Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/10577#discussion_r49159348 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CheckAnalysis.scala --- @@ -189,6 +189,16 @@ trait CheckAnalysis { s"but the left table has ${left.output.length} columns and the right has " + s"${right.output.length}") + case s: Union if s.children.exists(_.output.length != s.children.head.output.length) => + s.children.filter(_.output.length != s.children.head.output.length).exists { child => + failAnalysis( + s""" + |Unions can only be performed on tables with the same number of columns, + | but the table '${child.simpleString}' has '${child.output.length}' columns --- End diff -- Ok, let me remove it.
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