MDEV-26031 unnessary xid logging in one phase commit case

The bug was originally observed as hanging binlog background thread at
shutdown similar to one of MDEV-21120.
It occurred through unnessary xid logging in 1pc execution.

Two parts of the issue are fixed.  Per engine loop by involved engine
with attempt to mark a group requiring xid unlogging gets corrected in
two ways. Do not execute it when the termination event is irrelevant
for recovery, does not have xid in particular.  Do not break the loop
anymore unconditionally at the end of the 1st iteration.

mysql-test/suite/binlog/r/binlog_1pc.result

+RESET MASTER;
+CREATE TABLE t (f INT) ENGINE=INNODB;
+CREATE TABLE ta (f INT) ENGINE=Aria;
+BEGIN;
+INSERT INTO t  SET f = 1;
+INSERT INTO ta SET f = 1;
+COMMIT;
+include/show_binlog_events.inc
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+master-bin.000001	#	Gtid	#	#	BEGIN GTID #-#-#
+master-bin.000001	#	Query	#	#	use `test`; INSERT INTO ta SET f = 1
+master-bin.000001	#	Query	#	#	COMMIT
+master-bin.000001	#	Gtid	#	#	BEGIN GTID #-#-#
+master-bin.000001	#	Query	#	#	use `test`; INSERT INTO t  SET f = 1
+master-bin.000001	#	Query	#	#	COMMIT
+# Prove that binlog is resettable. Under the bug condition it was not.
+RESET MASTER;
+SET @@binlog_format = ROW;
+CREATE TABLE ta2 ENGINE = Aria SELECT * from t;
+include/show_binlog_events.inc
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+master-bin.000001	#	Gtid	#	#	BEGIN GTID #-#-#
+master-bin.000001	#	Query	#	#	use `test`; CREATE TABLE `ta2` (
+  `f` int(11) DEFAULT NULL
+) ENGINE=Aria PAGE_CHECKSUM=1
+master-bin.000001	#	Annotate_rows	#	#	CREATE TABLE ta2 ENGINE = Aria SELECT * from t
+master-bin.000001	#	Table_map	#	#	table_id: # (test.ta2)
+master-bin.000001	#	Write_rows_v1	#	#	table_id: # flags: STMT_END_F
+master-bin.000001	#	Query	#	#	COMMIT
+# Prove that binlog is resettable. Under the bug condition it was not.
+RESET MASTER;
+# Cleanup
+DROP TABLE ta2, ta, t;
+# End of the tests

mysql-test/suite/binlog/t/binlog_1pc.test

+# The test file contains tests specific to one phase commit
+# execution and binlogging.
+#
+# MDEV-26031 unnessary xid logging in one phase commit case
+#
+--source include/have_innodb.inc
+--source include/have_aria.inc
+--source include/have_binlog_format_mixed.inc
+
+RESET MASTER;
+
+CREATE TABLE t (f INT) ENGINE=INNODB;
+CREATE TABLE ta (f INT) ENGINE=Aria;
+
+--let $binlog_start = query_get_value(SHOW MASTER STATUS, Position, 1)
+BEGIN;
+  INSERT INTO t  SET f = 1;
+  INSERT INTO ta SET f = 1;
+COMMIT;
+--let $binlog_file =  query_get_value(SHOW MASTER STATUS, File, 1)
+--source include/show_binlog_events.inc
+
+--echo # Prove that binlog is resettable. Under the bug condition it was not.
+RESET MASTER;
+
+--let $binlog_start = query_get_value(SHOW MASTER STATUS, Position, 1)
+--let $binlog_file =  query_get_value(SHOW MASTER STATUS, File, 1)
+SET @@binlog_format = ROW;
+CREATE TABLE ta2 ENGINE = Aria SELECT * from t;
+--source include/show_binlog_events.inc
+
+--echo # Prove that binlog is resettable. Under the bug condition it was not.
+RESET MASTER;
+
+
+--echo # Cleanup
+DROP TABLE ta2, ta, t;
+
+--echo # End of the tests

sql/log.cc

@@ -2186,11 +2186,20 @@ int binlog_commit(THD *thd, bool all, bool ro_1pc)
   */
   if (likely(!error) && ending_trans(thd, all))
   {
-    error= is_preparing_xa(thd) ?
+    bool is_xa_prepare= is_preparing_xa(thd);
+
+    error= is_xa_prepare ?
       binlog_commit_flush_xa_prepare(thd, all, cache_mngr) :
       binlog_commit_flush_trx_cache (thd, all, cache_mngr, ro_1pc);
+      // the user xa is unlogged on common exec path with the "empty" xa case
+      if (cache_mngr->need_unlog && !is_xa_prepare)
+      {
+        error=
+          mysql_bin_log.unlog(BINLOG_COOKIE_MAKE(cache_mngr->binlog_id,
+                                                 cache_mngr->delayed_error), 1);
+        cache_mngr->need_unlog= false;
+      }
   }
-
   /*
     This is part of the stmt rollback.
   */
@@ -7634,16 +7643,16 @@ MYSQL_BIN_LOG::write_transaction_to_binlog(THD *thd,
   entry.need_unlog= is_preparing_xa(thd);
   ha_info= all ? thd->transaction->all.ha_list : thd->transaction->stmt.ha_list;
   entry.ro_1pc= is_ro_1pc;
+  entry.end_event= end_ev;
+  auto has_xid= entry.end_event->get_type_code() == XID_EVENT;
 
-  for (; !entry.need_unlog && ha_info; ha_info= ha_info->next())
+  for (; has_xid && !entry.need_unlog && ha_info; ha_info= ha_info->next())
   {
     if (ha_info->is_started() && ha_info->ht() != binlog_hton &&
         !ha_info->ht()->commit_checkpoint_request)
       entry.need_unlog= true;
-    break;
   }
 
-  entry.end_event= end_ev;
   if (cache_mngr->stmt_cache.has_incident() ||
       cache_mngr->trx_cache.has_incident())
   {