!6668 修复\h alter index提示信息缺少的问题

Merge pull request !6668 from levy5307/alter-index-help

doc/src/sgml/ref/alter_index.sgmlin

@@ -26,6 +26,10 @@ ALTER INDEX [ IF EXISTS ] index_name
     RENAME PARTITION partition_name TO new_partition_name;
 ALTER INDEX [ IF EXISTS ] index_name 
     MOVE PARTITION index_partition_name TABLESPACE new_tablespace;
+ALTER INDEX [ IF EXISTS ] index_name
+    INVISIBLE / VISIBLE
+ALTER INDEX [ IF EXISTS ] index_name
+    DISABLE / ENABLE
 </synopsis>
 </refsynopsisdiv>
 </refentry>

src/test/regress/expected/alter_index_disable.out

@@ -78,6 +78,31 @@ explain (costs off) select * from alter_index_disable where to_char(a) = '1';
          Index Cond: (((int4out(a))::character varying)::text = '1'::text)
 (4 rows)
 
+\h alter index
+Command:     ALTER INDEX
+Description: change the definition of an index
+Syntax:
+ALTER INDEX [ IF EXISTS ] index_name 
+    RENAME TO new_name;
+ALTER INDEX [ IF EXISTS ] index_name 
+    SET TABLESPACE tablespace_name;
+ALTER INDEX [ IF EXISTS ] index_name 
+    SET ( {storage_parameter = value} [, ... ] );
+ALTER INDEX [ IF EXISTS ] index_name 
+    RESET ( storage_parameter [, ... ] ) ;
+ALTER INDEX [ IF EXISTS ] index_name 
+    [ MODIFY PARTITION partition_name ] UNUSABLE;
+ALTER INDEX index_name 
+    REBUILD [ PARTITION partition_name ];
+ALTER INDEX [ IF EXISTS ] index_name 
+    RENAME PARTITION partition_name TO new_partition_name;
+ALTER INDEX [ IF EXISTS ] index_name 
+    MOVE PARTITION index_partition_name TABLESPACE new_tablespace;
+ALTER INDEX [ IF EXISTS ] index_name
+    INVISIBLE / VISIBLE
+ALTER INDEX [ IF EXISTS ] index_name
+    DISABLE / ENABLE
+
 drop procedure insert_data;
 drop index func_idx_alter_index_disable;
 drop table alter_index_disable cascade;

src/test/regress/sql/alter_index_disable.sql

@@ -38,6 +38,8 @@ select * from alter_index_disable where a = 10003 and b = 10003;
 alter index func_idx_alter_index_disable enable;
 explain (costs off) select * from alter_index_disable where to_char(a) = '1';
 
+\h alter index
+
 drop procedure insert_data;
 drop index func_idx_alter_index_disable;
 drop table alter_index_disable cascade;