoReflect.Descriptor instead.
 func (*DdlTaskRequest) Descriptor() ([]byte, []int) {
-	return file_greptime_v1_meta_ddl_proto_rawDescGZIP(), []int{16}
+	return file_greptime_v1_meta_ddl_proto_rawDescGZIP(), []int{17}
 }
 
 func (x *DdlTaskRequest) GetHeader() *RequestHeader {
@@ -1053,6 +1101,13 @@ func (x *DdlTaskRequest) GetDropTriggerTask() *DropTriggerTask {
 	return nil
 }
 
+func (x *DdlTaskRequest) GetCommentOnTask() *CommentOnTask {
+	if x, ok := x.GetTask().(*DdlTaskRequest_CommentOnTask); ok {
+		return x.CommentOnTask
+	}
+	return nil
+}
+
 type isDdlTaskRequest_Task interface {
 	isDdlTaskRequest_Task()
 }
@@ -1121,6 +1176,10 @@ type DdlTaskRequest_DropTriggerTask struct {
 	DropTriggerTask *DropTriggerTask `protobuf:"bytes,17,opt,name=drop_trigger_task,json=dropTriggerTask,proto3,oneof"`
 }
 
+type DdlTaskRequest_CommentOnTask struct {
+	CommentOnTask *CommentOnTask `protobuf:"bytes,18,opt,name=comment_on_task,json=commentOnTask,proto3,oneof"`
+}
+
 func (*DdlTaskRequest_CreateTableTask) isDdlTaskRequest_Task() {}
 
 func (*DdlTaskRequest_DropTableTask) isDdlTaskRequest_Task() {}
@@ -1153,6 +1212,8 @@ func (*DdlTaskRequest_CreateTriggerTask) isDdlTaskRequest_Task() {}
 
 func (*DdlTaskRequest_DropTriggerTask) isDdlTaskRequest_Task() {}
 
+func (*DdlTaskRequest_CommentOnTask) isDdlTaskRequest_Task() {}
+
 type DdlTaskResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1167,7 +1228,7 @@ type DdlTaskResponse struct {
 func (x *DdlTaskResponse) Reset() {
 	*x = DdlTaskResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_greptime_v1_meta_ddl_proto_msgTypes[17]
+		mi := &file_greptime_v1_meta_ddl_proto_msgTypes[18]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1180,7 +1241,7 @@ func (x *DdlTaskResponse) String() string {
 func (*DdlTaskResponse) ProtoMessage() {}
 
 func (x *DdlTaskResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_greptime_v1_meta_ddl_proto_msgTypes[17]
+	mi := &file_greptime_v1_meta_ddl_proto_msgTypes[18]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1193,7 +1254,7 @@ func (x *DdlTaskResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use DdlTaskResponse.ProtoReflect.Descriptor instead.
 func (*DdlTaskResponse) Descriptor() ([]byte, []int) {
-	return file_greptime_v1_meta_ddl_proto_rawDescGZIP(), []int{17}
+	return file_greptime_v1_meta_ddl_proto_rawDescGZIP(), []int{18}
 }
 
 func (x *DdlTaskResponse) GetHeader() *ResponseHeader {
@@ -1318,115 +1379,124 @@ var file_greptime_v1_meta_ddl_proto_rawDesc = []byte{
 	0x67, 0x65, 0x72, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x1c, 0x2e, 0x67, 0x72, 0x65, 0x70,
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 }
 
 var (
@@ -1442,7 +1512,7 @@ func file_greptime_v1_meta_ddl_proto_rawDescGZIP() []byte {
 }
 
