16.20 - Overriding the Default Mapping of Parameters - 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)

For UDFs that allow NULL as input arguments (where the CREATE FUNCTION or REPLACE FUNCTION statement specifies the CALLED ON NULL INPUT clause), simple mapping to Java primitives is not appropriate because they cannot represent NULLs.

To override the default mapping, the EXTERNAL NAME clause in the CREATE FUNCTION or REPLACE FUNCTION statement must explicitly specify the mapping in the parameter list of the Java method. For an example that shows how to override the default mapping, see Example: Overriding Default Parameter Mapping to Handle NULLs.