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HaiBo Li 9fbc1c7ee6 Support where/orderby/limit after “SHOW ALTER TABLE COLUMN“ syntax (#2380) 
Features：
1、Support WHERE/ORDER BY/LIMIT
2、Columns：TableName、CreatTime、FinishTime、State
3、Only “And” between conditions
4、TableName and State column only support "=" operator
5、CreateTime and FinishTime column support “=”,“>=”,"<=",">","<","!=" operators
6、CreateTime and FinishTime column support Date and DateTime string, eg:"2019-12-04" or "2019-12-04 17:18:00"

TestCase:
MySQL [haibotest]> show alter table column where State='FINISHED' and CreateTime > '2019-12-03' order by FinishTime desc limit 0,2;
+-------+---------------+---------------------+---------------------+---------------+---------+---------------+---------------+---------------+----------+------+----------+---------+
| JobId | TableName | CreateTime | FinishTime | IndexName | IndexId | OriginIndexId | SchemaVersion | TransactionId | State | Msg | Progress | Timeout |
+-------+---------------+---------------------+---------------------+---------------+---------+---------------+---------------+---------------+----------+------+----------+---------+
| 11134 | test_schema_2 | 2019-12-03 19:21:42 | 2019-12-03 19:22:11 | test_schema_2 | 11135 | 11059 | 1:192010000 | 3 | FINISHED | | N/A | 86400 |
| 11096 | test_schema_3 | 2019-12-03 19:21:31 | 2019-12-03 19:21:51 | test_schema_3 | 11097 | 11018 | 1:2063361382 | 2 | FINISHED | | N/A | 86400 |
+-------+---------------+---------------------+---------------------+---------------+---------+---------------+---------------+---------------+----------+------+----------+---------+
2 rows in set (0.00 sec)
2019-12-06 16:24:44 +08:00

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SHOW ALTER

Description

This statement is used to show the execution of various modification tasks currently under way. Grammar: SHOW ALTER [CLUSTER | TABLE [COLUMN | ROLLUP] [FROM db_name]];

Explain: TABLE COLUMN：Shows the task of alter table column. Support grammar [WHERE TableName|CreateTime|FinishTime|State] [ORDER BY] [LIMIT] TABLE ROLLUP: Shows the task of creating or deleting ROLLUP index If db_name is not specified, use the current default DB CLUSTER: Show the cluster operation related tasks (only administrators use! To be realized...

example

  1. Show the task execution of all modified columns of default DB SHOW ALTER TABLE COLUMN;

  2. Show the last task execution of modified columns of some table SHOW ALTER TABLE COLUMN WHERE TableName = "table1" ORDER BY CreateTime LIMIT 1;

  3. Show the execution of tasks to create or delete ROLLUP index for specified DB SHOW ALTER TABLE ROLLUP FROM example_db;

  4. Show cluster operations related tasks (only administrators use! To be realized... SHOW ALTER CLUSTER;

keyword

SHOW,ALTER