Manual merge of mysql-5.1-bugteam into mysql-trunk-merge.

Conflicts:

Text conflict in mysql-test/suite/rpl/t/rpl_get_master_version_and_clock.test
Text conflict in sql/item_func.cc

20 files changed, 260 insertions, 168 deletions

diff --git a/mysql-test/extra/rpl_tests/rpl_get_master_version_and_clock.test b/mysql-test/extra/rpl_tests/rpl_get_master_version_and_clock.test
index 89c136d8893..c392686454d 100644
--- a/mysql-test/extra/rpl_tests/rpl_get_master_version_and_clock.test
+++ b/mysql-test/extra/rpl_tests/rpl_get_master_version_and_clock.test
@@ -3,26 +3,53 @@
 # The common part of the "rpl_get_master_version_and_clock" test. 
 # Restart slave under network disconnection between slave and master
 # following the steps:
-#    1 - Got DBUG_SYNC_POINT lock
-#    2 - Set DBUG_SYNC_POINT before call mysql_real_query(...) function in get_master_version_and_clock(...) function and hang here
-#    3 - shutdown master server for simulating network disconnection
-#    4 - Release DBUG_SYNC_POINT lock
-#    5 - Check if the slave I/O thread tries to reconnect to master. 
+#    0 - Set DEBUG_SYNC_ACTION to wait 
+#        before call mysql_real_query(...) function in get_master_version_and_clock(...)
+#        function and hang here
+#    1 - activate a sync-point through the $dbug_sync_point argument of the test
+#    2 - shutdown master server for simulating network disconnection
+#    3 - signal to the IO thread through $debug_sync_action to unhold from the sync-point
+#    4 - check if the slave I/O thread tries to reconnect to master. 
 #
-# Note: Please make sure initialize the $debug_lock when call the test script.
+# Note: make sure to initialize the $debug_sync_action and $dbug_sync_point
+#       before calling the test script.
 #
+# Pattern of usage:
+#
+# The caller test supplies the DBUG_EXECUTE_IF name
+#
+#    let $dbug_sync_point = 'dbug_execute_if_name';
+#
+# as well as the action list for DEBUG_SYNC
+#    
+#    let $debug_sync_action= 'now signal signal_name';
+#
+# The $dbug_sync_point becomes the value of @@global.debug generating
+# a newly started IO-slave thread's session value.
+# Notice incremental operations to add and remove dbug_execute_if_name
+# from the global variable allows propagation more dbug arguments
+# out of mtr.
+# The action list is to fire at proper time according to test logics
+# (see pp 0-4 above).
+#
+
 connection slave;
-if (`SELECT '$debug_lock' = ''`)
+if (`SELECT $debug_sync_action = ''`)
 {
-    --die Cannot continue. Please set value for $debug_lock.
+    --die Cannot continue. Please set value for debug_sync_action.
 }
 
 # Restart slave
 --disable_warnings
 stop slave;
 source include/wait_for_slave_to_stop.inc;
+
+eval SET @@global.debug= "+d,$dbug_sync_point";
+
 start slave;
 source include/wait_for_slave_to_start.inc;
+--echo slave is going to hang in get_master_version_and_clock
+
 connection master;
 # Write file to make mysql-test-run.pl expect the "crash", but don't start
 # it until it's told to
@@ -35,7 +62,9 @@ EOF
 shutdown_server 10;
 
 connection slave;
-eval SELECT RELEASE_LOCK($debug_lock);
+--echo slave is unblocked
+
+eval SET DEBUG_SYNC=$debug_sync_action;
 
 # Show slave last IO errno
 connection slave;
@@ -53,6 +82,12 @@ if (`SELECT '$last_io_errno' = '2013' || # CR_SERVER_LOST
   --echo NETWORK ERROR
 }
 
