SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function toDecimal64OrZero (children 1)
     ExpressionList (children 2)
      Literal \'999999999999999999\'
      Literal UInt64_0
    Function toDecimal64OrZero (children 1)
     ExpressionList (children 2)
      Literal \'1000000000000000000\'
      Literal UInt64_0
