[GitHub] [spark] viirya commented on a change in pull request #27444: [SPARK-30614][SQL] The native ALTER COLUMN syntax should change one property at a time

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viirya 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_r375064422
 
 

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 File path: sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4
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 @@ -158,12 +158,9 @@ statement
         SET TBLPROPERTIES tablePropertyList                            #setTableProperties
     | ALTER (TABLE | VIEW) multipartIdentifier
         UNSET TBLPROPERTIES (IF EXISTS)? tablePropertyList             #unsetTableProperties
-    | ALTER TABLE table=multipartIdentifier
+    |ALTER TABLE table=multipartIdentifier
         (ALTER | CHANGE) COLUMN? column=multipartIdentifier
-        (TYPE dataType)? commentSpec? colPosition?                     #alterTableColumn
-    | ALTER TABLE table=multipartIdentifier
 
 Review comment:
   We could clarify this at the PR description.

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