gengliangwang commented on a change in pull request #35690:
URL: https://github.com/apache/spark/pull/35690#discussion_r818344523
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File path:
sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4
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@@ -1078,6 +1090,8 @@ alterColumnAction
| commentSpec
| colPosition
| setOrDrop=(SET | DROP) NOT NULL
+ | SET defaultExpression
+ | dropDefault=DROP DEFAULT
Review comment:
For supporting the ANSI SQL syntax
```
ALTER TABLE table_name ALTER COLUMN column_name SET DEFAULT expr
ALTER TABLE table_name ALTER COLUMN column_name DROP DEFAULT
```
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