+# deactivate the sync point of get_master_version_and_clock()
+# now to avoid restarting IO-thread to re-enter it.
+# There will be a new IO thread forked out with its @@session.debug
+# unset.
+eval set @@global.debug = "-d,$dbug_sync_point";
+
 # Write file to make mysql-test-run.pl start up the server again
 --append_file $MYSQLTEST_VARDIR/tmp/mysqld.1.expect
 restart
diff --git a/mysql-test/r/ctype_ldml.result b/mysql-test/r/ctype_ldml.result
index a63dc91f305..57d9cc02bc7 100644
--- a/mysql-test/r/ctype_ldml.result
+++ b/mysql-test/r/ctype_ldml.result
@@ -49,6 +49,15 @@ SELECT * FROM t1 WHERE LOWER(a)=LOWER('N');
 a
 DROP TABLE t1;
 #
+# Bug#51976 LDML collations issue (cyrillic example)
+#
+CREATE TABLE t1 (a VARCHAR(10) CHARACTER SET utf8 COLLATE utf8_test_ci);
+INSERT INTO t1 (a) VALUES ('Hello');
+SELECT a, UPPER(a), LOWER(a) FROM t1;
+a	UPPER(a)	LOWER(a)
+Hello	HELLO	hello
+DROP TABLE t1;
+#
 # Bug#43827 Server closes connections and restarts
 #
 CREATE TABLE t1 (c1 VARCHAR(10) CHARACTER SET utf8 COLLATE utf8_test_ci);
diff --git a/mysql-test/r/mysqlbinlog_row_innodb.result b/mysql-test/r/mysqlbinlog_row_innodb.result
index 86f0b67ebb3..ee448311278 100644
--- a/mysql-test/r/mysqlbinlog_row_innodb.result
+++ b/mysql-test/r/mysqlbinlog_row_innodb.result
@@ -2365,7 +2365,7 @@ BEGIN
 #010909  4:46:40 server id 1  end_log_pos # 	Write_rows: table id # flags: STMT_END_F
 ### INSERT INTO test.t1
 ### SET
-###   @1=b'00000000' /* BIT(8) meta=256 nullable=1 is_null=0 */
+###   @1=b'0' /* BIT(1) meta=1 nullable=1 is_null=0 */
 ###   @2=b'0000000000000000000000000000000000000000000000000000000000000000' /* BIT(64) meta=2048 nullable=1 is_null=0 */
 ###   @3=-128 (128) /* TINYINT meta=0 nullable=1 is_null=0 */
 ###   @4=0 /* TINYINT meta=0 nullable=1 is_null=0 */
@@ -2458,7 +2458,7 @@ BEGIN
 #010909  4:46:40 server id 1  end_log_pos # 	Write_rows: table id # flags: STMT_END_F
 ### INSERT INTO test.t1
 ### SET
-###   @1=b'00000001' /* BIT(8) meta=256 nullable=1 is_null=0 */
+###   @1=b'1' /* BIT(1) meta=1 nullable=1 is_null=0 */
 ###   @2=b'1111111111111111111111111111111111111111111111111111111111111111' /* BIT(64) meta=2048 nullable=1 is_null=0 */
 ###   @3=127 /* TINYINT meta=0 nullable=1 is_null=0 */
 ###   @4=-1 (255) /* TINYINT meta=0 nullable=1 is_null=0 */
@@ -2553,7 +2553,7 @@ BEGIN
 #010909  4:46:40 server id 1  end_log_pos # 	Write_rows: table id # flags: STMT_END_F
 ### INSERT INTO test.t1
 ### SET
-###   @1=NULL /* type=16 meta=256 nullable=1 is_null=1 */
+###   @1=NULL /* type=16 meta=1 nullable=1 is_null=1 */
 ###   @2=NULL /* type=16 meta=2048 nullable=1 is_null=1 */
 ###   @3=NULL /* type=1 meta=0 nullable=1 is_null=1 */
 ###   @4=NULL /* type=1 meta=0 nullable=1 is_null=1 */
@@ -2634,7 +2634,7 @@ BEGIN
 ###   @79=3 /* INT meta=0 nullable=1 is_null=0 */
 ### INSERT INTO test.t1
 ### SET
-###   @1=b'00000001' /* BIT(8) meta=256 nullable=1 is_null=0 */
+###   @1=b'1' /* BIT(1) meta=1 nullable=1 is_null=0 */
 ###   @2=b'1111111111111111111111111111111111111111111111111111111111111111' /* BIT(64) meta=2048 nullable=1 is_null=0 */
 ###   @3=127 /* TINYINT meta=0 nullable=1 is_null=0 */
 ###   @4=0 /* TINYINT meta=0 nullable=1 is_null=0 */
@@ -2727,7 +2727,7 @@ BEGIN
 #010909  4:46:40 server id 1  end_log_pos # 	Update_rows: table id # flags: STMT_END_F
 ### UPDATE test.t1
 ### WHERE
-###   @1=b'00000000' /* BIT(8) meta=256 nullable=1 is_null=0 */
+###   @1=b'0' /* BIT(1) meta=1 nullable=1 is_null=0 */
 ###   @2=b'0000000000000000000000000000000000000000000000000000000000000000' /* BIT(64) meta=2048 nullable=1 is_null=0 */
 ###   @3=-128 (128) /* TINYINT meta=0 nullable=1 is_null=0 */
 ###   @4=0 /* TINYINT meta=0 nullable=1 is_null=0 */
@@ -2807,7 +2807,7 @@ BEGIN
 ###   @78=b'00000000' /* SET(1 bytes) meta=63489 nullable=1 is_null=0 */
 ###   @79=1 /* INT meta=0 nullable=1 is_null=0 */
 ### SET
-###   @1=b'00000001' /* BIT(8) meta=256 nullable=1 is_null=0 */
+###   @1=b'1' /* BIT(1) meta=1 nullable=1 is_null=0 */
 ###   @2=b'1111111111111111111111111111111111111111111111111111111111111111' /* BIT(64) meta=2048 nullable=1 is_null=0 */
 ###   @3=127 /* TINYINT meta=0 nullable=1 is_null=0 */
 ###   @4=-1 (255) /* TINYINT meta=0 nullable=1 is_null=0 */
@@ -2900,7 +2900,7 @@ BEGIN
 #010909  4:46:40 server id 1  end_log_pos # 	Update_rows: table id # flags: STMT_END_F
 ### UPDATE test.t1
 ### WHERE
-###   @1=b'00000001' /* BIT(8) meta=256 nullable=1 is_null=0 */
+###   @1=b'1' /* BIT(1) meta=1 nullable=1 is_null=0 */
 ###   @2=b'1111111111111111111111111111111111111111111111111111111111111111' /* BIT(64) meta=2048 nullable=1 is_null=0 */
 ###   @3=127 /* TINYINT meta=0 nullable=1 is_null=0 */
 ###   @4=-1 (255) /* TINYINT meta=0 nullable=1 is_null=0 */
@@ -2980,7 +2980,7 @@ BEGIN
 ###   @78=b'00000111' /* SET(1 bytes) meta=63489 nullable=1 is_null=0 */
 ###   @79=2 /* INT meta=0 nullable=1 is_null=0 */
 ### SET
-###   @1=b'00000000' /* BIT(8) meta=256 nullable=1 is_null=0 */
+###   @1=b'0' /* BIT(1) meta=1 nullable=1 is_null=0 */
