gatorsmile commented on issue #24859: [SPARK-28033][SQL] String concatenation should low priority than other operators URL: https://github.com/apache/spark/pull/24859#issuecomment-504706695 I think we are following Oracle when adding the concatenation. https://docs.oracle.com/cd/E11882_01/server.112/e41084/operators001.htm#SQLRF51153 Could you check whether it is true in Oracle?
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