feat: adds vector index meta (#307)

Signed-off-by: Dennis Zhuang <killme2008@gmail.com>

build.rs

@@ -70,6 +70,7 @@ fn main() {
                 "proto/greptime/v1/frontend/server.proto",
                 "proto/greptime/v1/index/bloom_filter.proto",
                 "proto/greptime/v1/index/inverted_index.proto",
+                "proto/greptime/v1/index/vector_index.proto",
                 "proto/prometheus/remote/remote.proto",
                 "proto/substrait_extension/promql_plan.proto",
                 "proto/substrait_extension/dist_plan.proto",

c++/greptime/v1/index/vector_index.grpc.pb.cc

@@ -0,0 +1,29 @@
+// Generated by the gRPC C++ plugin.
+// If you make any local change, they will be lost.
+// source: greptime/v1/index/vector_index.proto
+
+#include "greptime/v1/index/vector_index.pb.h"
+#include "greptime/v1/index/vector_index.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 greptime {
+namespace v1 {
+namespace index {
+
+}  // namespace greptime
+}  // namespace v1
+}  // namespace index
+

c++/greptime/v1/index/vector_index.grpc.pb.h

@@ -0,0 +1,52 @@
+// Generated by the gRPC C++ plugin.
+// If you make any local change, they will be lost.
+// source: greptime/v1/index/vector_index.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_greptime_2fv1_2findex_2fvector_5findex_2eproto__INCLUDED
+#define GRPC_greptime_2fv1_2findex_2fvector_5findex_2eproto__INCLUDED
+
+#include "greptime/v1/index/vector_index.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 greptime {
+namespace v1 {
+namespace index {
+
+}  // namespace index
+}  // namespace v1
+}  // namespace greptime
+
+
+#endif  // GRPC_greptime_2fv1_2findex_2fvector_5findex_2eproto__INCLUDED

