compasses commented on code in PR #11579:
URL: https://github.com/apache/doris/pull/11579#discussion_r945118529
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docs/zh-CN/docs/data-table/index/ngram-bloomfilter-index.md:
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@@ -0,0 +1,79 @@
+---
+{
+ "title": "NGram BloomFilter索引",
+ "language": "zh-CN"
+}
+---
+
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements. See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership. The ASF licenses this file
+to you 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.
+-->
+
+# Doris NGram BloomFilter索引及使用使用场景
+
+为了提升like的查询性能，增加了NGram BloomFilter索引，其实现主要参照了ClickHouse的ngrambf。
+
+## NGram BloomFilter创建
+
+表创建时指定：
+
+```sql
+CREATE TABLE `table3` (
+ `siteid` int(11) NULL DEFAULT "10" COMMENT "",
+ `citycode` smallint(6) NULL COMMENT "",
+ `username` varchar(32) NULL DEFAULT "" COMMENT "",
+ INDEX idx_ngrambf (`username`) USING NGRAM_BF (3,256) COMMENT 'username
ngram_bf index'
+) ENGINE=OLAP
+AGGREGATE KEY(`siteid`, `citycode`, `username`) COMMENT "OLAP"
+DISTRIBUTED BY HASH(`siteid`) BUCKETS 10
+PROPERTIES (
+"replication_num" = "1"
+);
+
+-- 其中(3,256)，分别表示ngram的个数和bloomfilter的字节数。
Review Comment:
ok, will add some suggest.
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