cloud-fan commented on a change in pull request #27444: [SPARK-30614][SQL] The
native ALTER COLUMN syntax should change one property at a time
URL: https://github.com/apache/spark/pull/27444#discussion_r374455848
##########
File path:
sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4
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@@ -160,7 +160,13 @@ statement
UNSET TBLPROPERTIES (IF EXISTS)? tablePropertyList
#unsetTableProperties
| ALTER TABLE table=multipartIdentifier
(ALTER | CHANGE) COLUMN? column=multipartIdentifier
- (TYPE dataType)? commentSpec? colPosition?
#alterTableColumn
+ TYPE dataType
#alterTableColumnType
+ | ALTER TABLE table=multipartIdentifier
Review comment:
I'd like to make the syntax rule cleaner
```
ALTER TABLE table=multipartIdentifier
(ALTER | CHANGE) COLUMN? column=multipartIdentifier
alterColumnAction
alterColumnAction
: TYPE dataType
| commentSpec
| colPosition
| setOrDrop=(SET | DROP) NOT NULL
```
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