xianyinxin commented on a change in pull request #28875:
URL: https://github.com/apache/spark/pull/28875#discussion_r443415961
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File path:
sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4
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@@ -437,8 +437,7 @@ dmlStatementNoWith
USING (source=multipartIdentifier |
'(' sourceQuery=query')') sourceAlias=tableAlias
ON mergeCondition=booleanExpression
- matchedClause*
- notMatchedClause*
#mergeIntoTable
+ matchedOrNotMatchedClause*
#mergeIntoTable
Review comment:
I checked the SQL-Server and Oracle, both keep the WHEN MATCHED clauses
before the WHEN NOT MATCHED clauses. Shall we obey the same constraint?
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