 ###   @2=b'0000000000000000000000000000000000000000000000000000000000000000' /* BIT(64) meta=2048 nullable=1 is_null=0 */
 ###   @3=-128 (128) /* TINYINT meta=0 nullable=1 is_null=0 */
 ###   @4=0 /* TINYINT meta=0 nullable=1 is_null=0 */
@@ -3073,7 +3073,7 @@ BEGIN
 #010909  4:46:40 server id 1  end_log_pos # 	Update_rows: table id # flags: STMT_END_F
 ### UPDATE test.t1
 ### WHERE
-###   @1=NULL /* type=16 meta=256 nullable=1 is_null=1 */
+###   @1=NULL /* type=16 meta=1 nullable=1 is_null=1 */
 ###   @2=NULL /* type=16 meta=2048 nullable=1 is_null=1 */
 ###   @3=NULL /* type=1 meta=0 nullable=1 is_null=1 */
 ###   @4=NULL /* type=1 meta=0 nullable=1 is_null=1 */
@@ -3153,7 +3153,7 @@ BEGIN
 ###   @78=NULL /* TIMESTAMP meta=63489 nullable=1 is_null=1 */
 ###   @79=3 /* INT meta=0 nullable=1 is_null=0 */
 ### SET
-###   @1=b'00000001' /* BIT(8) meta=256 nullable=1 is_null=0 */
+###   @1=b'1' /* BIT(1) meta=1 nullable=1 is_null=0 */
 ###   @2=b'1111111111111111111111111111111111111111111111111111111111111111' /* BIT(64) meta=2048 nullable=1 is_null=0 */
 ###   @3=127 /* TINYINT meta=0 nullable=1 is_null=0 */
 ###   @4=0 /* TINYINT meta=0 nullable=1 is_null=0 */
@@ -3246,7 +3246,7 @@ BEGIN
 #010909  4:46:40 server id 1  end_log_pos # 	Update_rows: table id # flags: STMT_END_F
 ### UPDATE test.t1
 ### WHERE
-###   @1=b'00000001' /* BIT(8) meta=256 nullable=1 is_null=0 */
+###   @1=b'1' /* BIT(1) meta=1 nullable=1 is_null=0 */
 ###   @2=b'1111111111111111111111111111111111111111111111111111111111111111' /* BIT(64) meta=2048 nullable=1 is_null=0 */
 ###   @3=127 /* TINYINT meta=0 nullable=1 is_null=0 */
 ###   @4=0 /* TINYINT meta=0 nullable=1 is_null=0 */
@@ -3326,7 +3326,7 @@ BEGIN
 ###   @78=b'00000110' /* SET(1 bytes) meta=63489 nullable=1 is_null=0 */
 ###   @79=4 /* INT meta=0 nullable=1 is_null=0 */
 ### SET
-###   @1=NULL /* type=16 meta=256 nullable=1 is_null=1 */
+###   @1=NULL /* type=16 meta=1 nullable=1 is_null=1 */
 ###   @2=NULL /* type=16 meta=2048 nullable=1 is_null=1 */
 ###   @3=NULL /* type=1 meta=0 nullable=1 is_null=1 */
 ###   @4=NULL /* type=1 meta=0 nullable=1 is_null=1 */
@@ -3419,7 +3419,7 @@ BEGIN
 #010909  4:46:40 server id 1  end_log_pos # 	Delete_rows: table id # flags: STMT_END_F
 ### DELETE FROM test.t1
 ### WHERE
-###   @1=b'00000001' /* BIT(8) meta=256 nullable=1 is_null=0 */
+###   @1=b'1' /* BIT(1) meta=1 nullable=1 is_null=0 */
 ###   @2=b'1111111111111111111111111111111111111111111111111111111111111111' /* BIT(64) meta=2048 nullable=1 is_null=0 */
 ###   @3=127 /* TINYINT meta=0 nullable=1 is_null=0 */
 ###   @4=-1 (255) /* TINYINT meta=0 nullable=1 is_null=0 */
@@ -3512,7 +3512,7 @@ BEGIN
 #010909  4:46:40 server id 1  end_log_pos # 	Delete_rows: table id # flags: STMT_END_F
 ### DELETE FROM test.t1
 ### WHERE
-###   @1=b'00000000' /* BIT(8) meta=256 nullable=1 is_null=0 */
+###   @1=b'0' /* BIT(1) meta=1 nullable=1 is_null=0 */
 ###   @2=b'0000000000000000000000000000000000000000000000000000000000000000' /* BIT(64) meta=2048 nullable=1 is_null=0 */
 ###   @3=-128 (128) /* TINYINT meta=0 nullable=1 is_null=0 */
 ###   @4=0 /* TINYINT meta=0 nullable=1 is_null=0 */
@@ -3605,7 +3605,7 @@ BEGIN
 #010909  4:46:40 server id 1  end_log_pos # 	Delete_rows: table id # flags: STMT_END_F
 ### DELETE FROM test.t1
 ### WHERE
-###   @1=b'00000001' /* BIT(8) meta=256 nullable=1 is_null=0 */
+###   @1=b'1' /* BIT(1) meta=1 nullable=1 is_null=0 */
 ###   @2=b'1111111111111111111111111111111111111111111111111111111111111111' /* BIT(64) meta=2048 nullable=1 is_null=0 */
 ###   @3=127 /* TINYINT meta=0 nullable=1 is_null=0 */
 ###   @4=0 /* TINYINT meta=0 nullable=1 is_null=0 */
@@ -3698,7 +3698,7 @@ BEGIN
 #010909  4:46:40 server id 1  end_log_pos # 	Delete_rows: table id # flags: STMT_END_F
 ### DELETE FROM test.t1
 ### WHERE
-###   @1=NULL /* type=16 meta=256 nullable=1 is_null=1 */
+###   @1=NULL /* type=16 meta=1 nullable=1 is_null=1 */
 ###   @2=NULL /* type=16 meta=2048 nullable=1 is_null=1 */
 ###   @3=NULL /* type=1 meta=0 nullable=1 is_null=1 */
 ###   @4=NULL /* type=1 meta=0 nullable=1 is_null=1 */
diff --git a/mysql-test/r/type_year.result b/mysql-test/r/type_year.result
index 56b326327c6..8948214f565 100644
--- a/mysql-test/r/type_year.result
+++ b/mysql-test/r/type_year.result
@@ -309,4 +309,36 @@ yyyy	c4
 2069	2069
 DROP TABLE t2, t4;
 #
+# Bug #49910: Behavioural change in SELECT/WHERE on YEAR(4) data type
+#
+CREATE TABLE t1 (y YEAR NOT NULL, s VARCHAR(4));
+INSERT INTO t1 (s) VALUES ('bad');
+Warnings:
+Warning	1364	Field 'y' doesn't have a default value
+INSERT INTO t1 (y, s) VALUES (0, 0), (2000, 2000), (2001, 2001);
+SELECT * FROM t1 ta, t1 tb WHERE ta.y = tb.y;
+y	s	y	s
+0000	bad	0000	bad
+0000	0	0000	bad
+0000	bad	0000	0
+0000	0	0000	0
+2000	2000	2000	2000
+2001	2001	2001	2001
+SELECT * FROM t1 WHERE t1.y = 0;
+y	s
+0000	bad
+0000	0
+SELECT * FROM t1 WHERE t1.y = 2000;
+y	s
+2000	2000
+SELECT ta.y AS ta_y, ta.s, tb.y AS tb_y, tb.s FROM t1 ta, t1 tb HAVING ta_y = tb_y;
+ta_y	s	tb_y	s
+0000	bad	0000	bad
+0000	0	0000	bad
+0000	bad	0000	0
