Added --skip-safemalloc to mysqltest

Added bug fix from 3.23 for AIX 4.3.3 and gcc 3.x
Small change in EXCHANGE output
Propagate open-files-limit from mysqld_safe -> mysqld
Fixed speed bug in GROUP BY
Added quotes around database name in CREATE DATABASE db_name (for binary log)


BitKeeper/etc/ignore:
  added stamp-h1
Docs/manual.texi:
  Added 4.1 manual section
  Updated changelog
client/mysqltest.c:
  Added --skip-safemalloc
include/my_global.h:
  Added bug fix from 3.23 for AIX 4.3.3 and gcc 3.x
mysql-test/mysql-test-run.sh:
  Start mysqltest with --skip-safemalloc (To get it faster)
mysql-test/r/bdb.result:
  Update for new EXPLAIN output
mysql-test/r/compare.result:
  Update for new EXPLAIN output
mysql-test/r/create.result:
  Update for new EXPLAIN output
mysql-test/r/distinct.result:
  Update for new EXPLAIN output
mysql-test/r/explain.result:
  Update for new EXPLAIN output
mysql-test/r/group_by.result:
  Update for new EXPLAIN output
mysql-test/r/heap.result:
  Update for new EXPLAIN output
mysql-test/r/innodb.result:
  Update for new EXPLAIN output
mysql-test/r/join_outer.result:
  Update for new EXPLAIN output
mysql-test/r/key_diff.result:
  Update for new EXPLAIN output
mysql-test/r/merge.result:
  Update for new EXPLAIN output
mysql-test/r/null_key.result:
  Update for new EXPLAIN output
mysql-test/r/order_by.result:
  Update for new EXPLAIN output
mysql-test/r/select.result:
  Update for new EXPLAIN output
mysql-test/r/temp_table.result:
  Fixed speed bug in GROUP BY
mysql-test/r/type_datetime.result:
  Update for new EXPLAIN output
mysql-test/r/user_var.result:
  Update for new EXPLAIN output
mysql-test/r/variables.result:
  Removed variable safe_show_database
mysql-test/t/temp_table.test:
  Fixed speed bug in GROUP BY
mysql-test/t/variables.test:
  Removed not used variable safe_show_databases
scripts/mysqld_safe.sh:
  Propagate open-files-limit from mysqld_safe -> mysqld
sql/mysqld.cc:
  Removed variable safe_show_database
sql/set_var.cc:
  Removed variable safe_show_database
sql/slave.cc:
  Updated error message
sql/sql_db.cc:
  Added quotes around database name in CREATE DATABASE db_name
sql/sql_select.cc:
  Fixed speed bug in GROUP BY

31 files changed, 284 insertions, 164 deletions

diff --git a/.bzrignore b/.bzrignore
index 6cfd4bcac5b..c0a91201e29 100644
--- a/.bzrignore
+++ b/.bzrignore
@@ -494,3 +494,5 @@ vio/test-ssl
 vio/test-sslclient
 vio/test-sslserver
 vio/viotest-ssl
+innobase/stamp-h1
+stamp-h1
diff --git a/Docs/manual.texi b/Docs/manual.texi
index 87933ddff06..33b8ca5524d 100644
--- a/Docs/manual.texi
+++ b/Docs/manual.texi
@@ -8202,6 +8202,10 @@ The following startup variables/options have been renamed:
 The startup options @code{record_buffer}, @code{sort_buffer} and
 @code{warnings} will still work in MySQL 4.0 but are deprecated.
 @item
+The mysqld option @code{--safe_show_database} doesn't work anymore.  One
+should instead give the @code{SHOW DATABASES} privileges to everyone that
+need to see all databases.
+@item
 The following SQL variables have changed name.
 @c arjen note: New table, not yet measured for O'Reilly/DocBook.
 @multitable @columnfractions .50 .50
@@ -19879,7 +19883,6 @@ differ somewhat:
 | query_cache_limit               | 1048576                      |
 | query_cache_size                | 0                            |
 | query_cache_type                | ON                           |
-| safe_show_database              | OFF                          |
 | server_id                       | 0                            |
 | slave_net_timeout               | 3600                         |
 | skip_external_locking           | ON                           |
@@ -20314,7 +20317,8 @@ This may be set (only numeric) to
 Don't show databases for which the user doesn't have any database or
 table privileges. This can improve security if you're concerned about
 people being able to see what databases other users have. See also
-@code{skip_show_database}.
+@code{skip_show_database}.  This option is deprecated as one should instead
+use the @code{SHOW DATABASES} privilege instead.
 
 @item @code{server_id}
 The value of the @code{--server-id} option.
@@ -20327,7 +20331,7 @@ Is ON if we only allow local (socket) connections.
 
 @item @code{skip_show_database}
 This prevents people from doing @code{SHOW DATABASES} if they don't have
-the @code{PROCESS} privilege. This can improve security if you're
+the @code{SHOW DATABASE} privilege. This can improve security if you're
 concerned about people being able to see what databases other users
 have. See also @code{safe_show_database}.
 
@@ -23683,7 +23687,7 @@ started}, your slaves may fail.
 
 Please see the following table for an indication of master-slave
 compatibility between different versions. With regard to version 4.0,
-we recommend using same version on both sides.
+we recommend using at least 4.0.4 on both sides.
 
 @c FIX arjen 2002-07-17 new table, not yet measured for XML/DocBook.
 @multitable @columnfractions .10 .15 .15 .10 .10 .10
@@ -24350,7 +24354,7 @@ may be used with @code{IO_THREAD} and @code{SQL_THREAD} options. (Slave)
  @tab Re-enables update logging if the user has the @code{SUPER} privilege.
  Ignored otherwise. (Master)
 
-@item @code{GLOBAL SET SQL_SLAVE_SKIP_COUNTER=n}
+@item @code{SET GLOBAL SQL_SLAVE_SKIP_COUNTER=n}
  @tab Skip the next @code{n} events from the master. Only valid when
 the slave thread is not running, otherwise, gives an error. Useful for
 recovering from replication glitches.
@@ -25510,7 +25514,7 @@ temporary table to hold the result.  This typically happens if you do an
 @code{ORDER BY} on a different column set than you did a @code{GROUP
 BY} on.
 
