Github user hvanhovell commented on a diff in the pull request: https://github.com/apache/spark/pull/14355#discussion_r72391248 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CheckAnalysis.scala --- @@ -266,6 +266,13 @@ trait CheckAnalysis extends PredicateHelper { s"but one table has '${firstError.output.length}' columns and another table has " + s"'${s.children.head.output.length}' columns") + case Union(c) if c.exists(_.output.map(_.dataType) != c.head.output.map(_.dataType)) => --- End diff -- Should we do the same for the other SET operators?
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