Minor code optimizations

About:
handler_again___verify_backend_multi_statement()
handler_again___verify_init_connect()

lib/MySQL_Session.cpp

@@ -5005,6 +5005,7 @@ int MySQL_Session::handler() {
 				MySQL_Data_Stream *myds=mybe->server_myds;
 				MySQL_Connection *myconn=myds->myconn;
 				mybe->server_myds->max_connect_time=0;
+				MySQL_Connection *client_myconn = client_myds->myconn;
 				// we insert it in mypolls only if not already there
 				if (myds->mypolls==NULL) {
 					thread->mypolls.add(POLLIN|POLLOUT, mybe->server_myds->fd, mybe->server_myds, thread->curtime);
@@ -5018,8 +5019,10 @@ int MySQL_Session::handler() {
 					if (mirror==false) { // do not care about autocommit and charset if mirror
 							proxy_debug(PROXY_DEBUG_MYSQL_CONNECTION, 5, "Session %p , default_HG=%d server_myds DSS=%d , locked_on_HG=%d\n", this, default_hostgroup, mybe->server_myds->DSS, locked_on_hostgroup);
 						if (mybe->server_myds->DSS == STATE_READY || mybe->server_myds->DSS == STATE_MARIADB_GENERIC) {
-							if (handler_again___verify_init_connect()) {
-								goto handler_again;
+							if (unlikely(myconn->options.init_connect_sent==false)) { // micro-optimization. Perform this check outside handler_again___verify_init_connect()
+								if (handler_again___verify_init_connect()) {
+									goto handler_again;
+								}
 							}
 							if (use_ldap_auth) {
 								if (handler_again___verify_ldap_user_variable()) {
@@ -5031,8 +5034,10 @@ int MySQL_Session::handler() {
 							}
 							if (locked_on_hostgroup == -1 || locked_on_hostgroup_and_all_variables_set == false ) {
 
-								if (handler_again___verify_backend_multi_statement()) {
-									goto handler_again;
+								if (unlikely(client_myconn->options.client_flag & CLIENT_MULTI_STATEMENTS) != (myconn->options.client_flag & CLIENT_MULTI_STATEMENTS)) { // micro-optimization. Perform this check outside handler_again___verify_backend_multi_statement
+									if (handler_again___verify_backend_multi_statement()) {
+										goto handler_again;
+									}
 								}
 
 								if (handler_again___verify_backend_session_track_gtids()) {