-@item Where used
+@item Using where (was @code{where used})
 A @code{WHERE} clause will be used to restrict which rows will be
 matched against the next table or sent to the client.  If you don't have
 this information and the table is of type @code{ALL} or @code{index},
@@ -25670,7 +25674,7 @@ Executing the @code{EXPLAIN} statement again produces this result:
 
 @example
 table type   possible_keys   key     key_len ref         rows    Extra
-tt    ALL    AssignedPC,ClientID,ActualPC NULL NULL NULL 3872    where used
+tt    ALL    AssignedPC,ClientID,ActualPC NULL NULL NULL 3872    Using where
 do    ALL    PRIMARY         NULL    NULL    NULL        2135
       range checked for each record (key map: 1)
 et_1  ALL    PRIMARY         NULL    NULL    NULL        74
@@ -25696,7 +25700,7 @@ Now @code{EXPLAIN} produces the output shown here:
 @example
 table type   possible_keys   key      key_len ref           rows Extra
 et    ALL    PRIMARY         NULL     NULL    NULL          74
-tt    ref    AssignedPC,     ActualPC 15      et.EMPLOYID   52   where used
+tt    ref    AssignedPC,     ActualPC 15      et.EMPLOYID   52   Using where
              ClientID,
              ActualPC
 et_1  eq_ref PRIMARY         PRIMARY  15      tt.AssignedPC 1
@@ -25719,7 +25723,7 @@ Now the join is perfect, and @code{EXPLAIN} produces this result:
 
 @example
 table type   possible_keys key     key_len ref           rows Extra
-tt    ALL    AssignedPC    NULL    NULL    NULL          3872 where used
+tt    ALL    AssignedPC    NULL    NULL    NULL          3872 Using where
              ClientID,
              ActualPC
 et    eq_ref PRIMARY       PRIMARY 15      tt.ActualPC   1
@@ -28868,7 +28872,6 @@ and if you can use @code{GLOBAL} or @code{SESSION} with them.
 @item read_buffer_size @tab num @tab GLOBAL | SESSION
 @item read_rnd_buffer_size @tab num @tab GLOBAL | SESSION
 @item rpl_recovery_rank @tab num @tab GLOBAL
-@item safe_show_database @tab bool @tab GLOBAL
 @item server_id @tab num @tab GLOBAL
 @item slave_compressed_protocol @tab bool @tab GLOBAL
 @item slave_net_timeout @tab num @tab GLOBAL
@@ -38698,8 +38701,8 @@ SUM_OVER_ALL_KEYS(max_length_of_key + sizeof(char*) * 2)
 * Table and index::             Table and Index Structures
 * File space management::       File Space Management and Disk I/O
 * Error handling::              Error Handling
-* InnoDB change history::       InnoDB Change History
 * InnoDB restrictions::         Restrictions on InnoDB Tables
+* InnoDB change history::       InnoDB Change History
 * InnoDB contact information::  InnoDB Contact Information.
 @end menu
 
@@ -50735,6 +50738,7 @@ this means that the version has not yet been released!
 @c Please don't add a new version here without also updating ../configure.in!
 
 @menu
+* News-4.1.x::                  
 * News-4.0.x::                  Changes in release 4.0.x (Beta)
 * News-3.23.x::                 Changes in release 3.23.x (Stable)
 * News-3.22.x::                 Changes in release 3.22.x (Older; Still supported)
@@ -50744,7 +50748,77 @@ this means that the version has not yet been released!
 @end menu
 
 
-@node News-4.0.x, News-3.23.x, News, News
+@node News-4.1.x, News-4.0.x, News, News
+@appendixsec Changes in release 4.1.x (Alpha)
+
+@cindex changes, version 4.1
+
+Version 4.1 of the MySQL server includes many enhancements and new features:
+
+@itemize @bullet
+@item
+Sub selects: @code{SELECT * from t1 where t1.a=(SELECT t2.b FROM t2)}.
+@item
+Character sets to be defined per column, table and database.
+@item
+Unicode (UTF8) support.
+@item
+Derived tables: @code{SELECT a from t1, (select * from t2) WHERE t1.a=t2.a}
+@item
+@code{BTREE} index on @code{HEAP} tables.
+@item
+Support for GIS (Geometrical data).
+@item
+@code{SHOW WARNINGS}; Shows warnings for the last command.
+@end itemize
+
+For a full list of changes, please refer to the changelog sections for
+each individual 4.1.x release.
+
+@menu
+* News-4.1.0::                  
+@end menu
+
+@node News-4.1.0,  , News-4.1.x, News-4.1.x
+@appendixsubsec Changes in release 4.1.0
+@itemize
+@item
+One can specify many temporary directories to be used in a round-robin
+fasion with:  @code{--tmpdir=dirname1:dirname2:dirname3}.
+@item
+Sub selects: @code{SELECT * from t1 where t1.a=(SELECT t2.b FROM t2)}.
+@item
+Character sets to be defined per column, table and database.
+@item
+Unicode (UTF8) support.
+@item
+Derived tables: @code{SELECT a from t1, (select * from t2) WHERE t1.a=t2.a}
+@item
+@code{BTREE} index on @code{HEAP} tables.
+@item
+Faster embedded server.
+@item
+One can add a comment per column in @code{CREATE TABLE}.
+@item
+@code{SHOW FULL COLUMNS FROM table_name} shows column comments.
+@item
+@code{ALTER DATABASE}.
+@item
+Support for GIS (Geometrical data).
+@item
+@code{SHOW WARNINGS}; Shows warnings from the last command.
+@item
+One can specify a column type for a colum in @code{CREATE TABLE
+... SELECT} by defining the column in the @code{CREATE} part
+
+@example
+CREATE TABLE foo (a tinyint not null) SELECT b+1 AS 'a' FROM bar;
+@end example
+
+@end itemize
+
+
+@node News-4.0.x, News-3.23.x, News-4.1.x, News
 @appendixsec Changes in release 4.0.x (Beta)
 
 @cindex changes, version 4.0
@@ -50815,6 +50889,17 @@ each individual 4.0.x release.
 @appendixsubsec Changes in release 4.0.5
 @itemize
 @item
+When one uses the @code{--open-files-limit=#} option to @code{mysqld_safe}
+it's now passed on to @code{mysqld}
+@item
+Fixed that @code{GROUP BY} on columns that may have a @code{NULL} value
+doesn't always use disk based temporary tables.
+@item
+Changed output from @code{EXPLAIN} from @code{'where used'} to
+@code{'Using where'} to make it more in line with other output.
+@item
+Removed variable @code{safe_show_database} as it was not used anymore.
+@item
 Small code improvement in multi-table updates
 @item
 Fixed a newly introduced bug that caused @code{ORDER BY ... LIMIT #}
@@ -51680,6 +51765,9 @@ not yet 100% confident in this code.
 @appendixsubsec Changes in release 3.23.54
 @itemize
 @item
+Allow one to start multiple MySQL servers on windows (code backported
+from 4.0.2).
+@item
 Fixed reference to freed memory when doing complicated @code{GROUP BY
 ... ORDER BY} queries.  Symptom was that @code{mysqld} died in function
 @code{send_fields}.
@@ -52504,8 +52592,9 @@ long as @code{server-id} is set and valid @file{master.info} is present.
 Partial updates (terminated with kill) are now logged with a special error
 code to the binary log. Slave will refuse to execute them if the error code
 indicates the update was terminated abnormally, and will have to be recovered
-with @code{SET SQL_SLAVE_SKIP_COUNTER=1; SLAVE START} after a manual sanity
-check/correction of data integrity.
+with @code{SET SQL_SLAVE_SKIP_COUNTER=1; SLAVE START} after a manual
+sanity check/correction of data integrity.  Update: In 4.0.3 and above
+you have to use @code{SET GLOBAL}.
 @item
 Fixed bug that erroneously logged a drop of internal temporary table
 on thread termination to the binary log -- this bug affected replication.
diff --git a/client/mysqltest.c b/client/mysqltest.c
index 533713b4f43..20d277ca969 100644
--- a/client/mysqltest.c
+++ b/client/mysqltest.c
@@ -91,7 +91,7 @@
 
