Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/10577#discussion_r49105169
--- 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 --
Is the simple string really a helpful part of this error message?
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