Constant Mode Table Function Phases | External Routine Programming | Vantage - 17.10 - Phases of a Constant Mode Table Function - Advanced SQL Engine - Teradata Database

Teradata Vantageā„¢ - SQL External Routine Programming

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1147-171K
Language
English (United States)

Vantage invokes a constant mode table function repeatedly, allowing the function to pass through different phases where it can perform initialization, connect to external objects, build output rows, close open connections, and clean up. The function uses the FNC_GetPhase library function to determine the phase in which it was called and what action to take.

Here are the phases that the function passes through:


Phases of a constant mode table function

For more information on implementing each phase of a constant mode table function, see Implementation Guidelines.