 var file_greptime_v1_meta_ddl_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
-var file_greptime_v1_meta_ddl_proto_msgTypes = make([]protoimpl.MessageInfo, 18)
+var file_greptime_v1_meta_ddl_proto_msgTypes = make([]protoimpl.MessageInfo, 19)
 var file_greptime_v1_meta_ddl_proto_goTypes = []interface{}{
 	(DdlTaskType)(0),              // 0: greptime.v1.meta.DdlTaskType
 	(*CreateDatabaseTask)(nil),    // 1: greptime.v1.meta.CreateDatabaseTask
@@ -1461,72 +1531,76 @@ var file_greptime_v1_meta_ddl_proto_goTypes = []interface{}{
 	(*AlterDatabaseTask)(nil),     // 14: greptime.v1.meta.AlterDatabaseTask
 	(*CreateTriggerTask)(nil),     // 15: greptime.v1.meta.CreateTriggerTask
 	(*DropTriggerTask)(nil),       // 16: greptime.v1.meta.DropTriggerTask
-	(*DdlTaskRequest)(nil),        // 17: greptime.v1.meta.DdlTaskRequest
+	(*CommentOnTask)(nil),         // 17: greptime.v1.meta.CommentOnTask
-	(*DdlTaskResponse)(nil),       // 18: greptime.v1.meta.DdlTaskResponse
+	(*DdlTaskRequest)(nil),        // 18: greptime.v1.meta.DdlTaskRequest
-	(*v1.CreateDatabaseExpr)(nil), // 19: greptime.v1.CreateDatabaseExpr
+	(*DdlTaskResponse)(nil),       // 19: greptime.v1.meta.DdlTaskResponse
-	(*v1.CreateTableExpr)(nil),    // 20: greptime.v1.CreateTableExpr
+	(*v1.CreateDatabaseExpr)(nil), // 20: greptime.v1.CreateDatabaseExpr
-	(*Partition)(nil),             // 21: greptime.v1.meta.Partition
+	(*v1.CreateTableExpr)(nil),    // 21: greptime.v1.CreateTableExpr
-	(*v1.DropTableExpr)(nil),      // 22: greptime.v1.DropTableExpr
+	(*Partition)(nil),             // 22: greptime.v1.meta.Partition
-	(*v1.AlterTableExpr)(nil),     // 23: greptime.v1.AlterTableExpr
+	(*v1.DropTableExpr)(nil),      // 23: greptime.v1.DropTableExpr
-	(*v1.TruncateTableExpr)(nil),  // 24: greptime.v1.TruncateTableExpr
+	(*v1.AlterTableExpr)(nil),     // 24: greptime.v1.AlterTableExpr
-	(*v1.DropDatabaseExpr)(nil),   // 25: greptime.v1.DropDatabaseExpr
+	(*v1.TruncateTableExpr)(nil),  // 25: greptime.v1.TruncateTableExpr
-	(*v1.CreateFlowExpr)(nil),     // 26: greptime.v1.CreateFlowExpr
+	(*v1.DropDatabaseExpr)(nil),   // 26: greptime.v1.DropDatabaseExpr
-	(*v1.DropFlowExpr)(nil),       // 27: greptime.v1.DropFlowExpr
+	(*v1.CreateFlowExpr)(nil),     // 27: greptime.v1.CreateFlowExpr
-	(*v1.CreateViewExpr)(nil),     // 28: greptime.v1.CreateViewExpr
+	(*v1.DropFlowExpr)(nil),       // 28: greptime.v1.DropFlowExpr
-	(*v1.DropViewExpr)(nil),       // 29: greptime.v1.DropViewExpr
+	(*v1.CreateViewExpr)(nil),     // 29: greptime.v1.CreateViewExpr
-	(*v1.AlterDatabaseExpr)(nil),  // 30: greptime.v1.AlterDatabaseExpr
+	(*v1.DropViewExpr)(nil),       // 30: greptime.v1.DropViewExpr
-	(*v1.CreateTriggerExpr)(nil),  // 31: greptime.v1.CreateTriggerExpr
+	(*v1.AlterDatabaseExpr)(nil),  // 31: greptime.v1.AlterDatabaseExpr
-	(*v1.DropTriggerExpr)(nil),    // 32: greptime.v1.DropTriggerExpr
+	(*v1.CreateTriggerExpr)(nil),  // 32: greptime.v1.CreateTriggerExpr
-	(*RequestHeader)(nil),         // 33: greptime.v1.meta.RequestHeader
+	(*v1.DropTriggerExpr)(nil),    // 33: greptime.v1.DropTriggerExpr
-	(*v1.QueryContext)(nil),       // 34: greptime.v1.QueryContext
+	(*v1.CommentOnExpr)(nil),      // 34: greptime.v1.CommentOnExpr
-	(*ResponseHeader)(nil),        // 35: greptime.v1.meta.ResponseHeader
+	(*RequestHeader)(nil),         // 35: greptime.v1.meta.RequestHeader
-	(*ProcedureId)(nil),           // 36: greptime.v1.meta.ProcedureId
+	(*v1.QueryContext)(nil),       // 36: greptime.v1.QueryContext
-	(*v1.TableId)(nil),            // 37: greptime.v1.TableId
+	(*ResponseHeader)(nil),        // 37: greptime.v1.meta.ResponseHeader
+	(*ProcedureId)(nil),           // 38: greptime.v1.meta.ProcedureId
+	(*v1.TableId)(nil),            // 39: greptime.v1.TableId
 }
 var file_greptime_v1_meta_ddl_proto_depIdxs = []int32{
-	19, // 0: greptime.v1.meta.CreateDatabaseTask.create_database:type_name -> greptime.v1.CreateDatabaseExpr
+	20, // 0: greptime.v1.meta.CreateDatabaseTask.create_database:type_name -> greptime.v1.CreateDatabaseExpr