 
 enum {OPT_MANAGER_USER=256,OPT_MANAGER_HOST,OPT_MANAGER_PASSWD,
-      OPT_MANAGER_PORT,OPT_MANAGER_WAIT_TIMEOUT};
+      OPT_MANAGER_PORT,OPT_MANAGER_WAIT_TIMEOUT, OPT_SKIP_SAFEMALLOC};
 
 static int record = 0, opt_sleep=0;
 static char *db = 0, *pass=0;
@@ -1845,6 +1845,9 @@ static struct my_option my_long_options[] =
    0, 0, 0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
   {"silent", 's', "Suppress all normal output. Synonym for --quiet.",
    (gptr*) &silent, (gptr*) &silent, 0, GET_BOOL, NO_ARG, 0, 0, 0, 0, 0, 0},
+  {"skip-safemalloc", OPT_SKIP_SAFEMALLOC,
+   "Don't use the memory allocation checking", 0, 0, 0, GET_NO_ARG, NO_ARG,
+   0, 0, 0, 0, 0, 0},
   {"sleep", 'T', "Sleep always this many seconds on sleep commands",
    (gptr*) &opt_sleep, (gptr*) &opt_sleep, 0, GET_INT, REQUIRED_ARG, 0, 0, 0,
    0, 0, 0},
@@ -1944,6 +1947,11 @@ get_one_option(int optid, const struct my_option *opt __attribute__((unused)),
     if (read_server_arguments(argument))
       die(NullS);
     break;
+  case OPT_SKIP_SAFEMALLOC:
+#ifdef SAFEMALLOC
+    sf_malloc_quick=1;
+#endif
+    break;
   case 'V':
     print_version();
     exit(0);
@@ -2301,6 +2309,7 @@ static void var_from_env(const char* name, const char* def_val)
 static void init_var_hash()
 {
   VAR* v;
+  DBUG_ENTER("init_var_hash");
   if (hash_init(&var_hash, 1024, 0, 0, get_var_key, var_free, MYF(0)))
     die("Variable hash initialization failed");
   var_from_env("MASTER_MYPORT", "9306");
@@ -2309,6 +2318,7 @@ static void init_var_hash()
   var_from_env("BIG_TEST", opt_big_test ? "1" : "0");
   v=var_init(0,"MAX_TABLES", 0, (sizeof(ulong) == 4) ? "31" : "63",0);
   hash_insert(&var_hash, (byte*)v);
+  DBUG_VOID_RETURN;
 }
 
 
diff --git a/include/my_global.h b/include/my_global.h
index d1b3c516555..8b899ff17ed 100644
--- a/include/my_global.h
+++ b/include/my_global.h
@@ -119,7 +119,16 @@
 #define _H_STRINGS
 #define _SYS_STREAM_H
 /* #define _AIX32_CURSES */	/* XXX: this breaks AIX 4.3.3 (others?). */
+#define ulonglong2double(A) my_ulonglong2double(A)
+#define my_off_t2double(A)  my_ulonglong2double(A)
+#ifdef	__cplusplus
+extern "C" {
 #endif
+double my_ulonglong2double(unsigned long long A);
+#ifdef	__cplusplus
+}
+#endif
+#endif /* _AIX */
 
 #ifdef HAVE_BROKEN_SNPRINTF	/* HPUX 10.20 don't have this defined */
 #undef HAVE_SNPRINTF
diff --git a/mysql-test/mysql-test-run.sh b/mysql-test/mysql-test-run.sh
index 8b5ec5191b0..09f8051a0f6 100644
--- a/mysql-test/mysql-test-run.sh
+++ b/mysql-test/mysql-test-run.sh
@@ -369,6 +369,7 @@ fi
 [ -d $MYSQL_TEST_DIR/var ] || mkdir $MYSQL_TEST_DIR/var
 [ -d $MYSQL_TEST_DIR/var/tmp ] || mkdir $MYSQL_TEST_DIR/var/tmp
 [ -d $MYSQL_TEST_DIR/var/run ] || mkdir $MYSQL_TEST_DIR/var/run
+[ -d $MYSQL_TEST_DIR/var/log ] || mkdir $MYSQL_TEST_DIR/var/log
 
 if test ${COLUMNS:-0} -lt 80 ; then COLUMNS=80 ; fi
 E=`$EXPR $COLUMNS - 8`
@@ -454,7 +455,7 @@ fi
 