+0000	0	0000	0
+2000	2000	2000	2000
+2001	2001	2001	2001
+DROP TABLE t1;
+#
 End of 5.1 tests
diff --git a/mysql-test/r/udf.result b/mysql-test/r/udf.result
index 601b364fbbe..4104ca44e66 100644
--- a/mysql-test/r/udf.result
+++ b/mysql-test/r/udf.result
@@ -38,8 +38,6 @@ ERROR HY000: Can't initialize function 'reverse_lookup'; Wrong number of argumen
 select reverse_lookup("127.0.0.1");
 select reverse_lookup(127,0,0,1);
 select reverse_lookup("localhost");
-reverse_lookup("localhost")
-NULL
 select avgcost();
 ERROR HY000: Can't initialize function 'avgcost'; wrong number of arguments: AVGCOST() requires two arguments
 select avgcost(100,23.76);
diff --git a/mysql-test/suite/rpl/r/rpl_get_master_version_and_clock.result b/mysql-test/suite/rpl/r/rpl_get_master_version_and_clock.result
index d054cb573d3..a34c536feb8 100644
--- a/mysql-test/suite/rpl/r/rpl_get_master_version_and_clock.result
+++ b/mysql-test/suite/rpl/r/rpl_get_master_version_and_clock.result
@@ -7,34 +7,24 @@ start slave;
 call mtr.add_suppression("Slave I/O: Master command COM_REGISTER_SLAVE failed: .*");
 call mtr.add_suppression("Fatal error: The slave I/O thread stops because master and slave have equal MySQL server ids; .*");
 call mtr.add_suppression("Slave I/O thread .* register on master");
-SELECT IS_FREE_LOCK("debug_lock.before_get_UNIX_TIMESTAMP");
-IS_FREE_LOCK("debug_lock.before_get_UNIX_TIMESTAMP")
-1
-SELECT GET_LOCK("debug_lock.before_get_UNIX_TIMESTAMP", 1000);
-GET_LOCK("debug_lock.before_get_UNIX_TIMESTAMP", 1000)
-1
-set global debug= 'd,debug_lock.before_get_UNIX_TIMESTAMP';
 stop slave;
+SET @@global.debug= "+d,'debug_lock.before_get_UNIX_TIMESTAMP'";
 start slave;
-SELECT RELEASE_LOCK("debug_lock.before_get_UNIX_TIMESTAMP");
-RELEASE_LOCK("debug_lock.before_get_UNIX_TIMESTAMP")
-1
+slave is going to hang in get_master_version_and_clock
+slave is unblocked
+SET DEBUG_SYNC='now SIGNAL signal.get_unix_timestamp';
 Check network error happened here
 NETWORK ERROR
-SELECT IS_FREE_LOCK("debug_lock.before_get_SERVER_ID");
-IS_FREE_LOCK("debug_lock.before_get_SERVER_ID")
-1
-SELECT GET_LOCK("debug_lock.before_get_SERVER_ID", 1000);
-GET_LOCK("debug_lock.before_get_SERVER_ID", 1000)
-1
-set global debug= 'd,debug_lock.before_get_SERVER_ID';
+set @@global.debug = "-d,'debug_lock.before_get_UNIX_TIMESTAMP'";
 stop slave;
+SET @@global.debug= "+d,'debug_lock.before_get_SERVER_ID'";
 start slave;
-SELECT RELEASE_LOCK("debug_lock.before_get_SERVER_ID");
-RELEASE_LOCK("debug_lock.before_get_SERVER_ID")
-1
+slave is going to hang in get_master_version_and_clock
+slave is unblocked
+SET DEBUG_SYNC='now SIGNAL signal.get_server_id';
 Check network error happened here
 NETWORK ERROR
+set @@global.debug = "-d,'debug_lock.before_get_SERVER_ID'";
 set global debug= '';
 reset master;
 include/stop_slave.inc
@@ -43,3 +33,4 @@ start slave;
 *** must be having the replicate-same-server-id IO thread error ***
 Slave_IO_Errno= 1593
 Slave_IO_Error= Fatal error: The slave I/O thread stops because master and slave have equal MySQL server ids; these ids must be different for replication to work (or the --replicate-same-server-id option must be used on slave but this does not always make sense; please check the manual before using it).
+SET DEBUG_SYNC= 'RESET';
diff --git a/mysql-test/suite/rpl/r/rpl_show_slave_running.result b/mysql-test/suite/rpl/r/rpl_show_slave_running.result
index da26190e76d..598762d5188 100644
--- a/mysql-test/suite/rpl/r/rpl_show_slave_running.result
+++ b/mysql-test/suite/rpl/r/rpl_show_slave_running.result
@@ -4,11 +4,9 @@ reset master;
 reset slave;
 drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
 start slave;
+SET DEBUG_SYNC= 'RESET';
 include/stop_slave.inc
-SELECT GET_LOCK("debug_lock.before_get_running_status_yes", 1000);
-GET_LOCK("debug_lock.before_get_running_status_yes", 1000)
-1
-set global debug= 'd,debug_lock.before_get_running_status_yes';
+set global debug= 'd,dbug.before_get_running_status_yes';
 Slave_running, Slave_IO_Running, Slave_SQL_Running, must be OFF, NO, NO in three following queries
 SHOW STATUS LIKE 'Slave_running';
 Variable_name	Value
@@ -22,9 +20,7 @@ Variable_name	Value
 Slave_running	OFF
 Slave_IO_Running= No
 Slave_SQL_Running= No
-SELECT RELEASE_LOCK("debug_lock.before_get_running_status_yes");
-RELEASE_LOCK("debug_lock.before_get_running_status_yes")
-1
+SET DEBUG_SYNC='now SIGNAL signal.io_thread_let_running';
 Slave_running, Slave_IO_Running, Slave_SQL_Running must be OFF YES NO in three following queries
 SHOW STATUS LIKE 'Slave_running';
 Variable_name	Value
@@ -39,4 +35,5 @@ Slave_running	ON
 Slave_IO_Running= Yes
 Slave_SQL_Running= Yes
 set global debug= '';
+SET DEBUG_SYNC= 'RESET';
 End of tests
diff --git a/mysql-test/suite/rpl/t/rpl_get_master_version_and_clock.test b/mysql-test/suite/rpl/t/rpl_get_master_version_and_clock.test
index eb9a8d1362d..772f724ddd8 100644
--- a/mysql-test/suite/rpl/t/rpl_get_master_version_and_clock.test
+++ b/mysql-test/suite/rpl/t/rpl_get_master_version_and_clock.test
@@ -16,8 +16,16 @@
 
