SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function equals (alias x) (children 1)
     ExpressionList (children 2)
      Literal \'aaaa\'
      Function trimBoth (children 1)
       ExpressionList (children 2)
        Literal \'b aaaabb \'
        Literal \'b \'