c++/greptime/v1/index/vector_index.pb.cc

@@ -0,0 +1,826 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: greptime/v1/index/vector_index.proto
+
+#include "greptime/v1/index/vector_index.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 greptime {
+namespace v1 {
+namespace index {
+PROTOBUF_CONSTEXPR VectorIndexMeta::VectorIndexMeta(
+    ::_pbi::ConstantInitialized): _impl_{
+    /*decltype(_impl_.stats_)*/nullptr
+  , /*decltype(_impl_.engine_)*/0
+  , /*decltype(_impl_.dim_)*/0u
+  , /*decltype(_impl_.metric_)*/0
+  , /*decltype(_impl_.connectivity_)*/0u
+  , /*decltype(_impl_.expansion_add_)*/0u
+  , /*decltype(_impl_.expansion_search_)*/0u
+  , /*decltype(_impl_.index_size_)*/uint64_t{0u}
+  , /*decltype(_impl_.null_bitmap_size_)*/0u
+  , /*decltype(_impl_._cached_size_)*/{}} {}
+struct VectorIndexMetaDefaultTypeInternal {
+  PROTOBUF_CONSTEXPR VectorIndexMetaDefaultTypeInternal()
+      : _instance(::_pbi::ConstantInitialized{}) {}
+  ~VectorIndexMetaDefaultTypeInternal() {}
+  union {
+    VectorIndexMeta _instance;
+  };
+};
+PROTOBUF_ATTRIBUTE_NO_DESTROY PROTOBUF_CONSTINIT PROTOBUF_ATTRIBUTE_INIT_PRIORITY1 VectorIndexMetaDefaultTypeInternal _VectorIndexMeta_default_instance_;
+PROTOBUF_CONSTEXPR VectorIndexStats::VectorIndexStats(
+    ::_pbi::ConstantInitialized): _impl_{
+    /*decltype(_impl_.total_row_count_)*/uint64_t{0u}
+  , /*decltype(_impl_.indexed_row_count_)*/uint64_t{0u}
+  , /*decltype(_impl_.null_count_)*/uint64_t{0u}
+  , /*decltype(_impl_._cached_size_)*/{}} {}
+struct VectorIndexStatsDefaultTypeInternal {
+  PROTOBUF_CONSTEXPR VectorIndexStatsDefaultTypeInternal()
+      : _instance(::_pbi::ConstantInitialized{}) {}
+  ~VectorIndexStatsDefaultTypeInternal() {}
+  union {
+    VectorIndexStats _instance;
+  };
+};
+PROTOBUF_ATTRIBUTE_NO_DESTROY PROTOBUF_CONSTINIT PROTOBUF_ATTRIBUTE_INIT_PRIORITY1 VectorIndexStatsDefaultTypeInternal _VectorIndexStats_default_instance_;
+}  // namespace index
+}  // namespace v1
+}  // namespace greptime
+static ::_pb::Metadata file_level_metadata_greptime_2fv1_2findex_2fvector_5findex_2eproto[2];
+static const ::_pb::EnumDescriptor* file_level_enum_descriptors_greptime_2fv1_2findex_2fvector_5findex_2eproto[2];
+static constexpr ::_pb::ServiceDescriptor const** file_level_service_descriptors_greptime_2fv1_2findex_2fvector_5findex_2eproto = nullptr;
+
+const uint32_t TableStruct_greptime_2fv1_2findex_2fvector_5findex_2eproto::offsets[] PROTOBUF_SECTION_VARIABLE(protodesc_cold) = {
+  ~0u,  // no _has_bits_
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::index::VectorIndexMeta, _internal_metadata_),
+  ~0u,  // no _extensions_
+  ~0u,  // no _oneof_case_
+  ~0u,  // no _weak_field_map_
+  ~0u,  // no _inlined_string_donated_
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::index::VectorIndexMeta, _impl_.engine_),
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::index::VectorIndexMeta, _impl_.dim_),
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::index::VectorIndexMeta, _impl_.metric_),
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::index::VectorIndexMeta, _impl_.connectivity_),
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::index::VectorIndexMeta, _impl_.expansion_add_),
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::index::VectorIndexMeta, _impl_.expansion_search_),
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::index::VectorIndexMeta, _impl_.null_bitmap_size_),
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::index::VectorIndexMeta, _impl_.index_size_),
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::index::VectorIndexMeta, _impl_.stats_),
+  ~0u,  // no _has_bits_
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::index::VectorIndexStats, _internal_metadata_),
+  ~0u,  // no _extensions_
+  ~0u,  // no _oneof_case_
+  ~0u,  // no _weak_field_map_
+  ~0u,  // no _inlined_string_donated_
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::index::VectorIndexStats, _impl_.total_row_count_),
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::index::VectorIndexStats, _impl_.indexed_row_count_),
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::index::VectorIndexStats, _impl_.null_count_),
+};
+static const ::_pbi::MigrationSchema schemas[] PROTOBUF_SECTION_VARIABLE(protodesc_cold) = {
+  { 0, -1, -1, sizeof(::greptime::v1::index::VectorIndexMeta)},
+  { 15, -1, -1, sizeof(::greptime::v1::index::VectorIndexStats)},
+};
+
+static const ::_pb::Message* const file_default_instances[] = {
+  &::greptime::v1::index::_VectorIndexMeta_default_instance_._instance,
+  &::greptime::v1::index::_VectorIndexStats_default_instance_._instance,
+};
+
+const char descriptor_table_protodef_greptime_2fv1_2findex_2fvector_5findex_2eproto[] PROTOBUF_SECTION_VARIABLE(protodesc_cold) =
+  "\n$greptime/v1/index/vector_index.proto\022\021"
+  "greptime.v1.index\"\266\002\n\017VectorIndexMeta\0224\n"
+  "\006engine\030\001 \001(\0162$.greptime.v1.index.Vector"
+  "IndexEngine\022\013\n\003dim\030\002 \001(\r\0227\n\006metric\030\003 \001(\016"
+  "2\'.greptime.v1.index.VectorDistanceMetri"
+  "c\022\024\n\014connectivity\030\004 \001(\r\022\025\n\rexpansion_add"
+  "\030\005 \001(\r\022\030\n\020expansion_search\030\006 \001(\r\022\030\n\020null"
+  "_bitmap_size\030\007 \001(\r\022\022\n\nindex_size\030\010 \001(\004\0222"
+  "\n\005stats\030\t \001(\0132#.greptime.v1.index.Vector"
+  "IndexStats\"Z\n\020VectorIndexStats\022\027\n\017total_"
+  "row_count\030\001 \001(\004\022\031\n\021indexed_row_count\030\002 \001"
+  "(\004\022\022\n\nnull_count\030\003 \001(\004*4\n\021VectorIndexEng"
+  "ine\022\037\n\033VECTOR_INDEX_ENGINE_USEARCH\020\000*\204\001\n"
+  "\024VectorDistanceMetric\022\037\n\033VECTOR_DISTANCE"
+  "_METRIC_L2SQ\020\000\022!\n\035VECTOR_DISTANCE_METRIC"
+  "_COSINE\020\001\022(\n$VECTOR_DISTANCE_METRIC_INNE"
+  "R_PRODUCT\020\002B=Z;github.com/GreptimeTeam/g"
+  "reptime-proto/go/greptime/v1/indexb\006prot"
+  "o3"
+  ;
+static ::_pbi::once_flag descriptor_table_greptime_2fv1_2findex_2fvector_5findex_2eproto_once;
+const ::_pbi::DescriptorTable descriptor_table_greptime_2fv1_2findex_2fvector_5findex_2eproto = {
+    false, false, 722, descriptor_table_protodef_greptime_2fv1_2findex_2fvector_5findex_2eproto,
+    "greptime/v1/index/vector_index.proto",
+    &descriptor_table_greptime_2fv1_2findex_2fvector_5findex_2eproto_once, nullptr, 0, 2,
+    schemas, file_default_instances, TableStruct_greptime_2fv1_2findex_2fvector_5findex_2eproto::offsets,
+    file_level_metadata_greptime_2fv1_2findex_2fvector_5findex_2eproto, file_level_enum_descriptors_greptime_2fv1_2findex_2fvector_5findex_2eproto,
+    file_level_service_descriptors_greptime_2fv1_2findex_2fvector_5findex_2eproto,
+};
+PROTOBUF_ATTRIBUTE_WEAK const ::_pbi::DescriptorTable* descriptor_table_greptime_2fv1_2findex_2fvector_5findex_2eproto_getter() {
+  return &descriptor_table_greptime_2fv1_2findex_2fvector_5findex_2eproto;
+}
+
+// Force running AddDescriptors() at dynamic initialization time.
+PROTOBUF_ATTRIBUTE_INIT_PRIORITY2 static ::_pbi::AddDescriptorsRunner dynamic_init_dummy_greptime_2fv1_2findex_2fvector_5findex_2eproto(&descriptor_table_greptime_2fv1_2findex_2fvector_5findex_2eproto);
+namespace greptime {
+namespace v1 {
+namespace index {
+const ::PROTOBUF_NAMESPACE_ID::EnumDescriptor* VectorIndexEngine_descriptor() {
+  ::PROTOBUF_NAMESPACE_ID::internal::AssignDescriptors(&descriptor_table_greptime_2fv1_2findex_2fvector_5findex_2eproto);
+  return file_level_enum_descriptors_greptime_2fv1_2findex_2fvector_5findex_2eproto[0];
+}
+bool VectorIndexEngine_IsValid(int value) {
+  switch (value) {
+    case 0:
+      return true;
+    default:
+      return false;
+  }
+}
+
+const ::PROTOBUF_NAMESPACE_ID::EnumDescriptor* VectorDistanceMetric_descriptor() {
+  ::PROTOBUF_NAMESPACE_ID::internal::AssignDescriptors(&descriptor_table_greptime_2fv1_2findex_2fvector_5findex_2eproto);
+  return file_level_enum_descriptors_greptime_2fv1_2findex_2fvector_5findex_2eproto[1];
+}
+bool VectorDistanceMetric_IsValid(int value) {
+  switch (value) {
+    case 0:
+    case 1:
+    case 2:
+      return true;
+    default:
+      return false;
+  }
+}
+
+
+// ===================================================================
+
+class VectorIndexMeta::_Internal {
+ public:
+  static const ::greptime::v1::index::VectorIndexStats& stats(const VectorIndexMeta* msg);
+};
+
+const ::greptime::v1::index::VectorIndexStats&
+VectorIndexMeta::_Internal::stats(const VectorIndexMeta* msg) {
+  return *msg->_impl_.stats_;
+}
+VectorIndexMeta::VectorIndexMeta(::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.index.VectorIndexMeta)
+}
+VectorIndexMeta::VectorIndexMeta(const VectorIndexMeta& from)
+  : ::PROTOBUF_NAMESPACE_ID::Message() {
+  VectorIndexMeta* const _this = this; (void)_this;
+  new (&_impl_) Impl_{
+      decltype(_impl_.stats_){nullptr}
+    , decltype(_impl_.engine_){}
+    , decltype(_impl_.dim_){}
+    , decltype(_impl_.metric_){}
+    , decltype(_impl_.connectivity_){}
+    , decltype(_impl_.expansion_add_){}
+    , decltype(_impl_.expansion_search_){}
+    , decltype(_impl_.index_size_){}
+    , decltype(_impl_.null_bitmap_size_){}
+    , /*decltype(_impl_._cached_size_)*/{}};
+
+  _internal_metadata_.MergeFrom<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>(from._internal_metadata_);
+  if (from._internal_has_stats()) {
+    _this->_impl_.stats_ = new ::greptime::v1::index::VectorIndexStats(*from._impl_.stats_);
+  }
+  ::memcpy(&_impl_.engine_, &from._impl_.engine_,
+    static_cast<size_t>(reinterpret_cast<char*>(&_impl_.null_bitmap_size_) -
+    reinterpret_cast<char*>(&_impl_.engine_)) + sizeof(_impl_.null_bitmap_size_));
+  // @@protoc_insertion_point(copy_constructor:greptime.v1.index.VectorIndexMeta)
+}
+
+inline void VectorIndexMeta::SharedCtor(
+    ::_pb::Arena* arena, bool is_message_owned) {
+  (void)arena;
+  (void)is_message_owned;
+  new (&_impl_) Impl_{
+      decltype(_impl_.stats_){nullptr}
+    , decltype(_impl_.engine_){0}
+    , decltype(_impl_.dim_){0u}
+    , decltype(_impl_.metric_){0}
+    , decltype(_impl_.connectivity_){0u}