 source include/master-slave.inc;
 source include/have_debug.inc;
+source include/have_debug_sync.inc;
+
+#
+# The test is not supposed to have any binglog affairs.
+# Hence it's enough it to run only with one binlog format
+#
+source include/have_binlog_format_mixed.inc;
 
 connection slave;
+
 call mtr.add_suppression("Slave I/O: .* failed with error: Lost connection to MySQL server at 'reading initial communication packet'");
 call mtr.add_suppression("Slave I/O: Master command COM_REGISTER_SLAVE failed: .*");
 call mtr.add_suppression("Fatal error: The slave I/O thread stops because master and slave have equal MySQL server ids; .*");
@@ -26,20 +34,16 @@ call mtr.add_suppression("Slave I/O thread .* register on master");
 #Test case 1: Try to get the value of the UNIX_TIMESTAMP from master under network disconnection
 let $debug_saved= `select @@global.debug`;
 
-let $debug_lock= "debug_lock.before_get_UNIX_TIMESTAMP";
-eval SELECT IS_FREE_LOCK($debug_lock);
-eval SELECT GET_LOCK($debug_lock, 1000);
-
-set global debug= 'd,debug_lock.before_get_UNIX_TIMESTAMP';
+# set up two parameters to pass into extra/rpl_tests/rpl_get_master_version_and_clock
+let $dbug_sync_point= 'debug_lock.before_get_UNIX_TIMESTAMP';
+let $debug_sync_action= 'now SIGNAL signal.get_unix_timestamp';
 source extra/rpl_tests/rpl_get_master_version_and_clock.test; 
 
 #Test case 2: Try to get the value of the SERVER_ID from master under network disconnection
 connection slave;
-let $debug_lock= "debug_lock.before_get_SERVER_ID";
-eval SELECT IS_FREE_LOCK($debug_lock);
-eval SELECT GET_LOCK($debug_lock, 1000);
 
-set global debug= 'd,debug_lock.before_get_SERVER_ID';
+let $dbug_sync_point= 'debug_lock.before_get_SERVER_ID';
+let $debug_sync_action= 'now SIGNAL signal.get_server_id';
 source extra/rpl_tests/rpl_get_master_version_and_clock.test;
 
 eval set global debug= '$debug_saved';
@@ -63,4 +67,9 @@ let $last_io_error= query_get_value("show slave status", Last_IO_Error, 1);
 echo Slave_IO_Errno= $last_io_errno;
 echo Slave_IO_Error= $last_io_error;
 
