16.20 - Usage Notes - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL External Routine Programming

Product
Advanced SQL Engine
Teradata Database
Release Number
16.20
Release Date
April 2020
Content Type
Programming Reference
Publication ID
B035-1147-162K
Language
English (United States)

When a table function with dynamic result row specification is defined by the CREATE FUNCTION statement, the RETURNS TABLE VARYING COLUMNS specifies the maximum number of result columns that the table function supports.

The actual number and definition (data type and attributes) of the output columns that the table function must return is not known until runtime, when the table function is invoked in a SELECT statement.

A table function uses FNC_TblGetColDef at runtime to get the number and definition of the output columns that the table function must return.

This function can be called during any table function processing phase.