feat: add bloom filter meta (#210)

Signed-off-by: Zhenchi <zhongzc_arch@outlook.com>

proto/greptime/v1/index/bloom_filter.proto

@@ -0,0 +1,52 @@
+// 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";
+
+// BloomFilterMeta defines the metadata for a bloom filter.
+message BloomFilterMeta {
+    // The number of rows per segment.
+    uint64 rows_per_segment = 1;
+
+    // The number of segments.
+    uint64 segment_count = 2;
+
+    // The number of total rows.
+    uint64 row_count = 3;
+
+    // The size of the bloom filter in bytes excluding the metadata.
+    uint64 bloom_filter_size = 4;
+
+    // The indices to the bloom filter location of each segment.
+    repeated uint64 segment_loc_indices = 5;
+
+    // The bloom filter locations.
+    repeated BloomFilterLoc bloom_filter_locs = 6;
+}
+
+// BloomFilterLoc defines the location of a bloom filter.
+message BloomFilterLoc {
+    // The byte offset of the bloom filter data.
+    uint64 offset = 1;
+
+    // The size of the bloom filter data.
+    uint64 size = 2;
+
+    // The number of elements in the bloom filter.
+    uint64 element_count = 3;
+}

proto/greptime/v1/index/inverted_index.proto

@@ -16,8 +16,6 @@ syntax = "proto3";
 
 package greptime.v1.index;
 
-option java_package = "io.greptime.v1.index";
-option java_outer_classname = "Index";
 option go_package = "github.com/GreptimeTeam/greptime-proto/go/greptime/v1/index";
 
 // InvertedIndexMetas defines the metadata for an inverted index