+# cleanup
+
+# is not really necessary but avoids mtr post-run env check warnings
+SET DEBUG_SYNC= 'RESET';
+
 # End of tests
diff --git a/mysql-test/suite/rpl/t/rpl_show_slave_running.test b/mysql-test/suite/rpl/t/rpl_show_slave_running.test
index 62cc311e6b2..8a3e56975ad 100644
--- a/mysql-test/suite/rpl/t/rpl_show_slave_running.test
+++ b/mysql-test/suite/rpl/t/rpl_show_slave_running.test
@@ -5,14 +5,14 @@
 #
 source include/master-slave.inc;
 source include/have_debug.inc;
+source include/have_debug_sync.inc;
 
 connection slave;
-
+SET DEBUG_SYNC= 'RESET';
 source include/stop_slave.inc;
 let $debug_saved= `select @@global.debug`;
-let $debug_lock= "debug_lock.before_get_running_status_yes";
-eval SELECT GET_LOCK($debug_lock, 1000);
-set global debug= 'd,debug_lock.before_get_running_status_yes';
+set global debug= 'd,dbug.before_get_running_status_yes'; # to block due-started IO
+
 
 # Test 1. Slave is stopped
 
@@ -29,6 +29,12 @@ echo Slave_SQL_Running= $status;
 
 start slave io_thread;
 
+#
+# Notice a difference between versions in showing p.2: 
+# 5.1 has two OFF,ON IO-thread state running state whereas later versions
+# have three: OFF,Connecting,ON.
+# Hence, 5.1 must display OFF NO NO where as 5.1+ OFF Connecting NO
+#
 --echo Slave_running, Slave_IO_Running, Slave_SQL_Running must be OFF NO NO in three following queries
 
 SHOW STATUS LIKE 'Slave_running';
@@ -40,7 +46,7 @@ echo Slave_SQL_Running= $status;
 # Test 3. The slave IO thread is started and got connected to master
 #         and SQL thread is still not started
 
-eval SELECT RELEASE_LOCK($debug_lock);
+SET DEBUG_SYNC='now SIGNAL signal.io_thread_let_running'; # unblock IO thread now
 let $slave_param= Slave_IO_Running;
 let $slave_param_value= YES;
 source include/wait_for_slave_param.inc;
@@ -72,5 +78,5 @@ echo Slave_SQL_Running= $status;
 connection slave;
 
 eval set global debug= '$debug_saved';
-
+SET DEBUG_SYNC= 'RESET';
 --echo End of tests
diff --git a/mysql-test/t/ctype_ldml.test b/mysql-test/t/ctype_ldml.test
index d134861cd46..8166d3014ce 100644
--- a/mysql-test/t/ctype_ldml.test
+++ b/mysql-test/t/ctype_ldml.test
@@ -46,6 +46,14 @@ SELECT * FROM t1 WHERE LOWER(a)=LOWER('N');
 DROP TABLE t1;
 
 --echo #
+--echo # Bug#51976 LDML collations issue (cyrillic example)
+--echo #
+CREATE TABLE t1 (a VARCHAR(10) CHARACTER SET utf8 COLLATE utf8_test_ci);
+INSERT INTO t1 (a) VALUES ('Hello');
+SELECT a, UPPER(a), LOWER(a) FROM t1;
+DROP TABLE t1;
+
+--echo #
 --echo # Bug#43827 Server closes connections and restarts
 --echo #
 # Crash happened with a user-defined utf8 collation,
diff --git a/mysql-test/t/type_year.test b/mysql-test/t/type_year.test
index 16fd39a59d8..d8da4ccc82c 100644
--- a/mysql-test/t/type_year.test
+++ b/mysql-test/t/type_year.test
@@ -134,5 +134,21 @@ SELECT * FROM t4 WHERE yyyy > 123;
 DROP TABLE t2, t4;
 
 --echo #
+--echo # Bug #49910: Behavioural change in SELECT/WHERE on YEAR(4) data type
+--echo #
+
+CREATE TABLE t1 (y YEAR NOT NULL, s VARCHAR(4));
+INSERT INTO t1 (s) VALUES ('bad');
+INSERT INTO t1 (y, s) VALUES (0, 0), (2000, 2000), (2001, 2001);
+
+SELECT * FROM t1 ta, t1 tb WHERE ta.y = tb.y;
+SELECT * FROM t1 WHERE t1.y = 0;
+SELECT * FROM t1 WHERE t1.y = 2000;
+
+SELECT ta.y AS ta_y, ta.s, tb.y AS tb_y, tb.s FROM t1 ta, t1 tb HAVING ta_y = tb_y;
+
+DROP TABLE t1;
+
+--echo #
 
 --echo End of 5.1 tests
diff --git a/mysql-test/t/udf.test b/mysql-test/t/udf.test
index 7bf252040e5..9295969c05f 100644
--- a/mysql-test/t/udf.test
+++ b/mysql-test/t/udf.test
@@ -51,14 +51,17 @@ select lookup("localhost");
 --error ER_CANT_INITIALIZE_UDF
 select reverse_lookup();
 
-# These two functions should return "localhost", but it's
+# These two function calls should return "localhost", but it's
 # depending on configuration, so just call them and don't log the result
 --disable_result_log
 select reverse_lookup("127.0.0.1");
 select reverse_lookup(127,0,0,1);
---enable_result_log
 
+# This function call may return different results depending on platform,
+# so ignore results (see Bug#52060).
 select reverse_lookup("localhost");
+--enable_result_log
+
 --error ER_CANT_INITIALIZE_UDF
 select avgcost();
 --error ER_CANT_INITIALIZE_UDF
diff --git a/mysys/charset.c b/mysys/charset.c
index ba78838b298..ab89a259481 100644
--- a/mysys/charset.c
+++ b/mysys/charset.c
@@ -245,6 +245,8 @@ static int add_collation(CHARSET_INFO *cs)
       if (cs_copy_data(all_charsets[cs->number],cs))
         return MY_XML_ERROR;
 
