CS_EXTRA_INF determines whether or not Client-Library returns the extra information that ct_diag requires to fill in a SQLCA, SQLCODE, or SQLSTATE structure.
This extra information includes the number of rows affected by the most recent command. Applications also retrieve this information by calling ct_res_info(CS_ROW_COUNT).
If an application is not retrieving messages into a SQLCA, SQLCODE, or SQLSTATE, the extra information is returned as ordinary Client-Library messages.