-	20, // 1: greptime.v1.meta.CreateTableTask.create_table:type_name -> greptime.v1.CreateTableExpr
+	21, // 1: greptime.v1.meta.CreateTableTask.create_table:type_name -> greptime.v1.CreateTableExpr
-	21, // 2: greptime.v1.meta.CreateTableTask.partitions:type_name -> greptime.v1.meta.Partition
+	22, // 2: greptime.v1.meta.CreateTableTask.partitions:type_name -> greptime.v1.meta.Partition
 	2,  // 3: greptime.v1.meta.CreateTableTasks.tasks:type_name -> greptime.v1.meta.CreateTableTask
-	22, // 4: greptime.v1.meta.DropTableTask.drop_table:type_name -> greptime.v1.DropTableExpr
+	23, // 4: greptime.v1.meta.DropTableTask.drop_table:type_name -> greptime.v1.DropTableExpr
 	4,  // 5: greptime.v1.meta.DropTableTasks.tasks:type_name -> greptime.v1.meta.DropTableTask
-	23, // 6: greptime.v1.meta.AlterTableTask.alter_table:type_name -> greptime.v1.AlterTableExpr
+	24, // 6: greptime.v1.meta.AlterTableTask.alter_table:type_name -> greptime.v1.AlterTableExpr
 	6,  // 7: greptime.v1.meta.AlterTableTasks.tasks:type_name -> greptime.v1.meta.AlterTableTask
-	24, // 8: greptime.v1.meta.TruncateTableTask.truncate_table:type_name -> greptime.v1.TruncateTableExpr
+	25, // 8: greptime.v1.meta.TruncateTableTask.truncate_table:type_name -> greptime.v1.TruncateTableExpr
-	25, // 9: greptime.v1.meta.DropDatabaseTask.drop_database:type_name -> greptime.v1.DropDatabaseExpr
+	26, // 9: greptime.v1.meta.DropDatabaseTask.drop_database:type_name -> greptime.v1.DropDatabaseExpr
-	26, // 10: greptime.v1.meta.CreateFlowTask.create_flow:type_name -> greptime.v1.CreateFlowExpr
+	27, // 10: greptime.v1.meta.CreateFlowTask.create_flow:type_name -> greptime.v1.CreateFlowExpr
-	27, // 11: greptime.v1.meta.DropFlowTask.drop_flow:type_name -> greptime.v1.DropFlowExpr
+	28, // 11: greptime.v1.meta.DropFlowTask.drop_flow:type_name -> greptime.v1.DropFlowExpr
-	28, // 12: greptime.v1.meta.CreateViewTask.create_view:type_name -> greptime.v1.CreateViewExpr
+	29, // 12: greptime.v1.meta.CreateViewTask.create_view:type_name -> greptime.v1.CreateViewExpr
-	29, // 13: greptime.v1.meta.DropViewTask.drop_view:type_name -> greptime.v1.DropViewExpr
+	30, // 13: greptime.v1.meta.DropViewTask.drop_view:type_name -> greptime.v1.DropViewExpr
-	30, // 14: greptime.v1.meta.AlterDatabaseTask.task:type_name -> greptime.v1.AlterDatabaseExpr
+	31, // 14: greptime.v1.meta.AlterDatabaseTask.task:type_name -> greptime.v1.AlterDatabaseExpr
-	31, // 15: greptime.v1.meta.CreateTriggerTask.create_trigger:type_name -> greptime.v1.CreateTriggerExpr
+	32, // 15: greptime.v1.meta.CreateTriggerTask.create_trigger:type_name -> greptime.v1.CreateTriggerExpr
-	32, // 16: greptime.v1.meta.DropTriggerTask.drop_trigger:type_name -> greptime.v1.DropTriggerExpr
+	33, // 16: greptime.v1.meta.DropTriggerTask.drop_trigger:type_name -> greptime.v1.DropTriggerExpr
-	33, // 17: greptime.v1.meta.DdlTaskRequest.header:type_name -> greptime.v1.meta.RequestHeader
+	34, // 17: greptime.v1.meta.CommentOnTask.comment_on:type_name -> greptime.v1.CommentOnExpr
-	34, // 18: greptime.v1.meta.DdlTaskRequest.query_context:type_name -> greptime.v1.QueryContext
+	35, // 18: greptime.v1.meta.DdlTaskRequest.header:type_name -> greptime.v1.meta.RequestHeader
-	2,  // 19: greptime.v1.meta.DdlTaskRequest.create_table_task:type_name -> greptime.v1.meta.CreateTableTask
+	36, // 19: greptime.v1.meta.DdlTaskRequest.query_context:type_name -> greptime.v1.QueryContext
-	4,  // 20: greptime.v1.meta.DdlTaskRequest.drop_table_task:type_name -> greptime.v1.meta.DropTableTask
+	2,  // 20: greptime.v1.meta.DdlTaskRequest.create_table_task:type_name -> greptime.v1.meta.CreateTableTask
-	6,  // 21: greptime.v1.meta.DdlTaskRequest.alter_table_task:type_name -> greptime.v1.meta.AlterTableTask
+	4,  // 21: greptime.v1.meta.DdlTaskRequest.drop_table_task:type_name -> greptime.v1.meta.DropTableTask
-	8,  // 22: greptime.v1.meta.DdlTaskRequest.truncate_table_task:type_name -> greptime.v1.meta.TruncateTableTask