+      newcs->caseup_multiply= newcs->casedn_multiply= 1;
+
       if (!strcmp(cs->csname,"ucs2") )
       {
 #if defined(HAVE_CHARSET_ucs2) && defined(HAVE_UCA_COLLATIONS)
diff --git a/sql/debug_sync.cc b/sql/debug_sync.cc
index 81870e6b7a3..268e294563d 100644
--- a/sql/debug_sync.cc
+++ b/sql/debug_sync.cc
@@ -1905,4 +1905,42 @@ void debug_sync(THD *thd, const char *sync_point_name, size_t name_len)
   DBUG_VOID_RETURN;
 }
 
+/**
+  Define debug sync action.
+
+  @param[in]        thd             thread handle
+  @param[in]        action_str      action string
+
+  @return           status
+    @retval         FALSE           ok
+    @retval         TRUE            error
+
+  @description
+    The function is similar to @c debug_sync_eval_action but is
+    to be called immediately from the server code rather than 
+    to be triggered by setting a value to DEBUG_SYNC system variable.
+
+  @note
+    The input string is copied prior to be fed to
+    @c debug_sync_eval_action to let the latter modify it.
+
+    Caution.
+    The function allocates in THD::mem_root and therefore
+    is not recommended to be deployed inside big loops.    
+*/
+
+bool debug_sync_set_action(THD *thd, const char *action_str, size_t len)
+{
+  bool                  rc;
+  char *value;
+  DBUG_ENTER("debug_sync_set_action");
+  DBUG_ASSERT(thd);
+  DBUG_ASSERT(action_str);
+  
+  value= strmake_root(thd->mem_root, action_str, len);
+  rc= debug_sync_eval_action(thd, value);
+  DBUG_RETURN(rc);
+}
+
+
 #endif /* defined(ENABLED_DEBUG_SYNC) */
diff --git a/sql/debug_sync.h b/sql/debug_sync.h
index f4cd0b364cf..9ac7da39d4d 100644
--- a/sql/debug_sync.h
+++ b/sql/debug_sync.h
@@ -50,6 +50,7 @@ extern void debug_sync_end(void);
 extern void debug_sync_init_thread(THD *thd);
 extern void debug_sync_end_thread(THD *thd);
 extern void debug_sync(THD *thd, const char *sync_point_name, size_t name_len);
+extern bool debug_sync_set_action(THD *thd, const char *action_str, size_t len);
 
 #else /* defined(ENABLED_DEBUG_SYNC) */
 
diff --git a/sql/item_cmpfunc.cc b/sql/item_cmpfunc.cc
index cd3f18fe1eb..6e38220abd1 100644
--- a/sql/item_cmpfunc.cc
+++ b/sql/item_cmpfunc.cc
@@ -1190,12 +1190,21 @@ get_year_value(THD *thd, Item ***item_arg, Item **cache_arg,
   /*
     Coerce value to the 19XX form in order to correctly compare
     YEAR(2) & YEAR(4) types.
+    Here we are converting all item values but YEAR(4) fields since
+      1) YEAR(4) already has a regular YYYY form and
+      2) we don't want to convert zero/bad YEAR(4) values to the
+         value of 2000.
   */
-  if (value < 70)
-    value+= 100;
-  if (value <= 1900)
-    value+= 1900;
-
+  Item *real_item= item->real_item();
+  if (!(real_item->type() == Item::FIELD_ITEM &&
+        ((Item_field *)real_item)->field->type() == MYSQL_TYPE_YEAR &&
+        ((Item_field *)real_item)->field->field_length == 4))
+  {
+    if (value < 70)
+      value+= 100;
+    if (value <= 1900)
+      value+= 1900;
+  }
   /* Convert year to DATETIME of form YYYY-00-00 00:00:00 (YYYY0000000000). */
   value*= 10000000000LL;
 
diff --git a/sql/item_func.cc b/sql/item_func.cc
index 198e77b225a..2c1da9e4560 100644
--- a/sql/item_func.cc
+++ b/sql/item_func.cc
@@ -3362,80 +3362,6 @@ longlong Item_master_pos_wait::val_int()
   return event_count;
 }
 
-#ifdef EXTRA_DEBUG
-void debug_sync_point(const char* lock_name, uint lock_timeout)
-{
-  THD* thd=current_thd;
-  User_level_lock* ull;
-  struct timespec abstime;
-  size_t lock_name_len;
-  lock_name_len= strlen(lock_name);
-  pthread_mutex_lock(&LOCK_user_locks);
-
-  if (thd->ull)
-  {
-    item_user_lock_release(thd->ull);
-    thd->ull=0;
-  }
-
-  /*
-    If the lock has not been aquired by some client, we do not want to
-    create an entry for it, since we immediately release the lock. In
-    this case, we will not be waiting, but rather, just waste CPU and
-    memory on the whole deal
-  */
-  if (!(ull= ((User_level_lock*) my_hash_search(&hash_user_locks,
-                                                (uchar*) lock_name,
-                                                lock_name_len))))
-  {
-    pthread_mutex_unlock(&LOCK_user_locks);
-    return;
-  }
-  ull->count++;
-
-  /*
-    Structure is now initialized.  Try to get the lock.
-    Set up control struct to allow others to abort locks
-  */
-  thd_proc_info(thd, "User lock");
-  thd->mysys_var->current_mutex= &LOCK_user_locks;
-  thd->mysys_var->current_cond=  &ull->cond;
-
-  set_timespec(abstime,lock_timeout);
-  while (ull->locked && !thd->killed)
-  {
-    int error= pthread_cond_timedwait(&ull->cond, &LOCK_user_locks, &abstime);
-    if (error == ETIMEDOUT || error == ETIME)
-      break;
-  }
-
-  if (ull->locked)
-  {
-    if (!--ull->count)
-      delete ull;				// Should never happen
-  }
-  else
-  {
-    ull->locked=1;
-    ull->set_thread(thd);
-    thd->ull=ull;
-  }
-  pthread_mutex_unlock(&LOCK_user_locks);
-  pthread_mutex_lock(&thd->mysys_var->mutex);
-  thd_proc_info(thd, 0);
-  thd->mysys_var->current_mutex= 0;
-  thd->mysys_var->current_cond=  0;
-  pthread_mutex_unlock(&thd->mysys_var->mutex);
-  pthread_mutex_lock(&LOCK_user_locks);
-  if (thd->ull)
-  {
-    item_user_lock_release(thd->ull);
-    thd->ull=0;
-  }
-  pthread_mutex_unlock(&LOCK_user_locks);
-}
-
-#endif
 
