SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function sumWithOverflow (children 1)
     ExpressionList (children 1)
      Function minus (children 1)
       ExpressionList (children 2)
        Identifier a
        Literal UInt64_65537
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 2)
          ExpressionList (children 1)
           Function CAST (alias a) (children 1)
            ExpressionList (children 2)
             Identifier number
             Literal \'Decimal32(4)\'
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             Function numbers (children 1)
              ExpressionList (children 1)
               Literal UInt64_10