diff --git a/mysql-test/r/func_time.result b/mysql-test/r/func_time.result
index d8ba606a55883c3d6c6668440987a6255e9024e3..47a0f83802c113fbd527583e763db52c5b8364c2 100644
--- a/mysql-test/r/func_time.result
+++ b/mysql-test/r/func_time.result
@@ -695,3 +695,24 @@ t1	CREATE TABLE `t1` (
   `from_unixtime(1) + 0` double(23,6) default NULL
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 drop table t1;
+(select time_format(timediff(now(), DATE_SUB(now(),INTERVAL 5 DAY)),'%H') As H)
+union
+(select time_format(timediff(now(), DATE_SUB(now(),INTERVAL 5 DAY)),'%H') As H);
+H
+120
+(select time_format(timediff(now(), DATE_SUB(now(),INTERVAL 5 DAY)),'%k') As H)
+union
+(select time_format(timediff(now(), DATE_SUB(now(),INTERVAL 5 DAY)),'%k') As H);
+H
+120
+(select time_format(timediff(now(), DATE_SUB(now(),INTERVAL 5 HOUR)),'%H') As H)
+union
+(select time_format(timediff(now(), DATE_SUB(now(),INTERVAL 5 HOUR)),'%H') As H);
+H
+05
+(select time_format(timediff(now(), DATE_SUB(now(),INTERVAL 5 HOUR)),'%k') As H)
+union
+(select time_format(timediff(now(), DATE_SUB(now(),INTERVAL 5 HOUR)),'%k') As H);
+H
+5
+End of 4.1 tests
diff --git a/mysql-test/r/mysql_client.result b/mysql-test/r/mysql_client.result
index 00d7b6df3cf0c3ba91429cef6202f249c4af384c..87d09428ff6fb631aab4cfdc77d679c0e9037d49 100644
--- a/mysql-test/r/mysql_client.result
+++ b/mysql-test/r/mysql_client.result
@@ -2,47 +2,3 @@
 1
 ERROR 1064 (42000) at line 3: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1
 ERROR at line 1: USE must be followed by a database name
-?         (\?) Synonym for `help'.
-clear     (\c) Clear command.
-connect   (\r) Reconnect to the server. Optional arguments are db and host.
-delimiter (\d) Set query delimiter. 
-edit      (\e) Edit command with $EDITOR.
-ego       (\G) Send command to mysql server, display result vertically.
-exit      (\q) Exit mysql. Same as quit.
-go        (\g) Send command to mysql server.
-help      (\h) Display this help.
-nopager   (\n) Disable pager, print to stdout.
-notee     (\t) Don't write into outfile.
-pager     (\P) Set PAGER [to_pager]. Print the query results via PAGER.
-print     (\p) Print current command.
-prompt    (\R) Change your mysql prompt.
-quit      (\q) Quit mysql.
-rehash    (\#) Rebuild completion hash.
-source    (\.) Execute an SQL script file. Takes a file name as an argument.
-status    (\s) Get status information from the server.
-system    (\!) Execute a system shell command.
-tee       (\T) Set outfile [to_outfile]. Append everything into given outfile.
-use       (\u) Use another database. Takes database name as argument.
-charset_name(\C) Switch to another charset. Might be needed for processing binlog.
-?         (\?) Synonym for `help'.
-clear     (\c) Clear command.
-connect   (\r) Reconnect to the server. Optional arguments are db and host.
-delimiter (\d) Set query delimiter. 
-edit      (\e) Edit command with $EDITOR.
-ego       (\G) Send command to mysql server, display result vertically.
-exit      (\q) Exit mysql. Same as quit.
-go        (\g) Send command to mysql server.
-help      (\h) Display this help.
-nopager   (\n) Disable pager, print to stdout.
-notee     (\t) Don't write into outfile.
-pager     (\P) Set PAGER [to_pager]. Print the query results via PAGER.
-print     (\p) Print current command.
-prompt    (\R) Change your mysql prompt.
-quit      (\q) Quit mysql.
-rehash    (\#) Rebuild completion hash.
-source    (\.) Execute an SQL script file. Takes a file name as an argument.
-status    (\s) Get status information from the server.
-system    (\!) Execute a system shell command.
-tee       (\T) Set outfile [to_outfile]. Append everything into given outfile.
-use       (\u) Use another database. Takes database name as argument.
-charset_name(\C) Switch to another charset. Might be needed for processing binlog.
