cloud-fan commented on issue #27677: [SPARK-30924][SQL][3.0] Add additional checks to Merge Into URL: https://github.com/apache/spark/pull/27677#issuecomment-590188948 > It just makes the update condition a bit more complicated with a when() function. OK this makes sense. Since we only allow 2 WHEN matched statements, users should try to compact updates into a single statement as possible as they can.
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