[rlm_sql] Callback sql_fields

Hi, after a diff of rlm_sql_ocioracle.c or rlm_sql_mysql.c between version 3.0.8 and last 3.0.17 I see that on rlm_sql_module_t structure is present sql_fields callback, but I don't see on rlm_sql.c code where it is used. 1) It is related a new callback for next releases ? 2) What is target of sql_fields callback ? The idea is store column data pointer directly on rlm_sql strucuture to avoid duplicate code on handle array of strings ? 3) sql_store_result instead wil be removed ? Thanks in advance for any support. G.