ddl: check expr restriction for hash partitioned table

[tiancaiamao]

What problem does this PR solve?

Mysql:

mysql> CREATE TABLE `bb` (`id` int(11) NOT NULL,  
 `ts` TIMESTAMP(6) DEFAULT CURRENT_TIMESTAMP(6), 
 `c` char(120) NOT NULL, 
 KEY `k_ts` (`ts`) ) PARTITION BY   hash(ts);

ERROR 1659 (HY000): Field 'ts' is of a not allowed type for this type of partitioning

TiDB:
success

What is changed and how it works?

The return type of the expr should be int, and only part of functions are allowed
Ref:
https://dev.mysql.com/doc/refman/8.0/en/partitioning-limitations-functions.html
https://dev.mysql.com/doc/refman/8.0/en/partitioning-hash.html

Check List

Tests

• Unit test

[tiancaiamao]

PTAL @crazycs520

[mahjonp]

/rebuild

[codecov]

Codecov Report

Merging #10273 into master will decrease coverage by 0.0085%.
The diff coverage is 70%.

@@               Coverage Diff                @@
##             master     #10273        +/-   ##
================================================
- Coverage   77.3592%   77.3506%   -0.0086%     
================================================
  Files           412        412                
  Lines         85717      85711         -6     
================================================
- Hits          66310      66298        -12     
- Misses        14373      14378         +5     
- Partials       5034       5035         +1

[crazycs520]

change https://github.com/pingcap/tidb/pull/10273/files#diff-07905132777c6fce0d33bf8f27a5dfaeR205 to

if s.Partition.Tp == model.PartitionTypeRange || s.Partition.Tp == model.PartitionTypeHash ?

[tiancaiamao]

@crazycs520 Hash partition doesn't have "partition by columns ... "

[jackysp]

LGTM

[crazycs520]

LGTM

[winkyao]

LGTM