+	6,  // 22: greptime.v1.meta.DdlTaskRequest.alter_table_task:type_name -> greptime.v1.meta.AlterTableTask
-	3,  // 23: greptime.v1.meta.DdlTaskRequest.create_table_tasks:type_name -> greptime.v1.meta.CreateTableTasks
+	8,  // 23: greptime.v1.meta.DdlTaskRequest.truncate_table_task:type_name -> greptime.v1.meta.TruncateTableTask
-	5,  // 24: greptime.v1.meta.DdlTaskRequest.drop_table_tasks:type_name -> greptime.v1.meta.DropTableTasks
+	3,  // 24: greptime.v1.meta.DdlTaskRequest.create_table_tasks:type_name -> greptime.v1.meta.CreateTableTasks
-	7,  // 25: greptime.v1.meta.DdlTaskRequest.alter_table_tasks:type_name -> greptime.v1.meta.AlterTableTasks
+	5,  // 25: greptime.v1.meta.DdlTaskRequest.drop_table_tasks:type_name -> greptime.v1.meta.DropTableTasks
-	9,  // 26: greptime.v1.meta.DdlTaskRequest.drop_database_task:type_name -> greptime.v1.meta.DropDatabaseTask
+	7,  // 26: greptime.v1.meta.DdlTaskRequest.alter_table_tasks:type_name -> greptime.v1.meta.AlterTableTasks
-	1,  // 27: greptime.v1.meta.DdlTaskRequest.create_database_task:type_name -> greptime.v1.meta.CreateDatabaseTask
+	9,  // 27: greptime.v1.meta.DdlTaskRequest.drop_database_task:type_name -> greptime.v1.meta.DropDatabaseTask
-	10, // 28: greptime.v1.meta.DdlTaskRequest.create_flow_task:type_name -> greptime.v1.meta.CreateFlowTask
+	1,  // 28: greptime.v1.meta.DdlTaskRequest.create_database_task:type_name -> greptime.v1.meta.CreateDatabaseTask
-	11, // 29: greptime.v1.meta.DdlTaskRequest.drop_flow_task:type_name -> greptime.v1.meta.DropFlowTask
+	10, // 29: greptime.v1.meta.DdlTaskRequest.create_flow_task:type_name -> greptime.v1.meta.CreateFlowTask
-	12, // 30: greptime.v1.meta.DdlTaskRequest.create_view_task:type_name -> greptime.v1.meta.CreateViewTask
+	11, // 30: greptime.v1.meta.DdlTaskRequest.drop_flow_task:type_name -> greptime.v1.meta.DropFlowTask
-	13, // 31: greptime.v1.meta.DdlTaskRequest.drop_view_task:type_name -> greptime.v1.meta.DropViewTask
+	12, // 31: greptime.v1.meta.DdlTaskRequest.create_view_task:type_name -> greptime.v1.meta.CreateViewTask
-	14, // 32: greptime.v1.meta.DdlTaskRequest.alter_database_task:type_name -> greptime.v1.meta.AlterDatabaseTask
+	13, // 32: greptime.v1.meta.DdlTaskRequest.drop_view_task:type_name -> greptime.v1.meta.DropViewTask
-	15, // 33: greptime.v1.meta.DdlTaskRequest.create_trigger_task:type_name -> greptime.v1.meta.CreateTriggerTask
+	14, // 33: greptime.v1.meta.DdlTaskRequest.alter_database_task:type_name -> greptime.v1.meta.AlterDatabaseTask
-	16, // 34: greptime.v1.meta.DdlTaskRequest.drop_trigger_task:type_name -> greptime.v1.meta.DropTriggerTask
+	15, // 34: greptime.v1.meta.DdlTaskRequest.create_trigger_task:type_name -> greptime.v1.meta.CreateTriggerTask
-	35, // 35: greptime.v1.meta.DdlTaskResponse.header:type_name -> greptime.v1.meta.ResponseHeader
+	16, // 35: greptime.v1.meta.DdlTaskRequest.drop_trigger_task:type_name -> greptime.v1.meta.DropTriggerTask
-	36, // 36: greptime.v1.meta.DdlTaskResponse.pid:type_name -> greptime.v1.meta.ProcedureId
+	17, // 36: greptime.v1.meta.DdlTaskRequest.comment_on_task:type_name -> greptime.v1.meta.CommentOnTask
-	37, // 37: greptime.v1.meta.DdlTaskResponse.table_ids:type_name -> greptime.v1.TableId
+	37, // 37: greptime.v1.meta.DdlTaskResponse.header:type_name -> greptime.v1.meta.ResponseHeader
-	38, // [38:38] is the sub-list for method output_type
+	38, // 38: greptime.v1.meta.DdlTaskResponse.pid:type_name -> greptime.v1.meta.ProcedureId
-	38, // [38:38] is the sub-list for method input_type
+	39, // 39: greptime.v1.meta.DdlTaskResponse.table_ids:type_name -> greptime.v1.TableId
-	38, // [38:38] is the sub-list for extension type_name
+	40, // [40:40] is the sub-list for method output_type
-	38, // [38:38] is the sub-list for extension extendee
+	40, // [40:40] is the sub-list for method input_type
-	0,  // [0:38] is the sub-list for field type_name
+	40, // [40:40] is the sub-list for extension type_name
+	40, // [40:40] is the sub-list for extension extendee
+	0,  // [0:40] is the sub-list for field type_name
 }
 
