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The mi_funcarg_get_datalen() returns the data length of an argument for the expensive UDR of a cost or selectivity function.
The mi_funcarg_get_datalen() function returns the data length of the argument 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_datalen() function in a cost or selectivity function to obtain the data length of an argument passed into the expensive UDR.
>= 0 | is the data length for the expensive-UDR argument. |
MI_ERROR | 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_datatype(), mi_funcarg_get_distrib(), mi_funcarg_get_routine_id(), mi_funcarg_get_routine_name(), mi_funcarg_get_tabid(), and mi_funcarg_isnull().
For more information, see Creating Selectivity and Cost Functions.