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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