tidb/ast at 5f7abc84fe8302dfbdd30ef99b24c5af055ffaaf - tidb

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crazycs abe8fd9728 ddl: fix create partition table panic (#7059 )

## What have you changed? (mandatory)
Execute below SQL will panic
```SQL
create TABLE t1 (col1 int) partition by range(case when col1>0 then 10 else 20 end) (partition p0 values less than (2), partition p1 values less than (6));
```
TODO:
This PR just fix the panic, This SQL should return err:` ERROR 1564 (HY000): This partition function is not allowed`, issue[#7058](https://github.com/pingcap/tidb/issues/7058)

## What is the type of the changes? (mandatory)
Bug fix

## How has this PR been tested? (mandatory)

Unit test

## Does this PR affect documentation (docs/docs-cn) update? (mandatory)

No

## Does this PR affect tidb-ansible update? (mandatory)

No

## Does this PR need to be added to the release notes? (mandatory)

## Refer to a related PR or issue link (optional)

## Benchmark result if necessary (optional)

## Add a few positive/negative examples (optional)

2018-07-16 20:21:31 +08:00

ast.go

*: add schema version to the log (#6527 )

2018-05-18 14:01:47 +08:00

base.go

*: remove resolver.go (#4988 )

2017-11-10 14:42:10 +08:00

ddl_test.go

parser: Support add columns with parentheses (#5103 )

2017-11-16 15:07:48 +08:00

ddl.go

ddl:support alter table drop partition (#6460 )