MDEV-14401: Stored procedure that declares a handler that catches ER_LOCK_DEADLOCK error causes thd->is_error() assertion

This was missing bug fix from MySQL wsrep i.e. Galera.
Problem was that if stored procedure declares a handler that
catches deadlock error, then the error may have been
cleared in method sp_rcontext::handle_sql_condition().
Use wsrep_conflict_state correctly to determine is the
error already sent to client.

Add test case for both this bug and MDEV-12837: WSREP: BF
lock wait long. Test requires both fixes to pass.

mysql-test/suite/galera/r/galera_bf_lock_wait.result

@@ -0,0 +1,18 @@
+CREATE TABLE t1 ENGINE=InnoDB select 1 as a, 1 as b union select 2, 2;
+ALTER TABLE t1 add primary key(a);
+CREATE PROCEDURE p1()
+BEGIN
+DECLARE CONTINUE HANDLER FOR SQLEXCEPTION rollback;
+WHILE 1 DO
+start transaction;
+update t1 set b=connection_id() where a=1;
+commit;
+END WHILE;
+END|
+call p1;
+call p1;
+call p1;
+call p1;
+checking error log for 'BF lock wait long' message for 10 times every 10 seconds ...
+drop table t1;
+drop procedure p1;

mysql-test/suite/galera/t/galera_bf_lock_wait.test

@@ -0,0 +1,52 @@
+--source include/galera_cluster.inc
+--source include/big_test.inc
+ 
+CREATE TABLE t1 ENGINE=InnoDB select 1 as a, 1 as b union select 2, 2;
+ALTER TABLE t1 add primary key(a);
+ 
+DELIMITER |;
+ 
+CREATE PROCEDURE p1()
+BEGIN
+        DECLARE CONTINUE HANDLER FOR SQLEXCEPTION rollback;
+        WHILE 1 DO
+                start transaction;
+                update t1 set b=connection_id() where a=1;
+                commit;
+        END WHILE;
+END|
+ 
+ 
+DELIMITER ;|
+ 
+--connect node_1_p1, 127.0.0.1, root, , test, $NODE_MYPORT_1
+send call p1;
+--connect node_1_p2, 127.0.0.1, root, , test, $NODE_MYPORT_1
+send call p1;
+--connect node_2_p1, 127.0.0.1, root, , test, $NODE_MYPORT_2
+send call p1;
+--connect node_2_p2, 127.0.0.1, root, , test, $NODE_MYPORT_2
+send call p1;
+ 
+connection default;
+let $counter=10;
+let $sleep_period=10;
+ 
+echo checking error log for 'BF lock wait long' message for $counter times every $sleep_period seconds ...;
+while($counter > 0)
+{
+--disable_query_log
+--disable_result_log
+  eval do sleep($sleep_period);
+--enable_query_log
+--enable_result_log
+
+# use error 0,1 instead if want test to continue
+  --error 1
+  exec grep 'BF lock wait long' $MYSQLTEST_VARDIR/log/mysqld.*.err;
+  dec $counter;
+}
+ 
+drop table t1;
+drop procedure p1;
+

sql/sql_parse.cc

@@ -5041,14 +5041,19 @@ end_with_restore_list:
       thd->print_aborted_warning(3, "RELEASE");
     }
 #ifdef WITH_WSREP
-    if (WSREP(thd) && (thd->wsrep_conflict_state != NO_CONFLICT &&
+    if (WSREP(thd)) {
-                       thd->wsrep_conflict_state != REPLAYING))
+
+      if (thd->wsrep_conflict_state == NO_CONFLICT ||
+          thd->wsrep_conflict_state == REPLAYING)
       {
-      DBUG_ASSERT(thd->is_error()); // the error is already issued
+        my_ok(thd);
       }
-    else
+    } else {
 #endif /* WITH_WSREP */
 	my_ok(thd);
+#ifdef WITH_WSREP
+    }
+#endif /* WITH_WSREP */
     break;
   }
   case SQLCOM_ROLLBACK:
@@ -5085,13 +5090,16 @@ end_with_restore_list:
     if (tx_release)
       thd->set_killed(KILL_CONNECTION);
 #ifdef WITH_WSREP
-    if (WSREP(thd) && thd->wsrep_conflict_state != NO_CONFLICT)
+    if (WSREP(thd)) {
-    {
+      if (thd->wsrep_conflict_state == NO_CONFLICT) {
-      DBUG_ASSERT(thd->is_error()); // the error is already issued
+        my_ok(thd);
       }
-    else
+    } else {
 #endif /* WITH_WSREP */
 	my_ok(thd);
+#ifdef WITH_WSREP
+    }
+#endif /* WITH_WSREP */
    break;
   }
   case SQLCOM_RELEASE_SAVEPOINT:
@@ -5720,8 +5728,9 @@ finish:
     if (thd->is_error() || (thd->variables.option_bits & OPTION_MASTER_SQL_ERROR))
       trans_rollback_stmt(thd);
 #ifdef WITH_WSREP
-    else if (thd->spcont &&
+    if (thd->spcont &&
              (thd->wsrep_conflict_state == MUST_ABORT ||
+              thd->wsrep_conflict_state == ABORTED    ||
               thd->wsrep_conflict_state == CERT_FAILURE))
     {
       /*