The EXTFNAPIV4_DESCRIBE_PARM_TABLE_HAS_REWIND attribute indicates if the parameter supports rewind. Used in a describe_parameter_get scenario.
a_sql_byte
Indicates whether a producer can support rewind. Valid only for table arguments.
You must also provide an implementation of the rewind table callback (_rewind_extfn() ) if you plan on setting DESCRIBE_PARM_TABLE_HAS_REWIND to true. The server will fail to execute the UDF if the callback method is not provided.
The UDF asks if a table input argument supports rewind. As a prerequisite, the UDF must request rewind using DESCRIBE_PARM_TABLE_REQUEST_REWIND before you can use this property.
On success, returns sizeof(a_sql_byte).