 /**
   Get a user level lock.  If the thread has an old lock this is first released.
diff --git a/sql/mysql_priv.h b/sql/mysql_priv.h
index e06147b8780..0eb41174b30 100644
--- a/sql/mysql_priv.h
+++ b/sql/mysql_priv.h
@@ -615,20 +615,6 @@ protected:
 
 /* Used to check GROUP BY list in the MODE_ONLY_FULL_GROUP_BY mode */
 #define UNDEF_POS (-1)
-#ifdef EXTRA_DEBUG
-/**
-  Sync points allow us to force the server to reach a certain line of code
-  and block there until the client tells the server it is ok to go on.
-  The client tells the server to block with SELECT GET_LOCK()
-  and unblocks it with SELECT RELEASE_LOCK(). Used for debugging difficult
-  concurrency problems
-*/
-#define DBUG_SYNC_POINT(lock_name,lock_timeout) \
- debug_sync_point(lock_name,lock_timeout)
-void debug_sync_point(const char* lock_name, uint lock_timeout);
-#else
-#define DBUG_SYNC_POINT(lock_name,lock_timeout)
-#endif /* EXTRA_DEBUG */
 
 /* BINLOG_DUMP options */
 
diff --git a/sql/slave.cc b/sql/slave.cc
index 60fd66382a9..9ad382a5cd0 100644
--- a/sql/slave.cc
+++ b/sql/slave.cc
@@ -45,6 +45,7 @@
 #ifdef HAVE_REPLICATION
 
 #include "rpl_tblmap.h"
+#include "debug_sync.h"
 
 #define FLAGSTR(V,F) ((V)&(F)?#F" ":"")
 
@@ -1213,7 +1214,16 @@ static int get_master_version_and_clock(MYSQL* mysql, Master_info* mi)
     unavailable (very old master not supporting UNIX_TIMESTAMP()?).
   */
 
-  DBUG_SYNC_POINT("debug_lock.before_get_UNIX_TIMESTAMP", 10);
+  DBUG_EXECUTE_IF("dbug.before_get_UNIX_TIMESTAMP",
+                  {
+                    const char act[]=
+                      "now "
+                      "wait_for signal.get_unix_timestamp";
+                    DBUG_ASSERT(opt_debug_sync_timeout > 0);
+                    DBUG_ASSERT(!debug_sync_set_action(current_thd,
+                                                       STRING_WITH_LEN(act)));
+                  };);
+
   master_res= NULL;
   if (!mysql_real_query(mysql, STRING_WITH_LEN("SELECT UNIX_TIMESTAMP()")) &&
       (master_res= mysql_store_result(mysql)) &&
@@ -1252,7 +1262,15 @@ static int get_master_version_and_clock(MYSQL* mysql, Master_info* mi)
     Note: we could have put a @@SERVER_ID in the previous SELECT
     UNIX_TIMESTAMP() instead, but this would not have worked on 3.23 masters.
   */
-  DBUG_SYNC_POINT("debug_lock.before_get_SERVER_ID", 10);
+  DBUG_EXECUTE_IF("dbug.before_get_SERVER_ID",
+                  {
+                    const char act[]=
+                      "now "
+                      "wait_for signal.get_server_id";
+                    DBUG_ASSERT(opt_debug_sync_timeout > 0);
+                    DBUG_ASSERT(!debug_sync_set_action(current_thd, 
+                                                       STRING_WITH_LEN(act)));
+                  };);
   master_res= NULL;
   master_row= NULL;
   if (!mysql_real_query(mysql,
@@ -2877,7 +2895,16 @@ pthread_handler_t handle_slave_io(void *arg)
 
 connected:
 
-  DBUG_SYNC_POINT("debug_lock.before_get_running_status_yes", 10);
+    DBUG_EXECUTE_IF("dbug.before_get_running_status_yes",
+                    {
+                      const char act[]=
+                        "now "
+                        "wait_for signal.io_thread_let_running";
+                      DBUG_ASSERT(opt_debug_sync_timeout > 0);
+                      DBUG_ASSERT(!debug_sync_set_action(thd, 
+                                                         STRING_WITH_LEN(act)));
+                    };);
+
   // TODO: the assignment below should be under mutex (5.0)
   mi->slave_running= MYSQL_SLAVE_RUN_CONNECT;
   thd->slave_net = &mysql->net;
diff --git a/sql/sql_repl.cc b/sql/sql_repl.cc
index 6d1b93ea9ea..cc2a2b1d443 100644
--- a/sql/sql_repl.cc
+++ b/sql/sql_repl.cc
@@ -2003,7 +2003,6 @@ int log_loaded_block(IO_CACHE* file)
       if (mysql_bin_log.write(&b))
         DBUG_RETURN(1);
       lf_info->wrote_create_file= 1;
-      DBUG_SYNC_POINT("debug_lock.created_file_event",10);
     }
   }
   DBUG_RETURN(0);