hindex; update statement doc

hetu-docs/en/indexer/hindex-statements.md

@@ -11,7 +11,7 @@ To create an index you can run sql statements of the form:
 CREATE INDEX [ IF NOT EXISTS ] index_name
 USING [ BITMAP | BLOOM | BTREE | MINMAX ]
 ON tbl_name (col_name)
-WITH ( 'level' = ['STRIPE', 'PARTITION'], "bloom.fpp" = '0.001', "autoload" = true, [, …] )
+WITH ( 'level' = ['STRIPE', 'PARTITION'], "autoload" = true, "bloom.fpp" = '0.001', "bloom.mmapEnabled" = false, [, …] )
 WHERE predicate;
 ```
 
@@ -35,13 +35,22 @@ CREATE INDEX index_name USING bloom ON hive.schema.table (column1) WHERE p in (p
 
 ## SHOW
 
-To show all indexes or a specific index_name:
+To show the information of all the indices or a specific index by index_name.
+The information includes index name, user, table name, index columns, index type, index status, etc.
 
 ```roomsql
 SHOW INDEX;
 SHOW INDEX index_name;
 ```
 
+## UPDATE
+
+Update an existing index if the source table has been modified. You can check the status of the index with ```SHOW INDEX index_name```.
+
+```roomsql
+UPDATE INDEX index_name;
+```
+
 ## DROP
 
 To delete an index by name:
@@ -58,7 +67,7 @@ DROP INDEX index_name where p=part1;
 ```
 
 Note: dropped index will be removed from cache after a few seconds, so you may still see the next few queries still using the index.
-
+The index will be automatically dropped if the source table is dropped.
 
 ## Notes on resource usage
 

hetu-docs/zh/indexer/hindex-statements.md

@@ -10,7 +10,7 @@
 CREATE INDEX [ IF NOT EXISTS ] index_name
 USING [ BITMAP | BLOOM | BTREE | MINMAX ]
 ON tbl_name (col_name)
-WITH ( 'level' = ['STRIPE', 'PARTITION'], "bloom.fpp" = '0.001', "autoload" = true, [, …] )
+WITH ( 'level' = ['STRIPE', 'PARTITION'], "autoload" = true, "bloom.fpp" = '0.001', "bloom.mmapEnabled" = false, [, …] )
 WHERE predicate;
 ```
 
@@ -34,13 +34,22 @@ CREATE INDEX index_name USING bloom ON hive.schema.table (column1) WHERE p in (p
 
 ## SHOW
 
-显示所有索引或只根据名字显示一个索引：
+显示所有索引或根据名字显示特定索引的信息。
+信息包括索引名、用户、表名、索引列、索引类型、索引状态等。
 
 ```roomsql
 SHOW INDEX;
 SHOW INDEX index_name;
 ```
 
+## UPDATE
+
+如果源表已被修改，则更新现有索引。你可以用```SHOW INDEX index_name```检查索引的状态。
+
+```roomsql
+UPDATE INDEX index_name;
+```
+
 ## DROP
 
 根据名字删除一条索引：
@@ -56,6 +65,7 @@ DROP INDEX index_name where p=part1;
 ```
 
 删除的索引不会立即被从服务器的缓存中清除，直到下一次刷新缓存。刷新时间与设置的缓存加载延迟有关，通常在几秒钟左右。
+如果删除源表，索引将自动删除。
 
 ## 资源使用说明