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https://issues.apache.org/jira/browse/SPARK-32127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17147766#comment-17147766
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Apache Spark commented on SPARK-32127:
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User 'xianyinxin' has created a pull request for this issue:
https://github.com/apache/spark/pull/28875
> Check rules for MERGE INTO should use MergeAction.condition other than
> MergeAction.children
> -------------------------------------------------------------------------------------------
>
> Key: SPARK-32127
> URL: https://issues.apache.org/jira/browse/SPARK-32127
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Xianyin Xin
> Assignee: Xianyin Xin
> Priority: Major
> Fix For: 3.0.1, 3.1.0
>
>
> [SPARK-30924|https://issues.apache.org/jira/browse/SPARK-30924] adds some
> check rules for MERGE INTO one of which ensures the first MATCHED clause must
> have a condition. However, it uses {{MergeAction.children}} in the checking
> which is not accurate for the case, and it lets the below case pass the check:
> {code:scala}
> MERGE INTO testcat1.ns1.ns2.tbl AS target
> xxx
> WHEN MATCHED THEN UPDATE SET target.col2 = source.col2
> WHEN MATCHED THEN DELETE
> xxx
> {code}
> We should use {{MergeAction.condition}} instead.
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