diff --git a/mysql-test/t/func_time.test b/mysql-test/t/func_time.test
index b8647a281d4e66fc15c3c99985678d7346bb9260..472f3d81d2b2a9f6999fd6b480ce473263a76ce6 100644
--- a/mysql-test/t/func_time.test
+++ b/mysql-test/t/func_time.test
@@ -368,4 +368,22 @@ create table t1 select now() - now(), curtime() - curtime(),
 show create table t1;
 drop table t1;
 
-# End of 4.1 tests
+#
+# Bug #19844 time_format in Union truncates values
+#
+
+(select time_format(timediff(now(), DATE_SUB(now(),INTERVAL 5 DAY)),'%H') As H)
+union
+(select time_format(timediff(now(), DATE_SUB(now(),INTERVAL 5 DAY)),'%H') As H);
+(select time_format(timediff(now(), DATE_SUB(now(),INTERVAL 5 DAY)),'%k') As H)
+union
+(select time_format(timediff(now(), DATE_SUB(now(),INTERVAL 5 DAY)),'%k') As H);
+(select time_format(timediff(now(), DATE_SUB(now(),INTERVAL 5 HOUR)),'%H') As H)
+union
+(select time_format(timediff(now(), DATE_SUB(now(),INTERVAL 5 HOUR)),'%H') As H);
+
+(select time_format(timediff(now(), DATE_SUB(now(),INTERVAL 5 HOUR)),'%k') As H)
+union
+(select time_format(timediff(now(), DATE_SUB(now(),INTERVAL 5 HOUR)),'%k') As H);
+
+--echo End of 4.1 tests
diff --git a/mysql-test/t/mysql_client.test b/mysql-test/t/mysql_client.test
index 9cdf5aea64b5dbada43eafb1a1532f107e34ed9a..b382357dacf0f3144a0d47c3efed8a6e78d5e2a4 100644
--- a/mysql-test/t/mysql_client.test
+++ b/mysql-test/t/mysql_client.test
@@ -29,7 +29,7 @@
 --exec $MYSQL              < $MYSQLTEST_VARDIR/tmp/bug20432.sql 2>&1
 
 #
-# Bug #20328: mysql client interprets commands in comments
+# Bug #20328: mysql client: dumb about trailing spaces on 'help' command
 #
---exec echo 'help' | $MYSQL
---exec echo 'help ' | $MYSQL
+--exec echo 'help' | $MYSQL   >  $MYSQLTEST_VARDIR/tmp/bug20328.tmp
+--exec echo 'help ' | $MYSQL  >  $MYSQLTEST_VARDIR/tmp/bug20328.tmp
diff --git a/sql/item_timefunc.cc b/sql/item_timefunc.cc
index 44d9b4222637a968a85745cefba9eaa3a8b8f03c..febc92e34f6738511ffee8fe2d630b4205dc5aba 100644
--- a/sql/item_timefunc.cc
+++ b/sql/item_timefunc.cc
@@ -1600,14 +1600,12 @@ uint Item_func_date_format::format_length(const String *format)
       case 'u': /* week (00..52), where week starts with Monday */
       case 'V': /* week 1..53 used with 'x' */
       case 'v': /* week 1..53 used with 'x', where week starts with Monday */
-      case 'H': /* hour (00..23) */
       case 'y': /* year, numeric, 2 digits */
       case 'm': /* month, numeric */
       case 'd': /* day (of the month), numeric */
       case 'h': /* hour (01..12) */
       case 'I': /* --||-- */
       case 'i': /* minutes, numeric */
-      case 'k': /* hour ( 0..23) */
       case 'l': /* hour ( 1..12) */
       case 'p': /* locale's AM or PM */
       case 'S': /* second (00..61) */
@@ -1616,6 +1614,10 @@ uint Item_func_date_format::format_length(const String *format)
       case 'e': /* day (0..31) */
 	size += 2;
 	break;
+      case 'k': /* hour ( 0..23) */
+      case 'H': /* hour (00..23; value > 23 OK, padding always 2-digit) */
+	size += 7; /* docs allow > 23, range depends on sizeof(unsigned int) */
+	break;
       case 'r': /* time, 12-hour (hh:mm:ss [AP]M) */
 	size += 11;
 	break;
diff --git a/sql/slave.cc b/sql/slave.cc
index b2862a437bb4d30b342bd3df40f5968feeb67e85..bceeca1055cc709cc85b6b1ecce784c775a12826 100644
--- a/sql/slave.cc
+++ b/sql/slave.cc
@@ -2946,7 +2946,7 @@ static int exec_relay_log_event(THD* thd, RELAY_LOG_INFO* rli)
       rli->is_until_satisfied()) 
   {
     char buf[22];
-    sql_print_error("Slave SQL thread stopped because it reached its"
+    sql_print_information("Slave SQL thread stopped because it reached its"
                     " UNTIL position %s", llstr(rli->until_pos(), buf));
     /* 
       Setting abort_slave flag because we do not want additional message about
diff --git a/sql/sql_acl.cc b/sql/sql_acl.cc
index 734bccb6b465c31dc65fdd4a035e4511c89195bd..0ad5432f3ebf30fc40bafcfa9b67ba52049856f6 100644
--- a/sql/sql_acl.cc
+++ b/sql/sql_acl.cc
@@ -3671,17 +3671,11 @@ int mysql_drop_user(THD *thd, List <LEX_USER> &list)
   {
     if (!(acl_user= check_acl_user(user_name, &counter)))
     {
-      sql_print_error("DROP USER: Can't drop user: '%s'@'%s'; No such user",
-		      user_name->user.str,
-		      user_name->host.str);
       result= -1;
       continue;
     }
     if ((acl_user->access & ~0))
     {
-      sql_print_error("DROP USER: Can't drop user: '%s'@'%s'; Global privileges exists",
-		      user_name->user.str,
-		      user_name->host.str);
       result= -1;
       continue;
     }
@@ -3702,9 +3696,6 @@ int mysql_drop_user(THD *thd, List <LEX_USER> &list)
     }
     if (counter != acl_dbs.elements)
     {
-      sql_print_error("DROP USER: Can't drop user: '%s'@'%s'; Database privileges exists",
-		      user_name->user.str,
-		      user_name->host.str);
       result= -1;
       continue;
     }
@@ -3725,9 +3716,6 @@ int mysql_drop_user(THD *thd, List <LEX_USER> &list)
     }
     if (counter != column_priv_hash.records)
     {
-      sql_print_error("DROP USER: Can't drop user: '%s'@'%s';  Table privileges exists",
-		      user_name->user.str,
-		      user_name->host.str);
       result= -1;
       continue;
     }
@@ -3793,9 +3781,6 @@ int mysql_revoke_all(THD *thd,  List <LEX_USER> &list)
   {
     if (!check_acl_user(lex_user, &counter))
     {
-      sql_print_error("REVOKE ALL PRIVILEGES, GRANT: User '%s'@'%s' not exists",
-		      lex_user->user.str,
-		      lex_user->host.str);
       result= -1;
       continue;
     }