C Constant/Variable Mode Table Function W/ Dynamic Result Row Spec | Vantage - C Constant/Variable Mode Table Function With Dynamic Result Row Specification - Advanced SQL Engine - Teradata Database

SQL External Routine Programming

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Published
July 2021
Language
English (United States)
Last Update
2021-07-27
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B035-1147
lifecycle
previous
Product Category
Teradata Vantageā„¢

This example is similar to the preceding example, C Constant/Variable Mode Table Function, and shows the C code for a table function that supports both TBL_MODE_CONST and the TBL_MODE_VARY modes. The TBL_MODE_CONST is very simple in that any one AMP will extract the data out of the text string that is passed in.

The table function can return a maximum of four columns, as specified by the RETURNS TABLE VARYING COLUMNS clause in the REPLACE FUNCTION statement.

Each output parameter in the table function parameter list is declared as a void pointer because the actual data types of the result row arguments are unknown until function invocation.

During execution, the table function calls the FNC_TblGetColDef library function to get the actual number and data types of the result row arguments.