 
 MYSQL_TEST_ARGS="--no-defaults --socket=$MASTER_MYSOCK --database=$DB \
- --user=$DBUSER --password=$DBPASSWD --silent -v \
+ --user=$DBUSER --password=$DBPASSWD --silent -v --skip-safemalloc \
  --tmpdir=$MYSQL_TMP_DIR"
 MYSQL_TEST_BIN=$MYSQL_TEST
 MYSQL_TEST="$MYSQL_TEST $MYSQL_TEST_ARGS"
diff --git a/mysql-test/r/bdb.result b/mysql-test/r/bdb.result
index 7374e936c36..e52878b9759 100644
--- a/mysql-test/r/bdb.result
+++ b/mysql-test/r/bdb.result
@@ -140,13 +140,13 @@ id	parent_id	level
 1010	102	2
 explain select level from t1 where level=1;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	level	level	1	const	1	where used; Using index
+t1	ref	level	level	1	const	1	Using where; Using index
 explain select level,id from t1 where level=1;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	level	level	1	const	1	where used; Using index
+t1	ref	level	level	1	const	1	Using where; Using index
 explain select level,id,parent_id from t1 where level=1;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	level	level	1	const	1	where used
+t1	ref	level	level	1	const	1	Using where
 select level,id from t1 where level=1;
 level	id
 1	1002
@@ -625,7 +625,7 @@ id	parent_id	level
 1016	102	2
 explain select level from t1 where level=1;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	level	level	1	const	1	where used; Using index
+t1	ref	level	level	1	const	1	Using where; Using index
 select level,id from t1 where level=1;
 level	id
 1	1004
diff --git a/mysql-test/r/compare.result b/mysql-test/r/compare.result
index 07f9ce4e81a..afd2a1a086b 100644
--- a/mysql-test/r/compare.result
+++ b/mysql-test/r/compare.result
@@ -3,7 +3,7 @@ CREATE TABLE t1 (id CHAR(12) not null, PRIMARY KEY (id));
 insert into t1 values ('000000000001'),('000000000002');
 explain select * from t1 where id=000000000001;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	index	PRIMARY	PRIMARY	12	NULL	2	where used; Using index
+t1	index	PRIMARY	PRIMARY	12	NULL	2	Using where; Using index
 select * from t1 where id=000000000001;
 id
 000000000001
diff --git a/mysql-test/r/create.result b/mysql-test/r/create.result
index 1e832a128e2..c3083dbfb03 100644
--- a/mysql-test/r/create.result
+++ b/mysql-test/r/create.result
@@ -63,7 +63,7 @@ insert into t1 (b) values ("hello"),("my"),("world");
 create table t2 (key (b)) select * from t1;
 explain select * from t2 where b="world";
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t2	ref	B	B	21	const	1	where used
+t2	ref	B	B	21	const	1	Using where
 select * from t2 where b="world";
 a	B
 3	world
diff --git a/mysql-test/r/distinct.result b/mysql-test/r/distinct.result
index c9b90094f77..10a00995c9e 100644
--- a/mysql-test/r/distinct.result
+++ b/mysql-test/r/distinct.result
@@ -175,7 +175,7 @@ explain SELECT distinct t3.a FROM t3,t2,t1 WHERE t3.a=t1.b AND t1.a=t2.a;
 table	type	possible_keys	key	key_len	ref	rows	Extra
 t3	index	a	a	5	NULL	6	Using index; Using temporary
 t2	index	a	a	4	NULL	5	Using index; Distinct
-t1	eq_ref	PRIMARY	PRIMARY	4	t2.a	1	where used; Distinct
+t1	eq_ref	PRIMARY	PRIMARY	4	t2.a	1	Using where; Distinct
 SELECT distinct t3.a FROM t3,t2,t1 WHERE t3.a=t1.b AND t1.a=t2.a;
 a
 1
@@ -190,7 +190,7 @@ insert into t3 select * from t4;
 explain select distinct t1.a from t1,t3 where t1.a=t3.a;
 table	type	possible_keys	key	key_len	ref	rows	Extra
 t1	index	PRIMARY	PRIMARY	4	NULL	2	Using index; Using temporary
-t3	ref	a	a	5	t1.a	10	where used; Using index; Distinct
+t3	ref	a	a	5	t1.a	10	Using where; Using index; Distinct
 select distinct t1.a from t1,t3 where t1.a=t3.a;
 a
 1
@@ -278,10 +278,10 @@ table	type	possible_keys	key	key_len	ref	rows	Extra
 t1	index	id	id	4	NULL	2	Using index; Using temporary
 t2	index	id	id	8	NULL	1	Using index; Distinct
 t3	index	id	id	8	NULL	1	Using index; Distinct
-j_lj_t2	index	id	id	4	NULL	2	where used; Using index; Distinct
-t2_lj	index	id	id	8	NULL	1	where used; Using index; Distinct
-j_lj_t3	index	id	id	4	NULL	2	where used; Using index; Distinct
-t3_lj	index	id	id	8	NULL	1	where used; Using index; Distinct
+j_lj_t2	index	id	id	4	NULL	2	Using where; Using index; Distinct
+t2_lj	index	id	id	8	NULL	1	Using where; Using index; Distinct
+j_lj_t3	index	id	id	4	NULL	2	Using where; Using index; Distinct
+t3_lj	index	id	id	8	NULL	1	Using where; Using index; Distinct
 SELECT DISTINCT
 t1.id
 from
diff --git a/mysql-test/r/explain.result b/mysql-test/r/explain.result
index 5b4da25d535..876846a5236 100644
--- a/mysql-test/r/explain.result
+++ b/mysql-test/r/explain.result
@@ -10,13 +10,13 @@ id	str
 3	foo
 explain select * from t1 where str is null;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	str	str	11	const	1	where used
+t1	ref	str	str	11	const	1	Using where
 explain select * from t1 where str="foo";
 table	type	possible_keys	key	key_len	ref	rows	Extra
 t1	const	str	str	11	const	1	
 explain select * from t1 ignore key (str) where str="foo";
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ALL	NULL	NULL	NULL	NULL	4	where used
+t1	ALL	NULL	NULL	NULL	NULL	4	Using where
 explain select * from t1 use key (str,str) where str="foo";
 table	type	possible_keys	key	key_len	ref	rows	Extra
 t1	const	str	str	11	const	1	
diff --git a/mysql-test/r/group_by.result b/mysql-test/r/group_by.result
index fd0248d5ee6..95a272e7b4a 100644
--- a/mysql-test/r/group_by.result
+++ b/mysql-test/r/group_by.result
@@ -234,10 +234,10 @@ userid	count(*)
 1	2
 explain select spid,count(*) from t1 where spid between 1 and 2 group by spid desc;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	range	spID	spID	5	NULL	2	where used; Using index
+t1	range	spID	spID	5	NULL	2	Using where; Using index
 explain select spid,count(*) from t1 where spid between 1 and 2 group by spid;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	range	spID	spID	5	NULL	2	where used; Using index
+t1	range	spID	spID	5	NULL	2	Using where; Using index
 select spid,count(*) from t1 where spid between 1 and 2 group by spid;
 spid	count(*)
 1	1
diff --git a/mysql-test/r/heap.result b/mysql-test/r/heap.result
index 13f452e26d8..73642d7f751 100644
--- a/mysql-test/r/heap.result
+++ b/mysql-test/r/heap.result
@@ -66,7 +66,7 @@ a
 alter table t1 type=myisam;
 explain select * from t1 where a in (869751,736494,226312,802616);
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	range	uniq_id	uniq_id	4	NULL	4	where used; Using index
+t1	range	uniq_id	uniq_id	4	NULL	4	Using where; Using index
 drop table t1;
 create table t1 (x int not null, y int not null, key x(x), unique y(y))
