SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function equals (children 1)
     ExpressionList (children 2)
      Function if (children 1)
       ExpressionList (children 3)
        Literal UInt64_1
        Function toFixedString (children 1)
         ExpressionList (children 2)
          Literal \'abc\' (alias s)
          Literal UInt64_3
        Function toFixedString (children 1)
         ExpressionList (children 2)
          Literal \'def\'
          Literal UInt64_3
      Identifier s
