query_classifier.cc: added function for printing combined query type from a bit field.
query_classifier.h: identify query types SHOW DATABASE, and SHOW TABLES to make log entries more understandable.
mysql_common.c: moved some trace log commands to debug log.
readwritesplit.c: moved some trace logs to debug log, added trace log commands to gather routing, query type and session information to one log entry.
skygw_debug.h: added string macros for several query and hint types.
Execution of session commands failed because session commands and normal sql statements were executed in a wrong order if backend was executing previous session command while new sql stmt was routed to that backend. There was a window where ordering went wrong.
It is possible that one normal sql stmt arrives while previous sescmds are still being executed.
Introduced a new member in backend_ref_t structure, bref_pending_cmd where new sql stmt pointer is stored in that case. When sescmds are executed completely, that command is automatically executed next.
dcb.c:dcb_process_zombies:added new parameter which tells what DCB the thread will use after calling dcb_process_zombies. Thus, processing that DCB is skipped.
readwritesplit.c:routeQuery:removed double free call for query buffer.
server.h:added macro SERVER_IS_ROOT_MASTER for finding valid candidate for root master
readwritesplit.c: wrote open three if conditions in get_root_master_bref for clarity
All counters are now updated in routeQuery
Fix to bug #545, http://bugs.skysql.com/show_bug.cgi?id=545
All sql variable and session modification statements, such as autocommit-, and set <db> commands are routed to all nodes.
Long ~0.5MB queries blocked MaxScale.
mysql_client.c:gw_read_client_event: Fixed packet reading logic. Reading didn't work when packet exceeded read buffer size.
mysql_common.c:gw_MySQL_get_next_packet: number of bytes to be copied to continuous buffer was calculated wrong, thus resulting in broken packet.
readwritesplit.c:disabled creation of canonical query in debug build because it slows down the processing too much with long queries
