create partition table doesn't check the unsigned option

[aytrack]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

create table pK_001 (a tinyint(20) unsigned) partition by range (a) (partition p0 values less than (-1));

2. What did you expect to see? (Required)

mysql > create table pK_001 (a tinyint(20) unsigned) partition by range (a) (partition p0 values less than (-1));
(1563, 'Partition constant is out of partition function domain')

3. What did you see instead (Required)

mysql root@127.0.0.1:test> create table pK_001 (a tinyint(20) unsigned) partition by range (a) (partition p0 values less than (-1));
Query OK, 0 rows affected
Time: 0.011s

4. What is your TiDB version? (Required)

master: 9e3c064
release-4.0: f055086
release-5.0rc: d3ac2c0

[xiongjiwei]

/assign

[ti-srebot]

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