+    , decltype(_impl_.expansion_add_){0u}
+    , decltype(_impl_.expansion_search_){0u}
+    , decltype(_impl_.index_size_){uint64_t{0u}}
+    , decltype(_impl_.null_bitmap_size_){0u}
+    , /*decltype(_impl_._cached_size_)*/{}
+  };
+}
+
+VectorIndexMeta::~VectorIndexMeta() {
+  // @@protoc_insertion_point(destructor:greptime.v1.index.VectorIndexMeta)
+  if (auto *arena = _internal_metadata_.DeleteReturnArena<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>()) {
+  (void)arena;
+    return;
+  }
+  SharedDtor();
+}
+
+inline void VectorIndexMeta::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaForAllocation() == nullptr);
+  if (this != internal_default_instance()) delete _impl_.stats_;
+}
+
+void VectorIndexMeta::SetCachedSize(int size) const {
+  _impl_._cached_size_.Set(size);
+}
+
+void VectorIndexMeta::Clear() {
+// @@protoc_insertion_point(message_clear_start:greptime.v1.index.VectorIndexMeta)
+  uint32_t cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
+  if (GetArenaForAllocation() == nullptr && _impl_.stats_ != nullptr) {
+    delete _impl_.stats_;
+  }
+  _impl_.stats_ = nullptr;
+  ::memset(&_impl_.engine_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&_impl_.null_bitmap_size_) -
+      reinterpret_cast<char*>(&_impl_.engine_)) + sizeof(_impl_.null_bitmap_size_));
+  _internal_metadata_.Clear<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>();
+}
+
+const char* VectorIndexMeta::_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.index.VectorIndexEngine engine = 1;
+      case 1:
+        if (PROTOBUF_PREDICT_TRUE(static_cast<uint8_t>(tag) == 8)) {
+          uint64_t val = ::PROTOBUF_NAMESPACE_ID::internal::ReadVarint64(&ptr);
+          CHK_(ptr);
+          _internal_set_engine(static_cast<::greptime::v1::index::VectorIndexEngine>(val));
+        } else
+          goto handle_unusual;
+        continue;
+      // uint32 dim = 2;
+      case 2:
+        if (PROTOBUF_PREDICT_TRUE(static_cast<uint8_t>(tag) == 16)) {
+          _impl_.dim_ = ::PROTOBUF_NAMESPACE_ID::internal::ReadVarint32(&ptr);
+          CHK_(ptr);
+        } else
+          goto handle_unusual;
+        continue;
+      // .greptime.v1.index.VectorDistanceMetric metric = 3;
+      case 3:
+        if (PROTOBUF_PREDICT_TRUE(static_cast<uint8_t>(tag) == 24)) {
+          uint64_t val = ::PROTOBUF_NAMESPACE_ID::internal::ReadVarint64(&ptr);
+          CHK_(ptr);
+          _internal_set_metric(static_cast<::greptime::v1::index::VectorDistanceMetric>(val));
+        } else
+          goto handle_unusual;
+        continue;
+      // uint32 connectivity = 4;
+      case 4:
+        if (PROTOBUF_PREDICT_TRUE(static_cast<uint8_t>(tag) == 32)) {
+          _impl_.connectivity_ = ::PROTOBUF_NAMESPACE_ID::internal::ReadVarint32(&ptr);
+          CHK_(ptr);
+        } else
+          goto handle_unusual;
+        continue;
+      // uint32 expansion_add = 5;
+      case 5:
+        if (PROTOBUF_PREDICT_TRUE(static_cast<uint8_t>(tag) == 40)) {
+          _impl_.expansion_add_ = ::PROTOBUF_NAMESPACE_ID::internal::ReadVarint32(&ptr);
+          CHK_(ptr);
+        } else
+          goto handle_unusual;
+        continue;
+      // uint32 expansion_search = 6;
+      case 6:
+        if (PROTOBUF_PREDICT_TRUE(static_cast<uint8_t>(tag) == 48)) {
+          _impl_.expansion_search_ = ::PROTOBUF_NAMESPACE_ID::internal::ReadVarint32(&ptr);
+          CHK_(ptr);
+        } else
+          goto handle_unusual;
+        continue;
+      // uint32 null_bitmap_size = 7;
+      case 7:
+        if (PROTOBUF_PREDICT_TRUE(static_cast<uint8_t>(tag) == 56)) {
+          _impl_.null_bitmap_size_ = ::PROTOBUF_NAMESPACE_ID::internal::ReadVarint32(&ptr);
+          CHK_(ptr);
+        } else
+          goto handle_unusual;
+        continue;
+      // uint64 index_size = 8;
+      case 8:
+        if (PROTOBUF_PREDICT_TRUE(static_cast<uint8_t>(tag) == 64)) {
+          _impl_.index_size_ = ::PROTOBUF_NAMESPACE_ID::internal::ReadVarint64(&ptr);
+          CHK_(ptr);
+        } else
+          goto handle_unusual;
+        continue;
+      // .greptime.v1.index.VectorIndexStats stats = 9;
+      case 9:
+        if (PROTOBUF_PREDICT_TRUE(static_cast<uint8_t>(tag) == 74)) {
+          ptr = ctx->ParseMessage(_internal_mutable_stats(), 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* VectorIndexMeta::_InternalSerialize(
+    uint8_t* target, ::PROTOBUF_NAMESPACE_ID::io::EpsCopyOutputStream* stream) const {
+  // @@protoc_insertion_point(serialize_to_array_start:greptime.v1.index.VectorIndexMeta)
+  uint32_t cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  // .greptime.v1.index.VectorIndexEngine engine = 1;
+  if (this->_internal_engine() != 0) {
+    target = stream->EnsureSpace(target);
+    target = ::_pbi::WireFormatLite::WriteEnumToArray(
+      1, this->_internal_engine(), target);
+  }
+
+  // uint32 dim = 2;
+  if (this->_internal_dim() != 0) {
+    target = stream->EnsureSpace(target);
+    target = ::_pbi::WireFormatLite::WriteUInt32ToArray(2, this->_internal_dim(), target);
+  }
+
+  // .greptime.v1.index.VectorDistanceMetric metric = 3;
+  if (this->_internal_metric() != 0) {
+    target = stream->EnsureSpace(target);
+    target = ::_pbi::WireFormatLite::WriteEnumToArray(
+      3, this->_internal_metric(), target);
+  }
+
+  // uint32 connectivity = 4;
+  if (this->_internal_connectivity() != 0) {
+    target = stream->EnsureSpace(target);
+    target = ::_pbi::WireFormatLite::WriteUInt32ToArray(4, this->_internal_connectivity(), target);
+  }
+
+  // uint32 expansion_add = 5;
+  if (this->_internal_expansion_add() != 0) {
+    target = stream->EnsureSpace(target);
+    target = ::_pbi::WireFormatLite::WriteUInt32ToArray(5, this->_internal_expansion_add(), target);
+  }
+
+  // uint32 expansion_search = 6;
+  if (this->_internal_expansion_search() != 0) {
+    target = stream->EnsureSpace(target);
+    target = ::_pbi::WireFormatLite::WriteUInt32ToArray(6, this->_internal_expansion_search(), target);
+  }
+
+  // uint32 null_bitmap_size = 7;
+  if (this->_internal_null_bitmap_size() != 0) {
+    target = stream->EnsureSpace(target);
+    target = ::_pbi::WireFormatLite::WriteUInt32ToArray(7, this->_internal_null_bitmap_size(), target);
+  }
+
+  // uint64 index_size = 8;
+  if (this->_internal_index_size() != 0) {
+    target = stream->EnsureSpace(target);
+    target = ::_pbi::WireFormatLite::WriteUInt64ToArray(8, this->_internal_index_size(), target);
+  }
+
+  // .greptime.v1.index.VectorIndexStats stats = 9;
+  if (this->_internal_has_stats()) {
+    target = ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::
+      InternalWriteMessage(9, _Internal::stats(this),
+        _Internal::stats(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.index.VectorIndexMeta)
+  return target;
+}
+
+size_t VectorIndexMeta::ByteSizeLong() const {
+// @@protoc_insertion_point(message_byte_size_start:greptime.v1.index.VectorIndexMeta)
+  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.index.VectorIndexStats stats = 9;
+  if (this->_internal_has_stats()) {
+    total_size += 1 +
+      ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::MessageSize(
+        *_impl_.stats_);
+  }
+
+  // .greptime.v1.index.VectorIndexEngine engine = 1;
+  if (this->_internal_engine() != 0) {
+    total_size += 1 +
+      ::_pbi::WireFormatLite::EnumSize(this->_internal_engine());
+  }
+
+  // uint32 dim = 2;
+  if (this->_internal_dim() != 0) {
+    total_size += ::_pbi::WireFormatLite::UInt32SizePlusOne(this->_internal_dim());
+  }
+
+  // .greptime.v1.index.VectorDistanceMetric metric = 3;
+  if (this->_internal_metric() != 0) {
+    total_size += 1 +
+      ::_pbi::WireFormatLite::EnumSize(this->_internal_metric());
+  }
+
+  // uint32 connectivity = 4;
+  if (this->_internal_connectivity() != 0) {
+    total_size += ::_pbi::WireFormatLite::UInt32SizePlusOne(this->_internal_connectivity());
+  }
+
+  // uint32 expansion_add = 5;
+  if (this->_internal_expansion_add() != 0) {
+    total_size += ::_pbi::WireFormatLite::UInt32SizePlusOne(this->_internal_expansion_add());
+  }
+
+  // uint32 expansion_search = 6;
+  if (this->_internal_expansion_search() != 0) {
+    total_size += ::_pbi::WireFormatLite::UInt32SizePlusOne(this->_internal_expansion_search());
+  }
+
+  // uint64 index_size = 8;
+  if (this->_internal_index_size() != 0) {
+    total_size += ::_pbi::WireFormatLite::UInt64SizePlusOne(this->_internal_index_size());
+  }
+
+  // uint32 null_bitmap_size = 7;
+  if (this->_internal_null_bitmap_size() != 0) {
+    total_size += ::_pbi::WireFormatLite::UInt32SizePlusOne(this->_internal_null_bitmap_size());
+  }
+
+  return MaybeComputeUnknownFieldsSize(total_size, &_impl_._cached_size_);
+}
+
+const ::PROTOBUF_NAMESPACE_ID::Message::ClassData VectorIndexMeta::_class_data_ = {
+    ::PROTOBUF_NAMESPACE_ID::Message::CopyWithSourceCheck,
+    VectorIndexMeta::MergeImpl
+};
+const ::PROTOBUF_NAMESPACE_ID::Message::ClassData*VectorIndexMeta::GetClassData() const { return &_class_data_; }
+
+
+void VectorIndexMeta::MergeImpl(::PROTOBUF_NAMESPACE_ID::Message& to_msg, const ::PROTOBUF_NAMESPACE_ID::Message& from_msg) {
+  auto* const _this = static_cast<VectorIndexMeta*>(&to_msg);
+  auto& from = static_cast<const VectorIndexMeta&>(from_msg);
+  // @@protoc_insertion_point(class_specific_merge_from_start:greptime.v1.index.VectorIndexMeta)
+  GOOGLE_DCHECK_NE(&from, _this);
+  uint32_t cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  if (from._internal_has_stats()) {
+    _this->_internal_mutable_stats()->::greptime::v1::index::VectorIndexStats::MergeFrom(
+        from._internal_stats());
+  }
+  if (from._internal_engine() != 0) {
+    _this->_internal_set_engine(from._internal_engine());
+  }
+  if (from._internal_dim() != 0) {
+    _this->_internal_set_dim(from._internal_dim());
+  }
+  if (from._internal_metric() != 0) {
+    _this->_internal_set_metric(from._internal_metric());
+  }
+  if (from._internal_connectivity() != 0) {
+    _this->_internal_set_connectivity(from._internal_connectivity());
+  }
+  if (from._internal_expansion_add() != 0) {