 func init() { file_greptime_v1_meta_ddl_proto_init() }
@@ -1730,7 +1804,7 @@ func file_greptime_v1_meta_ddl_proto_init() {
 			}
 		}
 		file_greptime_v1_meta_ddl_proto_msgTypes[16].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*DdlTaskRequest); i {
+			switch v := v.(*CommentOnTask); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1742,6 +1816,18 @@ func file_greptime_v1_meta_ddl_proto_init() {
 			}
 		}
 		file_greptime_v1_meta_ddl_proto_msgTypes[17].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*DdlTaskRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_greptime_v1_meta_ddl_proto_msgTypes[18].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*DdlTaskResponse); i {
 			case 0:
 				return &v.state
@@ -1754,7 +1840,7 @@ func file_greptime_v1_meta_ddl_proto_init() {
 			}
 		}
 	}
-	file_greptime_v1_meta_ddl_proto_msgTypes[16].OneofWrappers = []interface{}{
+	file_greptime_v1_meta_ddl_proto_msgTypes[17].OneofWrappers = []interface{}{
 		(*DdlTaskRequest_CreateTableTask)(nil),
 		(*DdlTaskRequest_DropTableTask)(nil),
 		(*DdlTaskRequest_AlterTableTask)(nil),
@@ -1771,6 +1857,7 @@ func file_greptime_v1_meta_ddl_proto_init() {
 		(*DdlTaskRequest_AlterDatabaseTask)(nil),
 		(*DdlTaskRequest_CreateTriggerTask)(nil),
 		(*DdlTaskRequest_DropTriggerTask)(nil),
+		(*DdlTaskRequest_CommentOnTask)(nil),
 	}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
@@ -1778,7 +1865,7 @@ func file_greptime_v1_meta_ddl_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_greptime_v1_meta_ddl_proto_rawDesc,
 			NumEnums:      1,
-			NumMessages:   18,
+			NumMessages:   19,
 			NumExtensions: 0,
 			NumServices:   0,
 		},

