SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function toDecimal64 (children 1)
     ExpressionList (children 2)
      Function toDecimal64 (children 1)
       ExpressionList (children 2)
        Literal \'1234567890\'
        Literal UInt64_8
      Literal UInt64_10