SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 5)
   ExpressionList (children 2)
    Identifier s
    Identifier s.size
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier test_old
   Function greater (children 1)
    ExpressionList (children 2)
     Identifier y
     Literal UInt64_5
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier y
   Literal UInt64_2