 type=heap;
@@ -159,17 +159,17 @@ create table t1 (btn char(10) not null, key(btn)) type=heap;
 insert into t1 values ("hello"),("hello"),("hello"),("hello"),("hello"),("a"),("b"),("c"),("d"),("e"),("f"),("g"),("h"),("i");
 explain select * from t1 where btn like "q%";
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ALL	btn	NULL	NULL	NULL	14	where used
+t1	ALL	btn	NULL	NULL	NULL	14	Using where
 select * from t1 where btn like "q%";
 btn
 alter table t1 add column new_col char(1) not null, add key (btn,new_col), drop key btn;
 update t1 set new_col=btn;
 explain select * from t1 where btn="a";
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ALL	btn	NULL	NULL	NULL	14	where used
+t1	ALL	btn	NULL	NULL	NULL	14	Using where
 explain select * from t1 where btn="a" and new_col="a";
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	btn	btn	11	const,const	10	where used
+t1	ref	btn	btn	11	const,const	10	Using where
 drop table t1;
 CREATE TABLE t1 (
 a int default NULL,
@@ -182,7 +182,7 @@ SELECT * FROM t1 WHERE a=NULL;
 a	b
 explain SELECT * FROM t1 WHERE a IS NULL;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	a	a	5	const	10	where used
+t1	ref	a	a	5	const	10	Using where
 SELECT * FROM t1 WHERE a<=>NULL;
 a	b
 NULL	99
@@ -190,7 +190,7 @@ SELECT * FROM t1 WHERE b=NULL;
 a	b
 explain SELECT * FROM t1 WHERE b IS NULL;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	b	b	5	const	1	where used
+t1	ref	b	b	5	const	1	Using where
 SELECT * FROM t1 WHERE b<=>NULL;
 a	b
 99	NULL
diff --git a/mysql-test/r/innodb.result b/mysql-test/r/innodb.result
index 78b0da2769e..ba2d1c392e3 100644
--- a/mysql-test/r/innodb.result
+++ b/mysql-test/r/innodb.result
@@ -140,13 +140,13 @@ id	parent_id	level
 1015	102	2
 explain select level from t1 where level=1;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	level	level	1	const	12	where used; Using index
+t1	ref	level	level	1	const	12	Using where; Using index
 explain select level,id from t1 where level=1;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	level	level	1	const	12	where used; Using index
+t1	ref	level	level	1	const	12	Using where; Using index
 explain select level,id,parent_id from t1 where level=1;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	level	level	1	const	12	where used
+t1	ref	level	level	1	const	12	Using where
 select level,id from t1 where level=1;
 level	id
 1	1002
@@ -597,7 +597,7 @@ id	parent_id	level
 1016	102	2
 explain select level from t1 where level=1;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	level	level	1	const	6	where used; Using index
+t1	ref	level	level	1	const	6	Using where; Using index
 select level,id from t1 where level=1;
 level	id
 1	1004
@@ -759,7 +759,7 @@ create table t1 (a int  primary key,b int, c int, d int, e int, f int, g int, h
 insert into t1 values (1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1);
 explain select * from t1 where a > 0 and a < 50;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	range	PRIMARY	PRIMARY	4	NULL	1	where used
+t1	range	PRIMARY	PRIMARY	4	NULL	1	Using where
 drop table t1;
 create table t1 (id int NOT NULL,id2 int NOT NULL,id3 int NOT NULL,dummy1 char(30),primary key (id,id2),index index_id3 (id3)) type=innodb;
 insert into t1 values (0,0,0,'ABCDEFGHIJ'),(2,2,2,'BCDEFGHIJK'),(1,1,1,'CDEFGHIJKL');
diff --git a/mysql-test/r/join_outer.result b/mysql-test/r/join_outer.result
index 9d3c152e516..37e18b8b304 100644
--- a/mysql-test/r/join_outer.result
+++ b/mysql-test/r/join_outer.result
@@ -95,7 +95,7 @@ Impossible WHERE noticed after reading const tables
 explain select t1.*,t2.* from t1 left join t2 on t1.a=t2.a where isnull(t2.a)=1;
 table	type	possible_keys	key	key_len	ref	rows	Extra
 t1	ALL	NULL	NULL	NULL	NULL	7	
-t2	eq_ref	PRIMARY	PRIMARY	8	t1.a	1	where used
+t2	eq_ref	PRIMARY	PRIMARY	8	t1.a	1	Using where
 select t1.*,t2.*,t3.a from t1 left join t2 on (t1.a=t2.a) left join t1 as t3 on (t2.a=t3.a);
 grp	a	c	id	a	c	d	a
 1	1	a	1	1	a	1	1
@@ -313,11 +313,11 @@ Lilliana Angelovska	NULL	NULL
 explain select t1.name, t2.name, t2.id from t1 left join t2 on (t1.id = t2.owner) where t2.id is null;
 table	type	possible_keys	key	key_len	ref	rows	Extra
 t1	ALL	NULL	NULL	NULL	NULL	3	
-t2	ALL	NULL	NULL	NULL	NULL	3	where used; Not exists
+t2	ALL	NULL	NULL	NULL	NULL	3	Using where; Not exists
 explain select t1.name, t2.name, t2.id from t1 left join t2 on (t1.id = t2.owner) where t2.name is null;
 table	type	possible_keys	key	key_len	ref	rows	Extra
 t1	ALL	NULL	NULL	NULL	NULL	3	
-t2	ALL	NULL	NULL	NULL	NULL	3	where used
+t2	ALL	NULL	NULL	NULL	NULL	3	Using where
 select count(*) from t1 left join t2 on (t1.id = t2.owner);
 count(*)
 4
@@ -333,11 +333,11 @@ Lilliana Angelovska	NULL	NULL
 explain select t1.name, t2.name, t2.id from t2 right join t1 on (t1.id = t2.owner) where t2.id is null;
 table	type	possible_keys	key	key_len	ref	rows	Extra
 t1	ALL	NULL	NULL	NULL	NULL	3	
-t2	ALL	NULL	NULL	NULL	NULL	3	where used; Not exists
+t2	ALL	NULL	NULL	NULL	NULL	3	Using where; Not exists
 explain select t1.name, t2.name, t2.id from t2 right join t1 on (t1.id = t2.owner) where t2.name is null;
 table	type	possible_keys	key	key_len	ref	rows	Extra
 t1	ALL	NULL	NULL	NULL	NULL	3	
-t2	ALL	NULL	NULL	NULL	NULL	3	where used
+t2	ALL	NULL	NULL	NULL	NULL	3	Using where
 select count(*) from t2 right join t1 on (t1.id = t2.owner);
 count(*)
 4
@@ -620,7 +620,7 @@ INSERT INTO t2 VALUES (1,1);
 explain SELECT * from t1 left join t2 on t1.id=t2.id where t2.id IS NULL;
 table	type	possible_keys	key	key_len	ref	rows	Extra
 t1	ALL	NULL	NULL	NULL	NULL	2	
-t2	index	id	id	8	NULL	1	where used; Using index; Not exists
+t2	index	id	id	8	NULL	1	Using where; Using index; Not exists
 SELECT * from t1 left join t2 on t1.id=t2.id where t2.id IS NULL;
 id	name	id	idx
 2	no	NULL	NULL
@@ -640,7 +640,7 @@ insert into t2 values (10,1),(20,2),(30,3);
 explain select * from t2 left join t1 on t1.fooID = t2.fooID and t1.fooID = 30;
 table	type	possible_keys	key	key_len	ref	rows	Extra
 t2	index	NULL	PRIMARY	4	NULL	3	Using index
-t1	eq_ref	PRIMARY	PRIMARY	2	const	1	where used; Using index
+t1	eq_ref	PRIMARY	PRIMARY	2	const	1	Using where; Using index
 select * from t2 left join t1 on t1.fooID = t2.fooID and t1.fooID = 30;
 fooID	barID	fooID
 10	1	NULL
diff --git a/mysql-test/r/key_diff.result b/mysql-test/r/key_diff.result
index 0886850f38a..4eaccc696f9 100644
--- a/mysql-test/r/key_diff.result
+++ b/mysql-test/r/key_diff.result
