MDEV-18837 Fixed stored procedure wsrep error handling and MW-388

Fixed sync points in MW-388 and fixed SP wsrep error handling to
avoid propagating wsrep errors via client-server protocol response.

mysql-test/suite/galera/disabled.def

@@ -18,7 +18,6 @@ MW-328C : MDEV-17847 Galera test failure on MW-328[A|B|C]
 MW-329 : wsrep_local_replays not stable
 MW-336 : MDEV-13549 incorrect wait_condition for wsrep_slave_threads changes
 MW-360 : needs rewrite to be MariaDB gtid compatible
-MW-388: MDEV-18837 Test failure: mysqltest: Result length mismatch
 MW-416 : MDEV-13549 Galera test failures
 MW-44 : MDEV-15809 Test failure on galera.MW-44
 galera_account_management : MariaDB 10.0 does not support ALTER USER

mysql-test/suite/galera/r/MW-388.result

@@ -23,15 +23,15 @@ SET SESSION wsrep_sync_wait = 0;
 SET SESSION DEBUG_SYNC = 'wsrep_after_certification SIGNAL wsrep_after_certification_reached WAIT_FOR wsrep_after_certification_continue';
 CALL insert_proc ();;
 connection node_1a;
-SET SESSION DEBUG_SYNC = "now WAIT_FOR wsrep_after_replication_reached";
+SET SESSION DEBUG_SYNC = "now WAIT_FOR wsrep_after_certification_reached";
 SET GLOBAL DEBUG_DBUG = "";
-SET DEBUG_SYNC = "now SIGNAL wsrep_after_replication_continue";
+SET DEBUG_SYNC = "now SIGNAL wsrep_after_certification_continue";
 SET DEBUG_SYNC = "now SIGNAL signal.wsrep_apply_cb";
 connection node_2;
 connection node_1;
-SELECT @errno = 1213;
-@errno = 1213
-1
+SELECT @errno `expect 1213`;
+expect 1213
+1213
 SELECT * FROM t1;
 f1	f2
 1	node 2

mysql-test/suite/galera/t/MW-388.test

@@ -47,16 +47,17 @@ SET SESSION DEBUG_SYNC = "now WAIT_FOR wsrep_after_certification_reached";
 
 
 SET GLOBAL DEBUG_DBUG = "";
-SET DEBUG_SYNC = "now SIGNAL wsrep_after_replication_continue";
+SET DEBUG_SYNC = "now SIGNAL wsrep_after_certification_continue";
 SET DEBUG_SYNC = "now SIGNAL signal.wsrep_apply_cb";
 
 --connection node_2
 --reap
 
 --connection node_1
-# We expect no errors here, because the handler in insert_proc() caught the deadlock error
+# We expect no errors here, because the handler in insert_proc()
+# caught the deadlock error
 --reap
-SELECT @errno = 1213;
+SELECT @errno `expect 1213`;
 SELECT * FROM t1;
 
 --connection node_2

sql/sp_head.cc

@@ -3609,7 +3609,7 @@ sp_instr_stmt::exec_core(THD *thd, uint *nextp)
   {
     /*
       SP was killed, and it is not due to a wsrep conflict.
-      We skip after_command hook at this point because
+      We skip after_statement hook at this point because
       otherwise it clears the error, and cleans up the
       whole transaction. For now we just return and finish
       our handling once we are back to mysql_parse.
@@ -3619,6 +3619,18 @@ sp_instr_stmt::exec_core(THD *thd, uint *nextp)
   else
   {
     (void) wsrep_after_statement(thd);
+    /*
+      Final wsrep error status for statement is known only after
+      wsrep_after_statement() call. If the error is set, override
+      error in thd diagnostics area and reset wsrep client_state error
+      so that the error does not get propagated via client-server protocol.
+    */
+    if (wsrep_current_error(thd))
+    {
+      wsrep_override_error(thd, wsrep_current_error(thd),
+                           wsrep_current_error_status(thd));
+      thd->wsrep_cs().reset_error();
+    }
   }
 #endif /* WITH_WSREP */
   MYSQL_QUERY_EXEC_DONE(res);