Burak Yavuz created SPARK-30924:
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             Summary: Add additional validation into Merge Into
                 Key: SPARK-30924
                 URL: https://issues.apache.org/jira/browse/SPARK-30924
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 3.0.0
            Reporter: Burak Yavuz


Merge Into is currently missing additional validation around:

 1. The lack of any WHEN statements

 2. Single use of UPDATE/DELETE

 3. The first WHEN MATCHED statement needs to have a condition if there are two 
WHEN MATCHED statements.



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