@@ -36,7 +36,7 @@ a	a	a	a
 explain select t1.*,t2.* from t1,t1 as t2 where t1.A=t2.B;
 table	type	possible_keys	key	key_len	ref	rows	Extra
 t1	ALL	a	NULL	NULL	NULL	5	
-t2	ALL	b	NULL	NULL	NULL	5	where used
+t2	ALL	b	NULL	NULL	NULL	5	Using where
 select t1.*,t2.* from t1,t1 as t2 where t1.A=t2.B order by binary t1.a,t2.a;
 a	b	a	b
 A	B	a	a
diff --git a/mysql-test/r/merge.result b/mysql-test/r/merge.result
index b95352a9eaa..3c4793a36c5 100644
--- a/mysql-test/r/merge.result
+++ b/mysql-test/r/merge.result
@@ -35,10 +35,10 @@ insert into t1 select NULL,message from t2;
 create table t3 (a int not null, b char(20), key(a)) type=MERGE UNION=(test.t1,test.t2);
 explain select * from t3 where a < 10;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t3	range	a	a	4	NULL	10	where used
+t3	range	a	a	4	NULL	10	Using where
 explain select * from t3 where a > 10 and a < 20;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t3	range	a	a	4	NULL	10	where used
+t3	range	a	a	4	NULL	10	Using where
 select * from t3 where a = 10;
 a	b
 10	Testing
diff --git a/mysql-test/r/null_key.result b/mysql-test/r/null_key.result
index bb8531a9fee..ce397e11c1a 100644
--- a/mysql-test/r/null_key.result
+++ b/mysql-test/r/null_key.result
@@ -3,37 +3,37 @@ create table t1 (a int, b int not null,unique key (a,b),index(b)) type=myisam;
 insert ignore into t1 values (1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(null,7),(9,9),(8,8),(7,7),(null,9),(null,9),(6,6);
 explain select * from t1 where a is null;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	a	a	5	const	3	where used; Using index
+t1	ref	a	a	5	const	3	Using where; Using index
 explain select * from t1 where a is null and b = 2;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	a,b	a	9	const,const	1	where used; Using index
+t1	ref	a,b	a	9	const,const	1	Using where; Using index
 explain select * from t1 where a is null and b = 7;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	a,b	a	9	const,const	1	where used; Using index
+t1	ref	a,b	a	9	const,const	1	Using where; Using index
 explain select * from t1 where a=2 and b = 2;
 table	type	possible_keys	key	key_len	ref	rows	Extra
 t1	const	a,b	a	9	const,const	1	
 explain select * from t1 where a<=>b limit 2;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	index	NULL	a	9	NULL	12	where used; Using index
+t1	index	NULL	a	9	NULL	12	Using where; Using index
 explain select * from t1 where (a is null or a > 0 and a < 3) and b < 5 limit 3;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	range	a,b	a	9	NULL	3	where used; Using index
+t1	range	a,b	a	9	NULL	3	Using where; Using index
 explain select * from t1 where (a is null or a = 7) and b=7;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	a,b	b	4	const	2	where used
+t1	ref	a,b	b	4	const	2	Using where
 explain select * from t1 where (a is null and b>a) or a is null and b=7 limit 2;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	a,b	a	5	const	3	where used; Using index
+t1	ref	a,b	a	5	const	3	Using where; Using index
 explain select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	range	a,b	a	9	NULL	2	where used; Using index
+t1	range	a,b	a	9	NULL	2	Using where; Using index
 explain select * from t1 where a > 1 and a < 3 limit 1;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	range	a	a	5	NULL	1	where used; Using index
+t1	range	a	a	5	NULL	1	Using where; Using index
 explain select * from t1 where a > 8 and a < 9;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	range	a	a	5	NULL	1	where used; Using index
+t1	range	a	a	5	NULL	1	Using where; Using index
 select * from t1 where a is null;
 a	b
 NULL	7
@@ -66,43 +66,43 @@ NULL	9
 alter table t1 modify b blob not null, add c int not null, drop key a, add unique key (a,b(20),c), drop key b, add key (b(10));
 explain select * from t1 where a is null and b = 2;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	a,b	a	5	const	3	where used
+t1	ref	a,b	a	5	const	3	Using where
 explain select * from t1 where a is null and b = 2 and c=0;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	a,b	a	5	const	3	where used
+t1	ref	a,b	a	5	const	3	Using where
 explain select * from t1 where a is null and b = 7 and c=0;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	a,b	a	5	const	3	where used
+t1	ref	a,b	a	5	const	3	Using where
 explain select * from t1 where a=2 and b = 2;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	a,b	a	5	const	1	where used
+t1	ref	a,b	a	5	const	1	Using where
 explain select * from t1 where a<=>b limit 2;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ALL	NULL	NULL	NULL	NULL	12	where used
+t1	ALL	NULL	NULL	NULL	NULL	12	Using where
 explain select * from t1 where (a is null or a > 0 and a < 3) and b < 5 and c=0 limit 3;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	range	a,b	a	5	NULL	5	where used
+t1	range	a,b	a	5	NULL	5	Using where
 explain select * from t1 where (a is null or a = 7) and b=7 and c=0;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	range	a,b	a	5	NULL	4	where used
+t1	range	a,b	a	5	NULL	4	Using where
 explain select * from t1 where (a is null and b>a) or a is null and b=7 limit 2;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	a,b	a	5	const	3	where used
+t1	ref	a,b	a	5	const	3	Using where
 explain select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	a,b	a	5	const	3	where used
+t1	ref	a,b	a	5	const	3	Using where
 explain select * from t1 where a > 1 and a < 3 limit 1;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	range	a	a	5	NULL	1	where used
+t1	range	a	a	5	NULL	1	Using where
 explain select * from t1 where a is null and b=7 or a > 1 and a < 3 limit 1;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	range	a,b	a	5	NULL	4	where used
+t1	range	a,b	a	5	NULL	4	Using where
 explain select * from t1 where a > 8 and a < 9;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	range	a	a	5	NULL	1	where used
+t1	range	a	a	5	NULL	1	Using where
 explain select * from t1 where b like "6%";
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	range	b	b	12	NULL	1	where used
+t1	range	b	b	12	NULL	1	Using where
 select * from t1 where a is null;
 a	b	c
 NULL	7	0
@@ -152,7 +152,7 @@ INSERT INTO t1 VALUES (1,NULL),(2,NULL),(3,1),(4,2),(5,NULL),(6,NULL),(7,3),(8,4
 INSERT INTO t2 VALUES (1,NULL),(2,NULL),(3,1),(4,2),(5,NULL),(6,NULL),(7,3),(8,4),(9,NULL),(10,NULL);
 explain select id from t1 where uniq_id is null;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	idx1	idx1	5	const	1	where used
