SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function equals (children 1)
     ExpressionList (children 2)
      Function appendTrailingCharIfAbsent (children 1)
       ExpressionList (children 2)
        Literal \'a\'
        Literal \'b\'
      Literal \'ab\'