+    _this->_internal_set_expansion_add(from._internal_expansion_add());
+  }
+  if (from._internal_expansion_search() != 0) {
+    _this->_internal_set_expansion_search(from._internal_expansion_search());
+  }
+  if (from._internal_index_size() != 0) {
+    _this->_internal_set_index_size(from._internal_index_size());
+  }
+  if (from._internal_null_bitmap_size() != 0) {
+    _this->_internal_set_null_bitmap_size(from._internal_null_bitmap_size());
+  }
+  _this->_internal_metadata_.MergeFrom<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>(from._internal_metadata_);
+}
+
+void VectorIndexMeta::CopyFrom(const VectorIndexMeta& from) {
+// @@protoc_insertion_point(class_specific_copy_from_start:greptime.v1.index.VectorIndexMeta)
+  if (&from == this) return;
+  Clear();
+  MergeFrom(from);
+}
+
+bool VectorIndexMeta::IsInitialized() const {
+  return true;
+}
+
+void VectorIndexMeta::InternalSwap(VectorIndexMeta* other) {
+  using std::swap;
+  _internal_metadata_.InternalSwap(&other->_internal_metadata_);
+  ::PROTOBUF_NAMESPACE_ID::internal::memswap<
+      PROTOBUF_FIELD_OFFSET(VectorIndexMeta, _impl_.null_bitmap_size_)
+      + sizeof(VectorIndexMeta::_impl_.null_bitmap_size_)
+      - PROTOBUF_FIELD_OFFSET(VectorIndexMeta, _impl_.stats_)>(
+          reinterpret_cast<char*>(&_impl_.stats_),
+          reinterpret_cast<char*>(&other->_impl_.stats_));
+}
+
+::PROTOBUF_NAMESPACE_ID::Metadata VectorIndexMeta::GetMetadata() const {
+  return ::_pbi::AssignDescriptors(
+      &descriptor_table_greptime_2fv1_2findex_2fvector_5findex_2eproto_getter, &descriptor_table_greptime_2fv1_2findex_2fvector_5findex_2eproto_once,
+      file_level_metadata_greptime_2fv1_2findex_2fvector_5findex_2eproto[0]);
+}
+
+// ===================================================================
+
+class VectorIndexStats::_Internal {
+ public:
+};
+
+VectorIndexStats::VectorIndexStats(::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.index.VectorIndexStats)
+}
+VectorIndexStats::VectorIndexStats(const VectorIndexStats& from)
+  : ::PROTOBUF_NAMESPACE_ID::Message() {
+  VectorIndexStats* const _this = this; (void)_this;
+  new (&_impl_) Impl_{
+      decltype(_impl_.total_row_count_){}
+    , decltype(_impl_.indexed_row_count_){}
+    , decltype(_impl_.null_count_){}
+    , /*decltype(_impl_._cached_size_)*/{}};
+
+  _internal_metadata_.MergeFrom<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>(from._internal_metadata_);
+  ::memcpy(&_impl_.total_row_count_, &from._impl_.total_row_count_,
+    static_cast<size_t>(reinterpret_cast<char*>(&_impl_.null_count_) -
+    reinterpret_cast<char*>(&_impl_.total_row_count_)) + sizeof(_impl_.null_count_));
+  // @@protoc_insertion_point(copy_constructor:greptime.v1.index.VectorIndexStats)
+}
+
+inline void VectorIndexStats::SharedCtor(
+    ::_pb::Arena* arena, bool is_message_owned) {
+  (void)arena;
+  (void)is_message_owned;
+  new (&_impl_) Impl_{
+      decltype(_impl_.total_row_count_){uint64_t{0u}}
+    , decltype(_impl_.indexed_row_count_){uint64_t{0u}}
+    , decltype(_impl_.null_count_){uint64_t{0u}}
+    , /*decltype(_impl_._cached_size_)*/{}
+  };
+}
+
+VectorIndexStats::~VectorIndexStats() {
+  // @@protoc_insertion_point(destructor:greptime.v1.index.VectorIndexStats)
+  if (auto *arena = _internal_metadata_.DeleteReturnArena<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>()) {
+  (void)arena;
+    return;
+  }
+  SharedDtor();
+}
+
+inline void VectorIndexStats::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaForAllocation() == nullptr);
+}
+
+void VectorIndexStats::SetCachedSize(int size) const {
+  _impl_._cached_size_.Set(size);
+}
+
+void VectorIndexStats::Clear() {
+// @@protoc_insertion_point(message_clear_start:greptime.v1.index.VectorIndexStats)
+  uint32_t cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
+  ::memset(&_impl_.total_row_count_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&_impl_.null_count_) -
+      reinterpret_cast<char*>(&_impl_.total_row_count_)) + sizeof(_impl_.null_count_));
+  _internal_metadata_.Clear<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>();
+}
+
+const char* VectorIndexStats::_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) {
+      // uint64 total_row_count = 1;
+      case 1:
+        if (PROTOBUF_PREDICT_TRUE(static_cast<uint8_t>(tag) == 8)) {
+          _impl_.total_row_count_ = ::PROTOBUF_NAMESPACE_ID::internal::ReadVarint64(&ptr);
+          CHK_(ptr);
+        } else
+          goto handle_unusual;
+        continue;
+      // uint64 indexed_row_count = 2;
+      case 2:
+        if (PROTOBUF_PREDICT_TRUE(static_cast<uint8_t>(tag) == 16)) {
+          _impl_.indexed_row_count_ = ::PROTOBUF_NAMESPACE_ID::internal::ReadVarint64(&ptr);
+          CHK_(ptr);
+        } else
+          goto handle_unusual;
+        continue;
+      // uint64 null_count = 3;
+      case 3:
+        if (PROTOBUF_PREDICT_TRUE(static_cast<uint8_t>(tag) == 24)) {
+          _impl_.null_count_ = ::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* VectorIndexStats::_InternalSerialize(
+    uint8_t* target, ::PROTOBUF_NAMESPACE_ID::io::EpsCopyOutputStream* stream) const {
+  // @@protoc_insertion_point(serialize_to_array_start:greptime.v1.index.VectorIndexStats)
+  uint32_t cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  // uint64 total_row_count = 1;
+  if (this->_internal_total_row_count() != 0) {
+    target = stream->EnsureSpace(target);
+    target = ::_pbi::WireFormatLite::WriteUInt64ToArray(1, this->_internal_total_row_count(), target);
+  }
+
+  // uint64 indexed_row_count = 2;
+  if (this->_internal_indexed_row_count() != 0) {
+    target = stream->EnsureSpace(target);
+    target = ::_pbi::WireFormatLite::WriteUInt64ToArray(2, this->_internal_indexed_row_count(), target);
+  }
+
+  // uint64 null_count = 3;
+  if (this->_internal_null_count() != 0) {
+    target = stream->EnsureSpace(target);
+    target = ::_pbi::WireFormatLite::WriteUInt64ToArray(3, this->_internal_null_count(), 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:greptime.v1.index.VectorIndexStats)
+  return target;
+}
+
+size_t VectorIndexStats::ByteSizeLong() const {
+// @@protoc_insertion_point(message_byte_size_start:greptime.v1.index.VectorIndexStats)
+  size_t total_size = 0;
+
+  uint32_t cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
+  // uint64 total_row_count = 1;
+  if (this->_internal_total_row_count() != 0) {
+    total_size += ::_pbi::WireFormatLite::UInt64SizePlusOne(this->_internal_total_row_count());
+  }
+
+  // uint64 indexed_row_count = 2;
+  if (this->_internal_indexed_row_count() != 0) {
+    total_size += ::_pbi::WireFormatLite::UInt64SizePlusOne(this->_internal_indexed_row_count());
+  }
+
+  // uint64 null_count = 3;
+  if (this->_internal_null_count() != 0) {
+    total_size += ::_pbi::WireFormatLite::UInt64SizePlusOne(this->_internal_null_count());
+  }
+
+  return MaybeComputeUnknownFieldsSize(total_size, &_impl_._cached_size_);
+}
+
+const ::PROTOBUF_NAMESPACE_ID::Message::ClassData VectorIndexStats::_class_data_ = {
+    ::PROTOBUF_NAMESPACE_ID::Message::CopyWithSourceCheck,
+    VectorIndexStats::MergeImpl
+};
+const ::PROTOBUF_NAMESPACE_ID::Message::ClassData*VectorIndexStats::GetClassData() const { return &_class_data_; }
+
+
+void VectorIndexStats::MergeImpl(::PROTOBUF_NAMESPACE_ID::Message& to_msg, const ::PROTOBUF_NAMESPACE_ID::Message& from_msg) {
+  auto* const _this = static_cast<VectorIndexStats*>(&to_msg);
+  auto& from = static_cast<const VectorIndexStats&>(from_msg);
+  // @@protoc_insertion_point(class_specific_merge_from_start:greptime.v1.index.VectorIndexStats)
+  GOOGLE_DCHECK_NE(&from, _this);
+  uint32_t cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  if (from._internal_total_row_count() != 0) {
+    _this->_internal_set_total_row_count(from._internal_total_row_count());
+  }
+  if (from._internal_indexed_row_count() != 0) {
+    _this->_internal_set_indexed_row_count(from._internal_indexed_row_count());
+  }
+  if (from._internal_null_count() != 0) {
+    _this->_internal_set_null_count(from._internal_null_count());
+  }
+  _this->_internal_metadata_.MergeFrom<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>(from._internal_metadata_);
+}
+
+void VectorIndexStats::CopyFrom(const VectorIndexStats& from) {
+// @@protoc_insertion_point(class_specific_copy_from_start:greptime.v1.index.VectorIndexStats)
+  if (&from == this) return;
+  Clear();
+  MergeFrom(from);
+}
+
+bool VectorIndexStats::IsInitialized() const {
+  return true;
+}
+
+void VectorIndexStats::InternalSwap(VectorIndexStats* other) {
+  using std::swap;
+  _internal_metadata_.InternalSwap(&other->_internal_metadata_);
+  ::PROTOBUF_NAMESPACE_ID::internal::memswap<
+      PROTOBUF_FIELD_OFFSET(VectorIndexStats, _impl_.null_count_)
+      + sizeof(VectorIndexStats::_impl_.null_count_)
+      - PROTOBUF_FIELD_OFFSET(VectorIndexStats, _impl_.total_row_count_)>(
+          reinterpret_cast<char*>(&_impl_.total_row_count_),
+          reinterpret_cast<char*>(&other->_impl_.total_row_count_));
+}
+
+::PROTOBUF_NAMESPACE_ID::Metadata VectorIndexStats::GetMetadata() const {
+  return ::_pbi::AssignDescriptors(
+      &descriptor_table_greptime_2fv1_2findex_2fvector_5findex_2eproto_getter, &descriptor_table_greptime_2fv1_2findex_2fvector_5findex_2eproto_once,
+      file_level_metadata_greptime_2fv1_2findex_2fvector_5findex_2eproto[1]);
+}
+
+// @@protoc_insertion_point(namespace_scope)
+}  // namespace index
+}  // namespace v1
+}  // namespace greptime
+PROTOBUF_NAMESPACE_OPEN
+template<> PROTOBUF_NOINLINE ::greptime::v1::index::VectorIndexMeta*
+Arena::CreateMaybeMessage< ::greptime::v1::index::VectorIndexMeta >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::greptime::v1::index::VectorIndexMeta >(arena);
+}
+template<> PROTOBUF_NOINLINE ::greptime::v1::index::VectorIndexStats*
+Arena::CreateMaybeMessage< ::greptime::v1::index::VectorIndexStats >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::greptime::v1::index::VectorIndexStats >(arena);
+}
+PROTOBUF_NAMESPACE_CLOSE
+
+// @@protoc_insertion_point(global_scope)
+#include <google/protobuf/port_undef.inc>