+t1	ref	idx1	idx1	5	const	1	Using where
 explain select id from t1 where uniq_id =1;
 table	type	possible_keys	key	key_len	ref	rows	Extra
 t1	const	idx1	idx1	5	const	1	
diff --git a/mysql-test/r/order_by.result b/mysql-test/r/order_by.result
index 9ac88b42436..48773bfa916 100644
--- a/mysql-test/r/order_by.result
+++ b/mysql-test/r/order_by.result
@@ -264,13 +264,13 @@ create table t1 (a int not null, b int, c varchar(10), key (a, b, c));
 insert into t1 values (1, NULL, NULL), (1, NULL, 'b'), (1, 1, NULL), (1, 1, 'b'), (1, 1, 'b'), (2, 1, 'a'), (2, 1, 'b'), (2, 2, 'a'), (2, 2, 'b'), (2, 3, 'c'),(1,3,'b');
 explain select * from t1 where (a = 1 and b is null and c = 'b') or (a > 2) order by a desc;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	range	a	a	20	NULL	2	where used; Using index
+t1	range	a	a	20	NULL	2	Using where; Using index
 select * from t1 where (a = 1 and b is null and c = 'b') or (a > 2) order by a desc;
 a	b	c
 1	NULL	b
 explain select * from t1 where a >= 1 and a < 3 order by a desc;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	range	a	a	4	NULL	10	where used; Using index
+t1	range	a	a	4	NULL	10	Using where; Using index
 select * from t1 where a >= 1 and a < 3 order by a desc;
 a	b	c
 2	3	c
@@ -286,7 +286,7 @@ a	b	c
 1	NULL	NULL
 explain select * from t1 where a = 1 order by a desc, b desc;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	a	a	4	const	5	where used; Using index
+t1	ref	a	a	4	const	5	Using where; Using index
 select * from t1 where a = 1 order by a desc, b desc;
 a	b	c
 1	3	b
@@ -297,30 +297,30 @@ a	b	c
 1	NULL	NULL
 explain select * from t1 where a = 1 and b is null order by a desc, b desc;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	a	a	9	const,const	2	where used; Using index; Using filesort
+t1	ref	a	a	9	const,const	2	Using where; Using index; Using filesort
 select * from t1 where a = 1 and b is null order by a desc, b desc;
 a	b	c
 1	NULL	NULL
 1	NULL	b
 explain select * from t1 where a >= 1 and a < 3 and b >0 order by a desc,b desc;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	range	a	a	9	NULL	8	where used; Using index; Using filesort
+t1	range	a	a	9	NULL	8	Using where; Using index; Using filesort
 explain select * from t1 where a = 2 and b >0 order by a desc,b desc;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	range	a	a	9	NULL	5	where used; Using index
+t1	range	a	a	9	NULL	5	Using where; Using index
 explain select * from t1 where a = 2 and b is null order by a desc,b desc;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	a	a	9	const,const	1	where used; Using index; Using filesort
+t1	ref	a	a	9	const,const	1	Using where; Using index; Using filesort
 explain select * from t1 where a = 2 and (b is null or b > 0) order by a
 desc,b desc;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	range	a	a	9	NULL	6	where used; Using index
+t1	range	a	a	9	NULL	6	Using where; Using index
 explain select * from t1 where a = 2 and b > 0 order by a desc,b desc;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	range	a	a	9	NULL	5	where used; Using index
+t1	range	a	a	9	NULL	5	Using where; Using index
 explain select * from t1 where a = 2 and b < 2 order by a desc,b desc;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	range	a	a	9	NULL	2	where used; Using index; Using filesort
+t1	range	a	a	9	NULL	2	Using where; Using index; Using filesort
 alter table t1 modify b int not null, modify c varchar(10) not null;
 explain select * from t1 order by a, b, c;
 table	type	possible_keys	key	key_len	ref	rows	Extra
@@ -356,14 +356,14 @@ a	b	c
 1	0	
 explain select * from t1 where (a = 1 and b = 1 and c = 'b') or (a > 2) order by a desc;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	range	a	a	18	NULL	3	where used; Using index
+t1	range	a	a	18	NULL	3	Using where; Using index
 select * from t1 where (a = 1 and b = 1 and c = 'b') or (a > 2) order by a desc;
 a	b	c
 1	1	b
 1	1	b
 explain select * from t1 where a < 2 and b <= 1 order by a desc, b desc;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	range	a	a	4	NULL	6	where used; Using index
+t1	range	a	a	4	NULL	6	Using where; Using index
 select * from t1 where a < 2 and b <= 1 order by a desc, b desc;
 a	b	c
 1	1	b
@@ -387,7 +387,7 @@ a	b	c
 1	1	
 explain select * from t1 where a between 1 and 3 and b <= 1 order by a desc, b desc;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	range	a	a	8	NULL	10	where used; Using index
+t1	range	a	a	8	NULL	10	Using where; Using index
 select * from t1 where a between 1 and 3 and b <= 1 order by a desc, b desc;
 a	b	c
 2	1	b
@@ -399,7 +399,7 @@ a	b	c
 1	0	
 explain select * from t1 where a between 0 and 1 order by a desc, b desc;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	range	a	a	4	NULL	5	where used; Using index
+t1	range	a	a	4	NULL	5	Using where; Using index
 select * from t1 where a between 0 and 1 order by a desc, b desc;
 a	b	c
 1	3	b
@@ -452,24 +452,24 @@ EXPLAIN select t1.gid, t2.sid, t3.uid from t3, t2, t1 where t2.gid = t1.gid and
 table	type	possible_keys	key	key_len	ref	rows	Extra
 t1	index	PRIMARY	PRIMARY	4	NULL	6	Using index
 t2	eq_ref	PRIMARY,uid	PRIMARY	4	t1.gid	1	
-t3	eq_ref	PRIMARY	PRIMARY	2	t2.uid	1	where used; Using index
+t3	eq_ref	PRIMARY	PRIMARY	2	t2.uid	1	Using where; Using index
 EXPLAIN SELECT t1.gid, t3.uid from t1, t3 where t1.gid = t3.uid order by t1.gid,t3.skr;
 table	type	possible_keys	key	key_len	ref	rows	Extra
 t1	index	PRIMARY	PRIMARY	4	NULL	6	Using index
-t3	eq_ref	PRIMARY	PRIMARY	2	t1.gid	1	where used
+t3	eq_ref	PRIMARY	PRIMARY	2	t1.gid	1	Using where
 EXPLAIN SELECT t1.gid, t2.sid, t3.uid from t2, t1, t3 where t2.gid = t1.gid and t2.uid = t3.uid order by t3.uid, t1.gid;
 table	type	possible_keys	key	key_len	ref	rows	Extra
 t1	index	PRIMARY	PRIMARY	4	NULL	6	Using index; Using temporary; Using filesort
 t2	eq_ref	PRIMARY,uid	PRIMARY	4	t1.gid	1	
-t3	eq_ref	PRIMARY	PRIMARY	2	t2.uid	1	where used; Using index
+t3	eq_ref	PRIMARY	PRIMARY	2	t2.uid	1	Using where; Using index
 EXPLAIN SELECT t1.gid, t3.uid from t1, t3 where t1.gid = t3.uid order by t3.skr,t1.gid;
 table	type	possible_keys	key	key_len	ref	rows	Extra
 t1	index	PRIMARY	PRIMARY	4	NULL	6	Using index; Using temporary; Using filesort
-t3	eq_ref	PRIMARY	PRIMARY	2	t1.gid	1	where used
+t3	eq_ref	PRIMARY	PRIMARY	2	t1.gid	1	Using where
 EXPLAIN SELECT t1.gid, t3.uid from t1, t3 where t1.skr = t3.uid order by t1.gid,t3.skr;
 table	type	possible_keys	key	key_len	ref	rows	Extra
