Bug #29536: timestamp inconsistent in replication around 1970

MySQL replicates the time zone only when operations that involve
it are performed. This is controlled by a flag. But this flag
is set only on successful operation.
The flag must be set also when there is an error that involves
a timezone (so the master would replicate the error to the slaves). 

Fixed by moving the setting of the flag before the operation
(so it apples to errors as well).

mysql-test/r/rpl_timezone.result

@@ -130,3 +130,21 @@ t
 2005-01-01 08:00:00
 drop table t1, t2;
 set global time_zone= @my_time_zone;
+End of 4.1 tests
+CREATE TABLE t1 (a INT, b TIMESTAMP);
+INSERT INTO t1 VALUES (1, NOW());
+SET @@session.time_zone='Japan';
+UPDATE t1 SET b= '1970-01-01 08:59:59' WHERE a= 1;
+Warnings:
+Warning	1264	Out of range value adjusted for column 'b' at row 1
+SELECT * FROM t1 ORDER BY a;
+a	b
+1	0000-00-00 00:00:00
+SET @@session.time_zone='Japan';
+SELECT * FROM t1 ORDER BY a;
+a	b
+1	0000-00-00 00:00:00
+SET @@session.time_zone = default;
+DROP TABLE t1;
+SET @@session.time_zone = default;
+End of 5.0 tests

mysql-test/t/rpl_timezone.test

@@ -126,8 +126,33 @@ connection master;
 drop table t1, t2;
 sync_slave_with_master;
 
-# End of 4.1 tests
-
 # Restore original timezone
 connection master;
 set global time_zone= @my_time_zone;
+
+--echo End of 4.1 tests
+
+#
+# Bug #29536: timestamp inconsistent in replication around 1970
+#
+connection master;
+
+CREATE TABLE t1 (a INT, b TIMESTAMP);
+INSERT INTO t1 VALUES (1, NOW());
+
+SET @@session.time_zone='Japan';
+UPDATE t1 SET b= '1970-01-01 08:59:59' WHERE a= 1;
+SELECT * FROM t1 ORDER BY a;
+
+sync_slave_with_master;
+SET @@session.time_zone='Japan';
+# must procdure the same result as the SELECT on the master
+SELECT * FROM t1 ORDER BY a;
+
+SET @@session.time_zone = default;
+connection master;
+DROP TABLE t1;
+SET @@session.time_zone = default;
+
+
+--echo End of 5.0 tests

sql/field.cc

@@ -4462,6 +4462,7 @@ longlong Field_timestamp::val_int(void)
   MYSQL_TIME time_tmp;
   THD  *thd= table ? table->in_use : current_thd;
 
+  thd->time_zone_used= 1;
 #ifdef WORDS_BIGENDIAN
   if (table && table->s->db_low_byte_first)
     temp=uint4korr(ptr);
@@ -4473,7 +4474,6 @@ longlong Field_timestamp::val_int(void)
     return(0);					/* purecov: inspected */
   
   thd->variables.time_zone->gmt_sec_to_TIME(&time_tmp, (my_time_t)temp);
-  thd->time_zone_used= 1;
   
   return time_tmp.year * LL(10000000000) + time_tmp.month * LL(100000000) +
          time_tmp.day * 1000000L + time_tmp.hour * 10000L +
@@ -4492,6 +4492,7 @@ String *Field_timestamp::val_str(String *val_buffer, String *val_ptr)
   to= (char*) val_buffer->ptr();
   val_buffer->length(field_length);
 
+  thd->time_zone_used= 1;
 #ifdef WORDS_BIGENDIAN
   if (table && table->s->db_low_byte_first)
     temp=uint4korr(ptr);
@@ -4507,7 +4508,6 @@ String *Field_timestamp::val_str(String *val_buffer, String *val_ptr)
   val_buffer->set_charset(&my_charset_bin);	// Safety
   
   thd->variables.time_zone->gmt_sec_to_TIME(&time_tmp,(my_time_t)temp);
-  thd->time_zone_used= 1;
 
   temp= time_tmp.year % 100;
   if (temp < YY_PART_YEAR - 1)
@@ -4557,6 +4557,7 @@ bool Field_timestamp::get_date(MYSQL_TIME *ltime, uint fuzzydate)
 {
   long temp;
   THD *thd= table ? table->in_use : current_thd;
+  thd->time_zone_used= 1;
 #ifdef WORDS_BIGENDIAN
   if (table && table->s->db_low_byte_first)
     temp=uint4korr(ptr);
@@ -4572,7 +4573,6 @@ bool Field_timestamp::get_date(MYSQL_TIME *ltime, uint fuzzydate)
   else
   {
     thd->variables.time_zone->gmt_sec_to_TIME(ltime, (my_time_t)temp);
-    thd->time_zone_used= 1;
   }
   return 0;
 }

sql/time.cc

@@ -228,11 +228,11 @@ my_time_t TIME_to_timestamp(THD *thd, const MYSQL_TIME *t, my_bool *in_dst_time_
   my_time_t timestamp;
 
   *in_dst_time_gap= 0;
+  thd->time_zone_used= 1;
 
   timestamp= thd->variables.time_zone->TIME_to_gmt_sec(t, in_dst_time_gap);
   if (timestamp)
   {
-    thd->time_zone_used= 1;
     return timestamp;
   }