The EXTFNAPIV4_DESCRIBE_PARM_TYPE attribute returns the data type in a describe_parameter_get scenario.
a_sql_data_type
The data type of a parameter to a UDF.
Gets the data type of the parameter as defined in the CREATE PROCEDURE statement.
On success, returns sizeof(a_sql_data_type).
On failure, returns one of the generic describe_parameter errors or:
Valid in: