BUG#41719 delayed INSERT into timestamp col needs set time_zone for concurrent binlogging

When do 'insert delayed' operation, the time_zone info doesn't be keeped in the row info.
So when we do insert sometime later, time_zone didn't write into binlog.
This will cause wrong result for timestamp column in slave.

Our solution is that adding time_zone info with the delayed-row and
restoring time_zone from row-info when execute that row in the furture by another thread.
So we can write correct time_zone info into binlog and got correct result in slave.

mysql-test/r/rpl_timezone.result

@@ -153,4 +153,22 @@ a	b
 SET @@session.time_zone = default;
 DROP TABLE t1;
 SET @@session.time_zone = default;
+CREATE TABLE t1 (date timestamp NOT NULL default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP, a int(11) default NULL);
+SET @@session.time_zone='+01:00';
+insert into t1 values('2008-12-23 19:39:39',1);
+SET @@session.time_zone='+02:00';
+insert delayed into t1 values ('2008-12-23 19:39:39',2);
+flush table t1;
+flush logs;
+select * from t1;
+date	a
+2008-12-23 20:39:39	1
+2008-12-23 19:39:39	2
+DROP TABLE t1;
+select * from t1 order by a;
+date	a
+2008-12-23 20:39:39	1
+2008-12-23 19:39:39	2
+DROP TABLE t1;
+SET @@session.time_zone = default;
 End of 5.0 tests

mysql-test/t/rpl_timezone.test

@@ -154,5 +154,30 @@ connection master;
 DROP TABLE t1;
 SET @@session.time_zone = default;
 
+# Bug#41719 delayed INSERT into timestamp col needs set time_zone for concurrent binlogging
+# To test that time_zone is correctly binloging for 'insert delayed' statement
+# Insert 2 values into timestamp col with different time_zone. Check result.
+
+--connection master
+CREATE TABLE t1 (date timestamp NOT NULL default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP, a int(11) default NULL);
+
+SET @@session.time_zone='+01:00';
+insert into t1 values('2008-12-23 19:39:39',1);
+
+--connection master1
+SET @@session.time_zone='+02:00';
+insert delayed into t1 values ('2008-12-23 19:39:39',2);
+# Forces table t1 to be closed and flushes the query cache.
+# This makes sure that 'delayed insert' is executed before next statement.
+flush table t1;
+flush logs;
+select * from t1;
+DROP TABLE t1;
+
+--exec $MYSQL_BINLOG $MYSQLTEST_VARDIR/log/master-bin.000001 | $MYSQL
+--connection master1
+select * from t1 order by a;
+DROP TABLE t1;
+SET @@session.time_zone = default;
 
 --echo End of 5.0 tests

sql/sql_insert.cc

@@ -1605,10 +1605,11 @@ public:
   ulong auto_increment_increment;
   ulong auto_increment_offset;
   timestamp_auto_set_type timestamp_field_type;
+  Time_zone *time_zone;
   uint query_length;
 
   delayed_row(enum_duplicates dup_arg, bool ignore_arg, bool log_query_arg)
-    :record(0), query(0), dup(dup_arg), ignore(ignore_arg), log_query(log_query_arg) {}
+    :record(0), query(0), time_zone(0), dup(dup_arg), ignore(ignore_arg), log_query(log_query_arg) {}
   ~delayed_row()
   {
     x_free(record);
@@ -2062,6 +2063,19 @@ int write_delayed(THD *thd,TABLE *table,enum_duplicates duplic, bool ignore,
   row->last_insert_id=		thd->last_insert_id;
   row->timestamp_field_type=    table->timestamp_field_type;
 
+  /* Add session variable timezone
+     Time_zone object will not be freed even the thread is ended.
+     So we can get time_zone object from thread which handling delayed statement.
+     See the comment of my_tz_find() for detail.
+  */
+  if (thd->time_zone_used)
+  {
+    row->time_zone = thd->variables.time_zone;
+  }
+  else
+  {
+    row->time_zone = NULL;
+  }
   /* The session variable settings can always be copied. */
   row->auto_increment_increment= thd->variables.auto_increment_increment;
   row->auto_increment_offset=    thd->variables.auto_increment_offset;
@@ -2515,8 +2529,19 @@ bool Delayed_insert::handle_inserts(void)
     }
     if (row->query && row->log_query && using_bin_log)
     {
+      bool backup_time_zone_used = thd.time_zone_used;
+      Time_zone *backup_time_zone = thd.variables.time_zone;
+      if (row->time_zone != NULL)
+      {
+        thd.time_zone_used = true;
+        thd.variables.time_zone = row->time_zone;
+      }
+
       Query_log_event qinfo(&thd, row->query, row->query_length, 0, FALSE);
       mysql_bin_log.write(&qinfo);
+
+      thd.time_zone_used = backup_time_zone_used;
+      thd.variables.time_zone = backup_time_zone;
     }
     if (table->s->blob_fields)
       free_delayed_insert_blobs(table);