c++/greptime/v1/index/vector_index.pb.h

@@ -0,0 +1,888 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: greptime/v1/index/vector_index.proto
+
+#ifndef GOOGLE_PROTOBUF_INCLUDED_greptime_2fv1_2findex_2fvector_5findex_2eproto
+#define GOOGLE_PROTOBUF_INCLUDED_greptime_2fv1_2findex_2fvector_5findex_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/generated_enum_reflection.h>
+#include <google/protobuf/unknown_field_set.h>
+// @@protoc_insertion_point(includes)
+#include <google/protobuf/port_def.inc>
+#define PROTOBUF_INTERNAL_EXPORT_greptime_2fv1_2findex_2fvector_5findex_2eproto
+PROTOBUF_NAMESPACE_OPEN
+namespace internal {
+class AnyMetadata;
+}  // namespace internal
+PROTOBUF_NAMESPACE_CLOSE
+
+// Internal implementation detail -- do not use these members.
+struct TableStruct_greptime_2fv1_2findex_2fvector_5findex_2eproto {
+  static const uint32_t offsets[];
+};
+extern const ::PROTOBUF_NAMESPACE_ID::internal::DescriptorTable descriptor_table_greptime_2fv1_2findex_2fvector_5findex_2eproto;
+namespace greptime {
+namespace v1 {
+namespace index {
+class VectorIndexMeta;
+struct VectorIndexMetaDefaultTypeInternal;
+extern VectorIndexMetaDefaultTypeInternal _VectorIndexMeta_default_instance_;
+class VectorIndexStats;
+struct VectorIndexStatsDefaultTypeInternal;
+extern VectorIndexStatsDefaultTypeInternal _VectorIndexStats_default_instance_;
+}  // namespace index
+}  // namespace v1
+}  // namespace greptime
+PROTOBUF_NAMESPACE_OPEN
+template<> ::greptime::v1::index::VectorIndexMeta* Arena::CreateMaybeMessage<::greptime::v1::index::VectorIndexMeta>(Arena*);
+template<> ::greptime::v1::index::VectorIndexStats* Arena::CreateMaybeMessage<::greptime::v1::index::VectorIndexStats>(Arena*);
+PROTOBUF_NAMESPACE_CLOSE
+namespace greptime {
+namespace v1 {
+namespace index {
+
+enum VectorIndexEngine : int {
+  VECTOR_INDEX_ENGINE_USEARCH = 0,
+  VectorIndexEngine_INT_MIN_SENTINEL_DO_NOT_USE_ = std::numeric_limits<int32_t>::min(),
+  VectorIndexEngine_INT_MAX_SENTINEL_DO_NOT_USE_ = std::numeric_limits<int32_t>::max()
+};
+bool VectorIndexEngine_IsValid(int value);
+constexpr VectorIndexEngine VectorIndexEngine_MIN = VECTOR_INDEX_ENGINE_USEARCH;
+constexpr VectorIndexEngine VectorIndexEngine_MAX = VECTOR_INDEX_ENGINE_USEARCH;
+constexpr int VectorIndexEngine_ARRAYSIZE = VectorIndexEngine_MAX + 1;
+
+const ::PROTOBUF_NAMESPACE_ID::EnumDescriptor* VectorIndexEngine_descriptor();
+template<typename T>
+inline const std::string& VectorIndexEngine_Name(T enum_t_value) {
+  static_assert(::std::is_same<T, VectorIndexEngine>::value ||
+    ::std::is_integral<T>::value,
+    "Incorrect type passed to function VectorIndexEngine_Name.");
+  return ::PROTOBUF_NAMESPACE_ID::internal::NameOfEnum(
+    VectorIndexEngine_descriptor(), enum_t_value);
+}
+inline bool VectorIndexEngine_Parse(
+    ::PROTOBUF_NAMESPACE_ID::ConstStringParam name, VectorIndexEngine* value) {
+  return ::PROTOBUF_NAMESPACE_ID::internal::ParseNamedEnum<VectorIndexEngine>(
+    VectorIndexEngine_descriptor(), name, value);
+}
+enum VectorDistanceMetric : int {
+  VECTOR_DISTANCE_METRIC_L2SQ = 0,
+  VECTOR_DISTANCE_METRIC_COSINE = 1,
+  VECTOR_DISTANCE_METRIC_INNER_PRODUCT = 2,
+  VectorDistanceMetric_INT_MIN_SENTINEL_DO_NOT_USE_ = std::numeric_limits<int32_t>::min(),
+  VectorDistanceMetric_INT_MAX_SENTINEL_DO_NOT_USE_ = std::numeric_limits<int32_t>::max()
+};
+bool VectorDistanceMetric_IsValid(int value);
+constexpr VectorDistanceMetric VectorDistanceMetric_MIN = VECTOR_DISTANCE_METRIC_L2SQ;
+constexpr VectorDistanceMetric VectorDistanceMetric_MAX = VECTOR_DISTANCE_METRIC_INNER_PRODUCT;
+constexpr int VectorDistanceMetric_ARRAYSIZE = VectorDistanceMetric_MAX + 1;
+
+const ::PROTOBUF_NAMESPACE_ID::EnumDescriptor* VectorDistanceMetric_descriptor();
+template<typename T>
+inline const std::string& VectorDistanceMetric_Name(T enum_t_value) {
+  static_assert(::std::is_same<T, VectorDistanceMetric>::value ||
+    ::std::is_integral<T>::value,
+    "Incorrect type passed to function VectorDistanceMetric_Name.");
+  return ::PROTOBUF_NAMESPACE_ID::internal::NameOfEnum(
+    VectorDistanceMetric_descriptor(), enum_t_value);
+}
+inline bool VectorDistanceMetric_Parse(
+    ::PROTOBUF_NAMESPACE_ID::ConstStringParam name, VectorDistanceMetric* value) {
+  return ::PROTOBUF_NAMESPACE_ID::internal::ParseNamedEnum<VectorDistanceMetric>(
+    VectorDistanceMetric_descriptor(), name, value);
+}
+// ===================================================================
+
+class VectorIndexMeta final :
+    public ::PROTOBUF_NAMESPACE_ID::Message /* @@protoc_insertion_point(class_definition:greptime.v1.index.VectorIndexMeta) */ {
+ public:
+  inline VectorIndexMeta() : VectorIndexMeta(nullptr) {}
+  ~VectorIndexMeta() override;
+  explicit PROTOBUF_CONSTEXPR VectorIndexMeta(::PROTOBUF_NAMESPACE_ID::internal::ConstantInitialized);
+
+  VectorIndexMeta(const VectorIndexMeta& from);
+  VectorIndexMeta(VectorIndexMeta&& from) noexcept
+    : VectorIndexMeta() {
+    *this = ::std::move(from);
+  }
+
+  inline VectorIndexMeta& operator=(const VectorIndexMeta& from) {
+    CopyFrom(from);
+    return *this;
+  }
+  inline VectorIndexMeta& operator=(VectorIndexMeta&& 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 VectorIndexMeta& default_instance() {
+    return *internal_default_instance();
+  }
+  static inline const VectorIndexMeta* internal_default_instance() {
+    return reinterpret_cast<const VectorIndexMeta*>(
+               &_VectorIndexMeta_default_instance_);
+  }
+  static constexpr int kIndexInFileMessages =
+    0;
+
+  friend void swap(VectorIndexMeta& a, VectorIndexMeta& b) {
+    a.Swap(&b);
+  }
+  inline void Swap(VectorIndexMeta* 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(VectorIndexMeta* other) {
+    if (other == this) return;
+    GOOGLE_DCHECK(GetOwningArena() == other->GetOwningArena());
+    InternalSwap(other);
+  }
+
+  // implements Message ----------------------------------------------
+
+  VectorIndexMeta* New(::PROTOBUF_NAMESPACE_ID::Arena* arena = nullptr) const final {
+    return CreateMaybeMessage<VectorIndexMeta>(arena);
+  }
+  using ::PROTOBUF_NAMESPACE_ID::Message::CopyFrom;
+  void CopyFrom(const VectorIndexMeta& from);
+  using ::PROTOBUF_NAMESPACE_ID::Message::MergeFrom;
+  void MergeFrom( const VectorIndexMeta& from) {
+    VectorIndexMeta::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(VectorIndexMeta* other);
+
+  private:
+  friend class ::PROTOBUF_NAMESPACE_ID::internal::AnyMetadata;
+  static ::PROTOBUF_NAMESPACE_ID::StringPiece FullMessageName() {
+    return "greptime.v1.index.VectorIndexMeta";
+  }
+  protected:
+  explicit VectorIndexMeta(::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 {
+    kStatsFieldNumber = 9,
+    kEngineFieldNumber = 1,
+    kDimFieldNumber = 2,
+    kMetricFieldNumber = 3,
+    kConnectivityFieldNumber = 4,
+    kExpansionAddFieldNumber = 5,
+    kExpansionSearchFieldNumber = 6,
+    kIndexSizeFieldNumber = 8,
+    kNullBitmapSizeFieldNumber = 7,
+  };
+  // .greptime.v1.index.VectorIndexStats stats = 9;
+  bool has_stats() const;
+  private:
+  bool _internal_has_stats() const;
+  public:
+  void clear_stats();
+  const ::greptime::v1::index::VectorIndexStats& stats() const;
+  PROTOBUF_NODISCARD ::greptime::v1::index::VectorIndexStats* release_stats();
+  ::greptime::v1::index::VectorIndexStats* mutable_stats();
+  void set_allocated_stats(::greptime::v1::index::VectorIndexStats* stats);
+  private:
+  const ::greptime::v1::index::VectorIndexStats& _internal_stats() const;
+  ::greptime::v1::index::VectorIndexStats* _internal_mutable_stats();
+  public:
+  void unsafe_arena_set_allocated_stats(
+      ::greptime::v1::index::VectorIndexStats* stats);
+  ::greptime::v1::index::VectorIndexStats* unsafe_arena_release_stats();
+
+  // .greptime.v1.index.VectorIndexEngine engine = 1;
+  void clear_engine();
+  ::greptime::v1::index::VectorIndexEngine engine() const;
+  void set_engine(::greptime::v1::index::VectorIndexEngine value);
+  private:
+  ::greptime::v1::index::VectorIndexEngine _internal_engine() const;
+  void _internal_set_engine(::greptime::v1::index::VectorIndexEngine value);
+  public:
+
+  // uint32 dim = 2;
+  void clear_dim();
+  uint32_t dim() const;
+  void set_dim(uint32_t value);
+  private:
+  uint32_t _internal_dim() const;
+  void _internal_set_dim(uint32_t value);
+  public:
+
+  // .greptime.v1.index.VectorDistanceMetric metric = 3;
+  void clear_metric();
+  ::greptime::v1::index::VectorDistanceMetric metric() const;
+  void set_metric(::greptime::v1::index::VectorDistanceMetric value);
+  private:
+  ::greptime::v1::index::VectorDistanceMetric _internal_metric() const;
+  void _internal_set_metric(::greptime::v1::index::VectorDistanceMetric value);
+  public:
+
+  // uint32 connectivity = 4;
+  void clear_connectivity();
+  uint32_t connectivity() const;
+  void set_connectivity(uint32_t value);
+  private:
+  uint32_t _internal_connectivity() const;
+  void _internal_set_connectivity(uint32_t value);
+  public:
+
+  // uint32 expansion_add = 5;
+  void clear_expansion_add();
+  uint32_t expansion_add() const;
+  void set_expansion_add(uint32_t value);
