Vantage repeatedly invokes a Java method that implements a constant mode table UDF, allowing the method to pass through different phases of execution where it can perform initialization, access system resources, and build output rows. The method uses com.Teradata.fnc.Tbl.getPhase() to determine the phase in which it was called and what action to take.
Here are the phases that the function passes through:
For details on implementing each phase of a constant mode table function, see Implementation Guidelines.