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The mi_funcarg_get_routine_name() returns the routine identifier for the expensive UDR of a cost or selectivity function.
The mi_funcarg_get_routine_name() function returns the routine name from the MI_FUNCARG structure that funcarg_ptr references. The MI_FUNCARG structure describes an argument of an expensive UDR to its cost or selectivity function. Use the mi_funcarg_get_routine_name() function in a cost or selectivity function to obtain the routine name for the expensive UDR.
mi_string * | is a pointer to the routine name of the expensive UDR. |
NULL | indicates that the function was not successful. |
See the descriptions of the following functions: mi_funcarg_get_argtype(), mi_funcarg_get_colno(), mi_funcarg_get_constant(), mi_funcarg_get_datalen(), mi_funcarg_get_datatype(), mi_funcarg_get_distrib(), mi_funcarg_get_routine_id(), mi_funcarg_get_tabid(), and mi_funcarg_isnull().
For more information, see Creating Selectivity and Cost Functions.