+  private:
+  uint32_t _internal_expansion_add() const;
+  void _internal_set_expansion_add(uint32_t value);
+  public:
+
+  // uint32 expansion_search = 6;
+  void clear_expansion_search();
+  uint32_t expansion_search() const;
+  void set_expansion_search(uint32_t value);
+  private:
+  uint32_t _internal_expansion_search() const;
+  void _internal_set_expansion_search(uint32_t value);
+  public:
+
+  // uint64 index_size = 8;
+  void clear_index_size();
+  uint64_t index_size() const;
+  void set_index_size(uint64_t value);
+  private:
+  uint64_t _internal_index_size() const;
+  void _internal_set_index_size(uint64_t value);
+  public:
+
+  // uint32 null_bitmap_size = 7;
+  void clear_null_bitmap_size();
+  uint32_t null_bitmap_size() const;
+  void set_null_bitmap_size(uint32_t value);
+  private:
+  uint32_t _internal_null_bitmap_size() const;
+  void _internal_set_null_bitmap_size(uint32_t value);
+  public:
+
+  // @@protoc_insertion_point(class_scope:greptime.v1.index.VectorIndexMeta)
+ private:
+  class _Internal;
+
+  template <typename T> friend class ::PROTOBUF_NAMESPACE_ID::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
+  struct Impl_ {
+    ::greptime::v1::index::VectorIndexStats* stats_;
+    int engine_;
+    uint32_t dim_;
+    int metric_;
+    uint32_t connectivity_;
+    uint32_t expansion_add_;
+    uint32_t expansion_search_;
+    uint64_t index_size_;
+    uint32_t null_bitmap_size_;
+    mutable ::PROTOBUF_NAMESPACE_ID::internal::CachedSize _cached_size_;
+  };
+  union { Impl_ _impl_; };
+  friend struct ::TableStruct_greptime_2fv1_2findex_2fvector_5findex_2eproto;
+};
+// -------------------------------------------------------------------
+
+class VectorIndexStats final :
+    public ::PROTOBUF_NAMESPACE_ID::Message /* @@protoc_insertion_point(class_definition:greptime.v1.index.VectorIndexStats) */ {
+ public:
+  inline VectorIndexStats() : VectorIndexStats(nullptr) {}
+  ~VectorIndexStats() override;
+  explicit PROTOBUF_CONSTEXPR VectorIndexStats(::PROTOBUF_NAMESPACE_ID::internal::ConstantInitialized);
+
+  VectorIndexStats(const VectorIndexStats& from);
+  VectorIndexStats(VectorIndexStats&& from) noexcept
+    : VectorIndexStats() {
+    *this = ::std::move(from);
+  }
+
+  inline VectorIndexStats& operator=(const VectorIndexStats& from) {
+    CopyFrom(from);
+    return *this;
+  }
+  inline VectorIndexStats& operator=(VectorIndexStats&& 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 VectorIndexStats& default_instance() {
+    return *internal_default_instance();
+  }
+  static inline const VectorIndexStats* internal_default_instance() {
+    return reinterpret_cast<const VectorIndexStats*>(
+               &_VectorIndexStats_default_instance_);
+  }
+  static constexpr int kIndexInFileMessages =
+    1;
+
+  friend void swap(VectorIndexStats& a, VectorIndexStats& b) {
+    a.Swap(&b);
+  }
+  inline void Swap(VectorIndexStats* 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(VectorIndexStats* other) {
+    if (other == this) return;
+    GOOGLE_DCHECK(GetOwningArena() == other->GetOwningArena());
+    InternalSwap(other);
+  }
+
+  // implements Message ----------------------------------------------
+
+  VectorIndexStats* New(::PROTOBUF_NAMESPACE_ID::Arena* arena = nullptr) const final {
+    return CreateMaybeMessage<VectorIndexStats>(arena);
+  }
+  using ::PROTOBUF_NAMESPACE_ID::Message::CopyFrom;
+  void CopyFrom(const VectorIndexStats& from);
+  using ::PROTOBUF_NAMESPACE_ID::Message::MergeFrom;
+  void MergeFrom( const VectorIndexStats& from) {
+    VectorIndexStats::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(VectorIndexStats* other);
+
+  private:
+  friend class ::PROTOBUF_NAMESPACE_ID::internal::AnyMetadata;
+  static ::PROTOBUF_NAMESPACE_ID::StringPiece FullMessageName() {
+    return "greptime.v1.index.VectorIndexStats";
+  }
+  protected:
+  explicit VectorIndexStats(::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 {
+    kTotalRowCountFieldNumber = 1,
+    kIndexedRowCountFieldNumber = 2,
+    kNullCountFieldNumber = 3,
+  };
+  // uint64 total_row_count = 1;
+  void clear_total_row_count();
+  uint64_t total_row_count() const;
+  void set_total_row_count(uint64_t value);
+  private:
+  uint64_t _internal_total_row_count() const;
+  void _internal_set_total_row_count(uint64_t value);
+  public:
+
+  // uint64 indexed_row_count = 2;
+  void clear_indexed_row_count();
+  uint64_t indexed_row_count() const;
+  void set_indexed_row_count(uint64_t value);
+  private:
+  uint64_t _internal_indexed_row_count() const;
+  void _internal_set_indexed_row_count(uint64_t value);
+  public:
+
+  // uint64 null_count = 3;
+  void clear_null_count();
+  uint64_t null_count() const;
+  void set_null_count(uint64_t value);
+  private:
+  uint64_t _internal_null_count() const;
+  void _internal_set_null_count(uint64_t value);
+  public:
+
+  // @@protoc_insertion_point(class_scope:greptime.v1.index.VectorIndexStats)
+ private:
+  class _Internal;
+
+  template <typename T> friend class ::PROTOBUF_NAMESPACE_ID::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
+  struct Impl_ {
+    uint64_t total_row_count_;
+    uint64_t indexed_row_count_;
+    uint64_t null_count_;
+    mutable ::PROTOBUF_NAMESPACE_ID::internal::CachedSize _cached_size_;
+  };
+  union { Impl_ _impl_; };
+  friend struct ::TableStruct_greptime_2fv1_2findex_2fvector_5findex_2eproto;
+};
+// ===================================================================
+
+
+// ===================================================================
+
+#ifdef __GNUC__
+  #pragma GCC diagnostic push
+  #pragma GCC diagnostic ignored "-Wstrict-aliasing"
+#endif  // __GNUC__
+// VectorIndexMeta
+
+// .greptime.v1.index.VectorIndexEngine engine = 1;
+inline void VectorIndexMeta::clear_engine() {
+  _impl_.engine_ = 0;
+}
+inline ::greptime::v1::index::VectorIndexEngine VectorIndexMeta::_internal_engine() const {
+  return static_cast< ::greptime::v1::index::VectorIndexEngine >(_impl_.engine_);
+}
+inline ::greptime::v1::index::VectorIndexEngine VectorIndexMeta::engine() const {
+  // @@protoc_insertion_point(field_get:greptime.v1.index.VectorIndexMeta.engine)
+  return _internal_engine();
+}
+inline void VectorIndexMeta::_internal_set_engine(::greptime::v1::index::VectorIndexEngine value) {
+  
+  _impl_.engine_ = value;
+}
+inline void VectorIndexMeta::set_engine(::greptime::v1::index::VectorIndexEngine value) {
+  _internal_set_engine(value);
+  // @@protoc_insertion_point(field_set:greptime.v1.index.VectorIndexMeta.engine)
+}
+
+// uint32 dim = 2;
+inline void VectorIndexMeta::clear_dim() {
+  _impl_.dim_ = 0u;
+}
+inline uint32_t VectorIndexMeta::_internal_dim() const {
+  return _impl_.dim_;
+}
+inline uint32_t VectorIndexMeta::dim() const {
+  // @@protoc_insertion_point(field_get:greptime.v1.index.VectorIndexMeta.dim)
+  return _internal_dim();
+}
+inline void VectorIndexMeta::_internal_set_dim(uint32_t value) {
+  
+  _impl_.dim_ = value;
+}
+inline void VectorIndexMeta::set_dim(uint32_t value) {
+  _internal_set_dim(value);
+  // @@protoc_insertion_point(field_set:greptime.v1.index.VectorIndexMeta.dim)
+}
+
+// .greptime.v1.index.VectorDistanceMetric metric = 3;
+inline void VectorIndexMeta::clear_metric() {
+  _impl_.metric_ = 0;
+}
+inline ::greptime::v1::index::VectorDistanceMetric VectorIndexMeta::_internal_metric() const {
+  return static_cast< ::greptime::v1::index::VectorDistanceMetric >(_impl_.metric_);
+}
+inline ::greptime::v1::index::VectorDistanceMetric VectorIndexMeta::metric() const {
+  // @@protoc_insertion_point(field_get:greptime.v1.index.VectorIndexMeta.metric)
+  return _internal_metric();
+}
+inline void VectorIndexMeta::_internal_set_metric(::greptime::v1::index::VectorDistanceMetric value) {
+  
+  _impl_.metric_ = value;
+}
+inline void VectorIndexMeta::set_metric(::greptime::v1::index::VectorDistanceMetric value) {
+  _internal_set_metric(value);
+  // @@protoc_insertion_point(field_set:greptime.v1.index.VectorIndexMeta.metric)
+}
+
+// uint32 connectivity = 4;
+inline void VectorIndexMeta::clear_connectivity() {
+  _impl_.connectivity_ = 0u;
+}
+inline uint32_t VectorIndexMeta::_internal_connectivity() const {
+  return _impl_.connectivity_;
+}
+inline uint32_t VectorIndexMeta::connectivity() const {
+  // @@protoc_insertion_point(field_get:greptime.v1.index.VectorIndexMeta.connectivity)
+  return _internal_connectivity();
+}
+inline void VectorIndexMeta::_internal_set_connectivity(uint32_t value) {
+  
+  _impl_.connectivity_ = value;
+}
+inline void VectorIndexMeta::set_connectivity(uint32_t value) {
+  _internal_set_connectivity(value);
+  // @@protoc_insertion_point(field_set:greptime.v1.index.VectorIndexMeta.connectivity)
+}
+
+// uint32 expansion_add = 5;
+inline void VectorIndexMeta::clear_expansion_add() {
+  _impl_.expansion_add_ = 0u;
+}
+inline uint32_t VectorIndexMeta::_internal_expansion_add() const {
+  return _impl_.expansion_add_;
+}
+inline uint32_t VectorIndexMeta::expansion_add() const {
+  // @@protoc_insertion_point(field_get:greptime.v1.index.VectorIndexMeta.expansion_add)
+  return _internal_expansion_add();
+}
