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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