16.20 - Rules for Order Mapping UDFs - Teradata Database - Teradata Vantage NewSQL Engine

Teradata Vantage™ SQL Data Definition Language Detailed Topics

Teradata Database
Teradata Vantage NewSQL Engine
Release Number
March 2019
Content Type
Programming Reference
Publication ID
English (United States)
If you specify a UDF as the MAP routine for an ordering, it must obey the following rules:
  • It must have one and only one parameter.
  • The data type of the single parameter you specify must be the same as that of the UDT specified as UDT_name.
  • The result data type must be a predefined data type.

    Its predefined data type is valid except the following:

    • BLOB
    • CLOB
  • It must be declared to be DETERMINISTIC.
  • The name you specify for it in the ordering definition must be the name of a UDF contained within the SYSUDTLIB database.

See CREATE FUNCTION and REPLACE FUNCTION (External Form) for details about UDF parameters, result data types, and the DETERMINISTIC option.