proto/greptime/v1/ddl.proto

@@ -39,6 +39,7 @@ message DdlRequest {
     CreateViewExpr create_view = 10;
     DropViewExpr drop_view = 11;
     AlterDatabaseExpr alter_database = 12;
+    CommentOnExpr comment_on = 13;
   }
 }
 
@@ -387,3 +388,22 @@ message DropTriggerExpr {
   string trigger_name = 2;
   bool drop_if_exists = 3;
 }
+
+// The type of object to comment on
+enum CommentObjectType {
+  TABLE = 0;
+  COLUMN = 1;
+  FLOW = 2;
+}
+
+// Comment on a table, column, or flow
+message CommentOnExpr {
+  string catalog_name = 1;
+  string schema_name = 2;
+  CommentObjectType object_type = 3;
+  string object_name = 4;
+  // Column name (only for Column comments)
+  string column_name = 5;
+  // The comment text (null to remove comment)
+  string comment = 6;
+}

proto/greptime/v1/meta/ddl.proto

@@ -98,6 +98,10 @@ message DropTriggerTask {
   DropTriggerExpr drop_trigger = 1;
 }
 
+message CommentOnTask {
+  CommentOnExpr comment_on = 1;
+}
+
 message DdlTaskRequest {
   RequestHeader header = 1;
   QueryContext query_context = 64;
@@ -119,6 +123,7 @@ message DdlTaskRequest {
     AlterDatabaseTask alter_database_task = 15;
     CreateTriggerTask create_trigger_task = 16;
     DropTriggerTask drop_trigger_task = 17;
+    CommentOnTask comment_on_task = 18;
   }
 }