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yangzhg c098178f7a [Index] Implements create drop show index syntax for bitmap index [#2487 ] (#2573 )

### create table with index 
```
CREATE TABLE table1
(
    siteid INT DEFAULT '10',
    citycode SMALLINT,
    username VARCHAR(32) DEFAULT '',
    pv BIGINT SUM DEFAULT '0',
    INDEX index_name [USING BITMAP] (siteid, citycode) COMMENT 'balabala'
)
AGGREGATE KEY(siteid, citycode, username)
DISTRIBUTED BY HASH(siteid) BUCKETS 10
PROPERTIES("replication_num" = "1");
```
### create index 
```
CREATE INDEX index_name  ON table1 (siteid, citycod) [USING BITMAP] COMMENT 'balabala';
or 
ALTER TABLE table1 ADD  INDEX index_name  [USING BITMAP] (siteid, citycod) COMMENT 'balabala';
```
### drop index
```
DROP INDEX index_name ON table1;
or
ALTER TABLE table1 DROP INDEX index_name 
```

### show index
```
SHOW INDEX[ES] FROM table1
```
output
```
+---------+-------------+-----------------+------------+---------+
| Table   | Index_name  | Column_name     | Index_type | Comment |
+---------+-------------+-----------------+------------+---------+
| table1  | index_name  | siteid,citycode | BITMAMP    | balabala|
+---------+-------------+-----------------+------------+---------+
```

2020-01-03 17:41:26 +08:00

986 B

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DROP INDEX

description

该语句用于从一个表中删除指定名称的索引，目前仅支持bitmap 索引
语法：
    DROP INDEX index_name ON [db_name.]table_name;

keyword

DROP,INDEX

986 B Raw Blame History

DROP INDEX

description

keyword

986 B

Raw Blame History