+inline void VectorIndexMeta::_internal_set_expansion_add(uint32_t value) {
+  
+  _impl_.expansion_add_ = value;
+}
+inline void VectorIndexMeta::set_expansion_add(uint32_t value) {
+  _internal_set_expansion_add(value);
+  // @@protoc_insertion_point(field_set:greptime.v1.index.VectorIndexMeta.expansion_add)
+}
+
+// uint32 expansion_search = 6;
+inline void VectorIndexMeta::clear_expansion_search() {
+  _impl_.expansion_search_ = 0u;
+}
+inline uint32_t VectorIndexMeta::_internal_expansion_search() const {
+  return _impl_.expansion_search_;
+}
+inline uint32_t VectorIndexMeta::expansion_search() const {
+  // @@protoc_insertion_point(field_get:greptime.v1.index.VectorIndexMeta.expansion_search)
+  return _internal_expansion_search();
+}
+inline void VectorIndexMeta::_internal_set_expansion_search(uint32_t value) {
+  
+  _impl_.expansion_search_ = value;
+}
+inline void VectorIndexMeta::set_expansion_search(uint32_t value) {
+  _internal_set_expansion_search(value);
+  // @@protoc_insertion_point(field_set:greptime.v1.index.VectorIndexMeta.expansion_search)
+}
+
+// uint32 null_bitmap_size = 7;
+inline void VectorIndexMeta::clear_null_bitmap_size() {
+  _impl_.null_bitmap_size_ = 0u;
+}
+inline uint32_t VectorIndexMeta::_internal_null_bitmap_size() const {
+  return _impl_.null_bitmap_size_;
+}
+inline uint32_t VectorIndexMeta::null_bitmap_size() const {
+  // @@protoc_insertion_point(field_get:greptime.v1.index.VectorIndexMeta.null_bitmap_size)
+  return _internal_null_bitmap_size();
+}
+inline void VectorIndexMeta::_internal_set_null_bitmap_size(uint32_t value) {
+  
+  _impl_.null_bitmap_size_ = value;
+}
+inline void VectorIndexMeta::set_null_bitmap_size(uint32_t value) {
+  _internal_set_null_bitmap_size(value);
+  // @@protoc_insertion_point(field_set:greptime.v1.index.VectorIndexMeta.null_bitmap_size)
+}
+
+// uint64 index_size = 8;
+inline void VectorIndexMeta::clear_index_size() {
+  _impl_.index_size_ = uint64_t{0u};
+}
+inline uint64_t VectorIndexMeta::_internal_index_size() const {
+  return _impl_.index_size_;
+}
+inline uint64_t VectorIndexMeta::index_size() const {
+  // @@protoc_insertion_point(field_get:greptime.v1.index.VectorIndexMeta.index_size)
+  return _internal_index_size();
+}
+inline void VectorIndexMeta::_internal_set_index_size(uint64_t value) {
+  
+  _impl_.index_size_ = value;
+}
+inline void VectorIndexMeta::set_index_size(uint64_t value) {
+  _internal_set_index_size(value);
+  // @@protoc_insertion_point(field_set:greptime.v1.index.VectorIndexMeta.index_size)
+}
+
+// .greptime.v1.index.VectorIndexStats stats = 9;
+inline bool VectorIndexMeta::_internal_has_stats() const {
+  return this != internal_default_instance() && _impl_.stats_ != nullptr;
+}
+inline bool VectorIndexMeta::has_stats() const {
+  return _internal_has_stats();
+}
+inline void VectorIndexMeta::clear_stats() {
+  if (GetArenaForAllocation() == nullptr && _impl_.stats_ != nullptr) {
+    delete _impl_.stats_;
+  }
+  _impl_.stats_ = nullptr;
+}
+inline const ::greptime::v1::index::VectorIndexStats& VectorIndexMeta::_internal_stats() const {
+  const ::greptime::v1::index::VectorIndexStats* p = _impl_.stats_;
+  return p != nullptr ? *p : reinterpret_cast<const ::greptime::v1::index::VectorIndexStats&>(
+      ::greptime::v1::index::_VectorIndexStats_default_instance_);
+}
+inline const ::greptime::v1::index::VectorIndexStats& VectorIndexMeta::stats() const {
+  // @@protoc_insertion_point(field_get:greptime.v1.index.VectorIndexMeta.stats)
+  return _internal_stats();
+}
+inline void VectorIndexMeta::unsafe_arena_set_allocated_stats(
+    ::greptime::v1::index::VectorIndexStats* stats) {
+  if (GetArenaForAllocation() == nullptr) {
+    delete reinterpret_cast<::PROTOBUF_NAMESPACE_ID::MessageLite*>(_impl_.stats_);
+  }
+  _impl_.stats_ = stats;
+  if (stats) {
+    
+  } else {
+    
+  }
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:greptime.v1.index.VectorIndexMeta.stats)
+}
+inline ::greptime::v1::index::VectorIndexStats* VectorIndexMeta::release_stats() {
+  
+  ::greptime::v1::index::VectorIndexStats* temp = _impl_.stats_;
+  _impl_.stats_ = 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::index::VectorIndexStats* VectorIndexMeta::unsafe_arena_release_stats() {
+  // @@protoc_insertion_point(field_release:greptime.v1.index.VectorIndexMeta.stats)
+  
+  ::greptime::v1::index::VectorIndexStats* temp = _impl_.stats_;
+  _impl_.stats_ = nullptr;
+  return temp;
+}
+inline ::greptime::v1::index::VectorIndexStats* VectorIndexMeta::_internal_mutable_stats() {
+  
+  if (_impl_.stats_ == nullptr) {
+    auto* p = CreateMaybeMessage<::greptime::v1::index::VectorIndexStats>(GetArenaForAllocation());
+    _impl_.stats_ = p;
+  }
+  return _impl_.stats_;
+}
+inline ::greptime::v1::index::VectorIndexStats* VectorIndexMeta::mutable_stats() {
+  ::greptime::v1::index::VectorIndexStats* _msg = _internal_mutable_stats();
+  // @@protoc_insertion_point(field_mutable:greptime.v1.index.VectorIndexMeta.stats)
+  return _msg;
+}
+inline void VectorIndexMeta::set_allocated_stats(::greptime::v1::index::VectorIndexStats* stats) {
+  ::PROTOBUF_NAMESPACE_ID::Arena* message_arena = GetArenaForAllocation();
+  if (message_arena == nullptr) {
+    delete _impl_.stats_;
+  }
+  if (stats) {
+    ::PROTOBUF_NAMESPACE_ID::Arena* submessage_arena =
+        ::PROTOBUF_NAMESPACE_ID::Arena::InternalGetOwningArena(stats);
+    if (message_arena != submessage_arena) {
+      stats = ::PROTOBUF_NAMESPACE_ID::internal::GetOwnedMessage(
+          message_arena, stats, submessage_arena);
+    }
+    
+  } else {
+    
+  }
+  _impl_.stats_ = stats;
+  // @@protoc_insertion_point(field_set_allocated:greptime.v1.index.VectorIndexMeta.stats)
+}
+
+// -------------------------------------------------------------------
+
+// VectorIndexStats
+
+// uint64 total_row_count = 1;
+inline void VectorIndexStats::clear_total_row_count() {
+  _impl_.total_row_count_ = uint64_t{0u};
+}
+inline uint64_t VectorIndexStats::_internal_total_row_count() const {
+  return _impl_.total_row_count_;
+}
+inline uint64_t VectorIndexStats::total_row_count() const {
+  // @@protoc_insertion_point(field_get:greptime.v1.index.VectorIndexStats.total_row_count)
+  return _internal_total_row_count();
+}
+inline void VectorIndexStats::_internal_set_total_row_count(uint64_t value) {
+  
+  _impl_.total_row_count_ = value;
+}
+inline void VectorIndexStats::set_total_row_count(uint64_t value) {
+  _internal_set_total_row_count(value);
+  // @@protoc_insertion_point(field_set:greptime.v1.index.VectorIndexStats.total_row_count)
+}
+
+// uint64 indexed_row_count = 2;
+inline void VectorIndexStats::clear_indexed_row_count() {
+  _impl_.indexed_row_count_ = uint64_t{0u};
+}
+inline uint64_t VectorIndexStats::_internal_indexed_row_count() const {
+  return _impl_.indexed_row_count_;
+}
+inline uint64_t VectorIndexStats::indexed_row_count() const {
+  // @@protoc_insertion_point(field_get:greptime.v1.index.VectorIndexStats.indexed_row_count)
+  return _internal_indexed_row_count();
+}
+inline void VectorIndexStats::_internal_set_indexed_row_count(uint64_t value) {
+  
+  _impl_.indexed_row_count_ = value;
+}
+inline void VectorIndexStats::set_indexed_row_count(uint64_t value) {
+  _internal_set_indexed_row_count(value);
+  // @@protoc_insertion_point(field_set:greptime.v1.index.VectorIndexStats.indexed_row_count)
+}
+
+// uint64 null_count = 3;
+inline void VectorIndexStats::clear_null_count() {
+  _impl_.null_count_ = uint64_t{0u};
+}
+inline uint64_t VectorIndexStats::_internal_null_count() const {
+  return _impl_.null_count_;
+}
+inline uint64_t VectorIndexStats::null_count() const {
+  // @@protoc_insertion_point(field_get:greptime.v1.index.VectorIndexStats.null_count)
+  return _internal_null_count();
+}
+inline void VectorIndexStats::_internal_set_null_count(uint64_t value) {
+  
+  _impl_.null_count_ = value;
+}
+inline void VectorIndexStats::set_null_count(uint64_t value) {
+  _internal_set_null_count(value);
+  // @@protoc_insertion_point(field_set:greptime.v1.index.VectorIndexStats.null_count)
+}
+
+#ifdef __GNUC__
+  #pragma GCC diagnostic pop
+#endif  // __GNUC__
+// -------------------------------------------------------------------
+
+
+// @@protoc_insertion_point(namespace_scope)
+
+}  // namespace index
+}  // namespace v1
+}  // namespace greptime
+
+PROTOBUF_NAMESPACE_OPEN
+
+template <> struct is_proto_enum< ::greptime::v1::index::VectorIndexEngine> : ::std::true_type {};
+template <>
+inline const EnumDescriptor* GetEnumDescriptor< ::greptime::v1::index::VectorIndexEngine>() {
+  return ::greptime::v1::index::VectorIndexEngine_descriptor();
+}
+template <> struct is_proto_enum< ::greptime::v1::index::VectorDistanceMetric> : ::std::true_type {};
+template <>
+inline const EnumDescriptor* GetEnumDescriptor< ::greptime::v1::index::VectorDistanceMetric>() {
+  return ::greptime::v1::index::VectorDistanceMetric_descriptor();
+}
+
+PROTOBUF_NAMESPACE_CLOSE
+
+// @@protoc_insertion_point(global_scope)
+
+#include <google/protobuf/port_undef.inc>
+#endif  // GOOGLE_PROTOBUF_INCLUDED_GOOGLE_PROTOBUF_INCLUDED_greptime_2fv1_2findex_2fvector_5findex_2eproto

