Github user jiangxb1987 commented on a diff in the pull request:
https://github.com/apache/spark/pull/15717#discussion_r89053215
--- Diff:
sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4 ---
@@ -93,6 +93,8 @@ statement
SET TBLPROPERTIES tablePropertyList
#setTableProperties
| ALTER (TABLE | VIEW) tableIdentifier
UNSET TBLPROPERTIES (IF EXISTS)? tablePropertyList
#unsetTableProperties
+ | ALTER TABLE tableIdentifier
+ CHANGE COLUMN? expandColTypeList
#changeColumns
--- End diff --
I think we are following the HIVE DDL syntax by the following definition:
```
colType
: identifier dataType (COMMENT STRING)?
;
expandColTypeList
: expandColType (',' expandColType)*
;
expandColType
: identifier colType colPosition?
;
```
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