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New feature

1. Add shard_count, shard_func, shard_type support for TDBCTL. Users can customize shard count, functions and types on TSpider.
   Exmaple:

-- first, configure tdbctl routing
-- on tspider
set ddl_execute_by_ctl = on;
CREATE TABLE t1 (
    id INT PRIMARY KEY,
    vc VARCHAR(20)
)COMMENT 'shard_count "1", shard_func "crc32", shard_type "list"'

shard_count can be set with value 0, 1 or the number of backends. The default value is 0, meaning set shard_count as the number of backends.
WARNING, on current version, use customized shard_count = "1" could trigger bugs on DDL like ALTER TABLE and DROP TABLE.
shard_func can be set with crc32, crc32_ci, none, which means PARTITION BY LIST(crc32(key)), (crc32_ci(key)) and (key) respectively. The default value is crc32. Note: crc32_ci means crc32 case ignore.
shard_type can be choosen from list and range. The default value is list, which specifies partition type as list.

新功能

1. 增加了自定义shard_count, shard_func, shard_type支持，用户可以在TSpider中指定这些参数。
   例子:

-- first, configure tdbctl routing
-- on tspider
set ddl_execute_by_ctl = on;
CREATE TABLE t1 (
    id INT PRIMARY KEY,
    vc VARCHAR(20)
)COMMENT 'shard_count "1", shard_func "crc32", shard_type "list"'

shard_count 的值可以为0, 1或者当前所有后端总数. 默认值是0，表示使用当前所有后端。
WARNING, 在现在的版本中，自定义shard_count = "1"会在ALTER TABLE和DROP TABLE类的DDL上触发bug.。
shard_func 的值可以为crc32, crc32_ci, none, 分别表示PARTITION BY LIST(crc32(key)), (crc32_ci(key)) 和 (key). 默认值是crc32. 注意：crc32_ci表示忽略大小写的crc32。
shard_type 可以选择list或者range，默认值是list, 制定了分区类别是list。

(I have four backend TenDB nodes)

When I drop a non-exists table, the Tdbctl node distribute command to Tspider and TenDB nodes. It's reasonable to show the all failed message, but it's truncated in the console.

MySQL [mysql]> select * from mysql.servers;
+-------------+-----------+----+----------+----------+-------+--------+---------+-------+
| Server_name | Host | Db | Username | Password | Port | Socket | Wrapper | Owner |
+-------------+-----------+----+----------+----------+-------+--------+---------+-------+
| SPIDER0 | 127.0.0.1 | | mysql | mysql | 25000 | | SPIDER | |
| SPT0 | 127.0.0.1 | | mysql | mysql | 20000 | | mysql | |
| SPT1 | 127.0.0.1 | | mysql | mysql | 20001 | | mysql | |
| TDBCTL0 | 127.0.0.1 | | mysql | mysql | 26000 | | TDBCTL | |
+-------------+-----------+----+----------+----------+-------+--------+---------+-------+
4 rows in set (0.000 sec)

MySQL [mysql]> tdbctl flush routing;
Query OK, 0 rows affected, 1 warning (0.001 sec)

MySQL [mysql]> show warnings;
+---------+-------+---------------------------------------+
| Level | Code | Message |
+---------+-------+---------------------------------------+
| Warning | 12028 | routing sql is null, flush do nothing |
+---------+-------+---------------------------------------+
1 row in set (0.000 sec)