go/greptime/v1/index/vector_index.pb.go

@@ -0,0 +1,460 @@
+// 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.
+
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.28.1
+// 	protoc        v3.21.6
+// source: greptime/v1/index/vector_index.proto
+
+package index
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+// Vector index engine types.
+type VectorIndexEngine int32
+
+const (
+	VectorIndexEngine_VECTOR_INDEX_ENGINE_USEARCH VectorIndexEngine = 0
+)
+
+// Enum value maps for VectorIndexEngine.
+var (
+	VectorIndexEngine_name = map[int32]string{
+		0: "VECTOR_INDEX_ENGINE_USEARCH",
+	}
+	VectorIndexEngine_value = map[string]int32{
+		"VECTOR_INDEX_ENGINE_USEARCH": 0,
+	}
+)
+
+func (x VectorIndexEngine) Enum() *VectorIndexEngine {
+	p := new(VectorIndexEngine)
+	*p = x
+	return p
+}
+
+func (x VectorIndexEngine) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (VectorIndexEngine) Descriptor() protoreflect.EnumDescriptor {
+	return file_greptime_v1_index_vector_index_proto_enumTypes[0].Descriptor()
+}
+
+func (VectorIndexEngine) Type() protoreflect.EnumType {
+	return &file_greptime_v1_index_vector_index_proto_enumTypes[0]
+}
+
+func (x VectorIndexEngine) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use VectorIndexEngine.Descriptor instead.
+func (VectorIndexEngine) EnumDescriptor() ([]byte, []int) {
+	return file_greptime_v1_index_vector_index_proto_rawDescGZIP(), []int{0}
+}
+
+// Vector distance metrics.
+type VectorDistanceMetric int32
+
+const (
+	VectorDistanceMetric_VECTOR_DISTANCE_METRIC_L2SQ          VectorDistanceMetric = 0
+	VectorDistanceMetric_VECTOR_DISTANCE_METRIC_COSINE        VectorDistanceMetric = 1
+	VectorDistanceMetric_VECTOR_DISTANCE_METRIC_INNER_PRODUCT VectorDistanceMetric = 2
+)
+
+// Enum value maps for VectorDistanceMetric.
+var (
+	VectorDistanceMetric_name = map[int32]string{
+		0: "VECTOR_DISTANCE_METRIC_L2SQ",
+		1: "VECTOR_DISTANCE_METRIC_COSINE",
+		2: "VECTOR_DISTANCE_METRIC_INNER_PRODUCT",
+	}
+	VectorDistanceMetric_value = map[string]int32{
+		"VECTOR_DISTANCE_METRIC_L2SQ":          0,
+		"VECTOR_DISTANCE_METRIC_COSINE":        1,
+		"VECTOR_DISTANCE_METRIC_INNER_PRODUCT": 2,
+	}
+)
+
+func (x VectorDistanceMetric) Enum() *VectorDistanceMetric {
+	p := new(VectorDistanceMetric)
+	*p = x
+	return p
+}
+
+func (x VectorDistanceMetric) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (VectorDistanceMetric) Descriptor() protoreflect.EnumDescriptor {
+	return file_greptime_v1_index_vector_index_proto_enumTypes[1].Descriptor()
+}
+
+func (VectorDistanceMetric) Type() protoreflect.EnumType {
+	return &file_greptime_v1_index_vector_index_proto_enumTypes[1]
+}
+
+func (x VectorDistanceMetric) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use VectorDistanceMetric.Descriptor instead.
+func (VectorDistanceMetric) EnumDescriptor() ([]byte, []int) {
+	return file_greptime_v1_index_vector_index_proto_rawDescGZIP(), []int{1}
+}
+
+// Metadata for a vector index blob (stored as footer).
+type VectorIndexMeta struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Index engine type.
+	Engine VectorIndexEngine `protobuf:"varint,1,opt,name=engine,proto3,enum=greptime.v1.index.VectorIndexEngine" json:"engine,omitempty"`
+	// Vector dimension.
+	Dim uint32 `protobuf:"varint,2,opt,name=dim,proto3" json:"dim,omitempty"`
+	// Distance metric.
+	Metric VectorDistanceMetric `protobuf:"varint,3,opt,name=metric,proto3,enum=greptime.v1.index.VectorDistanceMetric" json:"metric,omitempty"`
+	// HNSW connectivity parameter.
+	Connectivity uint32 `protobuf:"varint,4,opt,name=connectivity,proto3" json:"connectivity,omitempty"`
+	// HNSW expansion factor during index construction.
+	ExpansionAdd uint32 `protobuf:"varint,5,opt,name=expansion_add,json=expansionAdd,proto3" json:"expansion_add,omitempty"`
+	// HNSW expansion factor during search.
+	ExpansionSearch uint32 `protobuf:"varint,6,opt,name=expansion_search,json=expansionSearch,proto3" json:"expansion_search,omitempty"`
+	// Byte length of the null bitmap (RoaringBitmap serialized).
+	NullBitmapSize uint32 `protobuf:"varint,7,opt,name=null_bitmap_size,json=nullBitmapSize,proto3" json:"null_bitmap_size,omitempty"`
+	// Byte length of the vector index data (engine-specific serialized format).
+	IndexSize uint64 `protobuf:"varint,8,opt,name=index_size,json=indexSize,proto3" json:"index_size,omitempty"`
+	// Statistics about the vector index.
+	Stats *VectorIndexStats `protobuf:"bytes,9,opt,name=stats,proto3" json:"stats,omitempty"`
+}
+
+func (x *VectorIndexMeta) Reset() {
+	*x = VectorIndexMeta{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_greptime_v1_index_vector_index_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *VectorIndexMeta) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*VectorIndexMeta) ProtoMessage() {}
+
+func (x *VectorIndexMeta) ProtoReflect() protoreflect.Message {
+	mi := &file_greptime_v1_index_vector_index_proto_msgTypes[0]
+	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 VectorIndexMeta.ProtoReflect.Descriptor instead.
+func (*VectorIndexMeta) Descriptor() ([]byte, []int) {
+	return file_greptime_v1_index_vector_index_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *VectorIndexMeta) GetEngine() VectorIndexEngine {
+	if x != nil {
+		return x.Engine
+	}
+	return VectorIndexEngine_VECTOR_INDEX_ENGINE_USEARCH
+}
+
+func (x *VectorIndexMeta) GetDim() uint32 {
+	if x != nil {
+		return x.Dim
+	}
+	return 0
+}
+
+func (x *VectorIndexMeta) GetMetric() VectorDistanceMetric {
+	if x != nil {
+		return x.Metric
+	}
+	return VectorDistanceMetric_VECTOR_DISTANCE_METRIC_L2SQ
+}
+
+func (x *VectorIndexMeta) GetConnectivity() uint32 {
+	if x != nil {
+		return x.Connectivity
+	}
+	return 0
+}
+
+func (x *VectorIndexMeta) GetExpansionAdd() uint32 {
+	if x != nil {
+		return x.ExpansionAdd
+	}
+	return 0
+}
+
+func (x *VectorIndexMeta) GetExpansionSearch() uint32 {
+	if x != nil {
+		return x.ExpansionSearch
+	}
+	return 0
+}
+
+func (x *VectorIndexMeta) GetNullBitmapSize() uint32 {
+	if x != nil {
+		return x.NullBitmapSize
+	}
+	return 0
+}
+
+func (x *VectorIndexMeta) GetIndexSize() uint64 {
+	if x != nil {
+		return x.IndexSize
+	}
+	return 0
+}
+
+func (x *VectorIndexMeta) GetStats() *VectorIndexStats {
+	if x != nil {
+		return x.Stats
+	}
+	return nil
+}
+
+// Statistics for a vector index.
+type VectorIndexStats struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Total number of rows in the SST.
+	TotalRowCount uint64 `protobuf:"varint,1,opt,name=total_row_count,json=totalRowCount,proto3" json:"total_row_count,omitempty"`
+	// Number of rows with valid vectors (indexed).
+	IndexedRowCount uint64 `protobuf:"varint,2,opt,name=indexed_row_count,json=indexedRowCount,proto3" json:"indexed_row_count,omitempty"`
+	// Number of null vectors.
+	NullCount uint64 `protobuf:"varint,3,opt,name=null_count,json=nullCount,proto3" json:"null_count,omitempty"`
+}
+
+func (x *VectorIndexStats) Reset() {
+	*x = VectorIndexStats{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_greptime_v1_index_vector_index_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *VectorIndexStats) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*VectorIndexStats) ProtoMessage() {}
+
+func (x *VectorIndexStats) ProtoReflect() protoreflect.Message {
+	mi := &file_greptime_v1_index_vector_index_proto_msgTypes[1]
+	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 VectorIndexStats.ProtoReflect.Descriptor instead.
+func (*VectorIndexStats) Descriptor() ([]byte, []int) {
+	return file_greptime_v1_index_vector_index_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *VectorIndexStats) GetTotalRowCount() uint64 {
+	if x != nil {
+		return x.TotalRowCount
+	}
+	return 0
+}
+
+func (x *VectorIndexStats) GetIndexedRowCount() uint64 {
+	if x != nil {
+		return x.IndexedRowCount
+	}
+	return 0
+}
+
+func (x *VectorIndexStats) GetNullCount() uint64 {
+	if x != nil {
+		return x.NullCount
+	}
+	return 0
+}
+
+var File_greptime_v1_index_vector_index_proto protoreflect.FileDescriptor
+
+var file_greptime_v1_index_vector_index_proto_rawDesc = []byte{
+	0x0a, 0x24, 0x67, 0x72, 0x65, 0x70, 0x74, 0x69, 0x6d, 0x65, 0x2f, 0x76, 0x31, 0x2f, 0x69, 0x6e,
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+	0x6f, 0x33,
+}
+
+var (
+	file_greptime_v1_index_vector_index_proto_rawDescOnce sync.Once
+	file_greptime_v1_index_vector_index_proto_rawDescData = file_greptime_v1_index_vector_index_proto_rawDesc
+)
+
+func file_greptime_v1_index_vector_index_proto_rawDescGZIP() []byte {
+	file_greptime_v1_index_vector_index_proto_rawDescOnce.Do(func() {
+		file_greptime_v1_index_vector_index_proto_rawDescData = protoimpl.X.CompressGZIP(file_greptime_v1_index_vector_index_proto_rawDescData)
+	})
+	return file_greptime_v1_index_vector_index_proto_rawDescData
+}
+
+var file_greptime_v1_index_vector_index_proto_enumTypes = make([]protoimpl.EnumInfo, 2)
+var file_greptime_v1_index_vector_index_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
+var file_greptime_v1_index_vector_index_proto_goTypes = []interface{}{
+	(VectorIndexEngine)(0),    // 0: greptime.v1.index.VectorIndexEngine
+	(VectorDistanceMetric)(0), // 1: greptime.v1.index.VectorDistanceMetric
+	(*VectorIndexMeta)(nil),   // 2: greptime.v1.index.VectorIndexMeta
+	(*VectorIndexStats)(nil),  // 3: greptime.v1.index.VectorIndexStats
+}
+var file_greptime_v1_index_vector_index_proto_depIdxs = []int32{
+	0, // 0: greptime.v1.index.VectorIndexMeta.engine:type_name -> greptime.v1.index.VectorIndexEngine
+	1, // 1: greptime.v1.index.VectorIndexMeta.metric:type_name -> greptime.v1.index.VectorDistanceMetric
+	3, // 2: greptime.v1.index.VectorIndexMeta.stats:type_name -> greptime.v1.index.VectorIndexStats
+	3, // [3:3] is the sub-list for method output_type
+	3, // [3:3] is the sub-list for method input_type
+	3, // [3:3] is the sub-list for extension type_name
+	3, // [3:3] is the sub-list for extension extendee
+	0, // [0:3] is the sub-list for field type_name
+}
+
+func init() { file_greptime_v1_index_vector_index_proto_init() }
+func file_greptime_v1_index_vector_index_proto_init() {
+	if File_greptime_v1_index_vector_index_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_greptime_v1_index_vector_index_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*VectorIndexMeta); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_greptime_v1_index_vector_index_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*VectorIndexStats); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_greptime_v1_index_vector_index_proto_rawDesc,
+			NumEnums:      2,
+			NumMessages:   2,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_greptime_v1_index_vector_index_proto_goTypes,
+		DependencyIndexes: file_greptime_v1_index_vector_index_proto_depIdxs,
+		EnumInfos:         file_greptime_v1_index_vector_index_proto_enumTypes,
+		MessageInfos:      file_greptime_v1_index_vector_index_proto_msgTypes,
+	}.Build()
+	File_greptime_v1_index_vector_index_proto = out.File
+	file_greptime_v1_index_vector_index_proto_rawDesc = nil
+	file_greptime_v1_index_vector_index_proto_goTypes = nil
+	file_greptime_v1_index_vector_index_proto_depIdxs = nil
+}

proto/greptime/v1/index/vector_index.proto

@@ -0,0 +1,73 @@
+// 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.
+
+syntax = "proto3";
+
+package greptime.v1.index;
+
+option go_package = "github.com/GreptimeTeam/greptime-proto/go/greptime/v1/index";
+
+// Vector index engine types.
+enum VectorIndexEngine {
+  VECTOR_INDEX_ENGINE_USEARCH = 0;
+}
+
+// Vector distance metrics.
+enum VectorDistanceMetric {
+  VECTOR_DISTANCE_METRIC_L2SQ = 0;
+  VECTOR_DISTANCE_METRIC_COSINE = 1;
+  VECTOR_DISTANCE_METRIC_INNER_PRODUCT = 2;
+}
+
+// Metadata for a vector index blob (stored as footer).
+message VectorIndexMeta {
+  // Index engine type.
+  VectorIndexEngine engine = 1;
+
+  // Vector dimension.
+  uint32 dim = 2;
+
+  // Distance metric.
+  VectorDistanceMetric metric = 3;
+
+  // HNSW connectivity parameter.
+  uint32 connectivity = 4;
+
+  // HNSW expansion factor during index construction.
+  uint32 expansion_add = 5;
+
+  // HNSW expansion factor during search.
+  uint32 expansion_search = 6;
+
+  // Byte length of the null bitmap (RoaringBitmap serialized).
+  uint32 null_bitmap_size = 7;
+
+  // Byte length of the vector index data (engine-specific serialized format).
+  uint64 index_size = 8;
+
+  // Statistics about the vector index.
+  VectorIndexStats stats = 9;
+}
+
+// Statistics for a vector index.
+message VectorIndexStats {
+  // Total number of rows in the SST.
+  uint64 total_row_count = 1;
+
+  // Number of rows with valid vectors (indexed).
+  uint64 indexed_row_count = 2;
+
+  // Number of null vectors.
+  uint64 null_count = 3;
+}