[jira] [Created] (SPARK-32127) Check rules for MERGE INTO should use MergeAction.condition other than MeregAction.children

["Xianyin Xin (Jira)" <ji...@apache.org>]

Xianyin Xin created SPARK-32127:
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             Summary: Check rules for MERGE INTO should use MergeAction.condition other than MeregAction.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


[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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