mgaido91 commented on issue #24859: [SPARK-28033][SQL] String concatenation should low priority than other operators URL: https://github.com/apache/spark/pull/24859#issuecomment-502587832 I do think so, it is a behavior change. Despite the previous behavior was wrong, this may change users' results so we should notify them about the change, in order to let them check their queries using this operator. It would be pretty bad for a user to realize that the query has a behavior change and there is no documentation at all about what changed...
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