 t1	ALL	NULL	NULL	NULL	NULL	6	Using temporary; Using filesort
-t3	eq_ref	PRIMARY	PRIMARY	2	t1.skr	1	where used
+t3	eq_ref	PRIMARY	PRIMARY	2	t1.skr	1	Using where
 drop table t1,t2,t3;
 CREATE TABLE t1 (
 `titre` char(80) NOT NULL default '',
diff --git a/mysql-test/r/select.result b/mysql-test/r/select.result
index e0697f07cb8..1a40c5b11c3 100644
--- a/mysql-test/r/select.result
+++ b/mysql-test/r/select.result
@@ -1328,19 +1328,19 @@ select t2.fld3 from t2 where fld3 LIKE 'don_t_find_me_please%';
 fld3
 explain select t2.fld3 from t2 where fld3 = 'honeysuckle';
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t2	ref	fld3	fld3	30	const	1	where used; Using index
+t2	ref	fld3	fld3	30	const	1	Using where; Using index
 explain select fld3 from t2 ignore index (fld3) where fld3 = 'honeysuckle';
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t2	index	NULL	fld3	30	NULL	1199	where used; Using index
+t2	index	NULL	fld3	30	NULL	1199	Using where; Using index
 explain select fld3 from t2 use index (fld1) where fld3 = 'honeysuckle';
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t2	index	NULL	fld3	30	NULL	1199	where used; Using index
+t2	index	NULL	fld3	30	NULL	1199	Using where; Using index
 explain select fld3 from t2 use index (fld3) where fld3 = 'honeysuckle';
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t2	ref	fld3	fld3	30	const	1	where used; Using index
+t2	ref	fld3	fld3	30	const	1	Using where; Using index
 explain select fld3 from t2 use index (fld1,fld3) where fld3 = 'honeysuckle';
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t2	ref	fld3	fld3	30	const	1	where used; Using index
+t2	ref	fld3	fld3	30	const	1	Using where; Using index
 explain select fld3 from t2 ignore index (fld3,not_used);
 Key column 'not_used' doesn't exist in table
 explain select fld3 from t2 use index (not_used);
@@ -1351,7 +1351,7 @@ honeysuckle
 honoring
 explain select t2.fld3 from t2 where fld3 >= 'honeysuckle' and fld3 <= 'honoring' order by fld3;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t2	range	fld3	fld3	30	NULL	2	where used; Using index
+t2	range	fld3	fld3	30	NULL	2	Using where; Using index
 select fld1,fld3 from t2 where fld3="Colombo" or fld3 = "nondecreasing" order by fld3;
 fld1	fld3
 148504	Colombo
@@ -1371,7 +1371,7 @@ fld1
 250502
 explain select fld1 from t2 where fld1=250501 or fld1="250502";
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t2	range	fld1	fld1	4	NULL	2	where used; Using index
+t2	range	fld1	fld1	4	NULL	2	Using where; Using index
 select fld1 from t2 where fld1=250501 or fld1=250502 or fld1 >= 250505 and fld1 <= 250601 or fld1 between 250501 and 250502;
 fld1
 250501
@@ -1380,7 +1380,7 @@ fld1
 250601
 explain select fld1 from t2 where fld1=250501 or fld1=250502 or fld1 >= 250505 and fld1 <= 250601 or fld1 between 250501 and 250502;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t2	range	fld1	fld1	4	NULL	4	where used; Using index
+t2	range	fld1	fld1	4	NULL	4	Using where; Using index
 select fld1,fld3 from t2 where companynr = 37 and fld3 like 'f%';
 fld1	fld3
 218401	faithful
@@ -1807,8 +1807,8 @@ select distinct fld3 from t2,t3 where t2.companynr = 34 and t2.fld1=t3.t2nr orde
 fld3
 explain select t3.t2nr,fld3 from t2,t3 where t2.companynr = 34 and t2.fld1=t3.t2nr order by t3.t2nr,fld3;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t2	ALL	fld1	NULL	NULL	NULL	1199	where used; Using temporary; Using filesort
-t3	eq_ref	PRIMARY	PRIMARY	4	t2.fld1	1	where used; Using index
+t2	ALL	fld1	NULL	NULL	NULL	1199	Using where; Using temporary; Using filesort
+t3	eq_ref	PRIMARY	PRIMARY	4	t2.fld1	1	Using where; Using index
 explain select * from t3 as t1,t3 where t1.period=t3.period order by t3.period;
 table	type	possible_keys	key	key_len	ref	rows	Extra
 t1	ALL	period	NULL	NULL	NULL	41810	Using temporary; Using filesort
@@ -2575,11 +2575,11 @@ companynr	companyname
 explain select t2.companynr,companyname from t2 left join t4 using (companynr) where t4.companynr is null;
 table	type	possible_keys	key	key_len	ref	rows	Extra
 t2	ALL	NULL	NULL	NULL	NULL	1199	
-t4	eq_ref	PRIMARY	PRIMARY	1	test.t2.companynr	1	where used; Not exists
+t4	eq_ref	PRIMARY	PRIMARY	1	test.t2.companynr	1	Using where; Not exists
 explain select t2.companynr,companyname from t4 left join t2 using (companynr) where t2.companynr is null;
 table	type	possible_keys	key	key_len	ref	rows	Extra
 t4	ALL	NULL	NULL	NULL	NULL	12	
-t2	ALL	NULL	NULL	NULL	NULL	1199	where used; Not exists
+t2	ALL	NULL	NULL	NULL	NULL	1199	Using where; Not exists
 select distinct t2.companynr,t4.companynr from t2,t4 where t2.companynr=t4.companynr+1;
 companynr	companynr
 37	36
@@ -2587,7 +2587,7 @@ companynr	companynr
 explain select distinct t2.companynr,t4.companynr from t2,t4 where t2.companynr=t4.companynr+1;
 table	type	possible_keys	key	key_len	ref	rows	Extra
 t2	ALL	NULL	NULL	NULL	NULL	1199	Using temporary
-t4	index	NULL	PRIMARY	1	NULL	12	where used; Using index
+t4	index	NULL	PRIMARY	1	NULL	12	Using where; Using index
 select t2.fld1,t2.companynr,fld3,period from t3,t2 where t2.fld1 = 38208 and t2.fld1=t3.t2nr and period = 1008 or t2.fld1 = 38008 and t2.fld1 =t3.t2nr and period = 1008;
 fld1	companynr	fld3	period
 038008	37	reporters	1008
diff --git a/mysql-test/r/temp_table.result b/mysql-test/r/temp_table.result
index 84a00bfea34..45f879e182b 100644
--- a/mysql-test/r/temp_table.result
+++ b/mysql-test/r/temp_table.result
@@ -72,3 +72,25 @@ id	val	elt(two.val,'one','two')
 2	1	one
 4	2	two
 drop table t1,t2;
+drop table if exists t1;
+CREATE TABLE t1 (
+d datetime default NULL
+) TYPE=MyISAM;
+INSERT INTO t1 VALUES ('2002-10-24 14:50:32'),('2002-10-24 14:50:33'),('2002-10-24 14:50:34'),('2002-10-24 14:50:34'),('2002-10-24 14:50:34'),('2002-10-24 14:50:35'),('2002-10-24 14:50:35'),('2002-10-24 14:50:35'),('2002-10-24 14:50:35'),('2002-10-24 14:50:36'),('2002-10-24 14:50:36'),('2002-10-24 14:50:36'),('2002-10-24 14:50:36'),('2002-10-24 14:50:37'),('2002-10-24 14:50:37'),('2002-10-24 14:50:37'),('2002-10-24 14:50:37'),('2002-10-24 14:50:38'),('2002-10-24 14:50:38'),('2002-10-24 14:50:38'),('2002-10-24 14:50:39'),('2002-10-24 14:50:39'),('2002-10-24 14:50:39'),('2002-10-24 14:50:39'),('2002-10-24 14:50:40'),('2002-10-24 14:50:40'),('2002-10-24 14:50:40');
+flush status;
+select * from t1 group by d;
+d
+2002-10-24 14:50:32
+2002-10-24 14:50:33
+2002-10-24 14:50:34
+2002-10-24 14:50:35
+2002-10-24 14:50:36
+2002-10-24 14:50:37
+2002-10-24 14:50:38
+2002-10-24 14:50:39
+2002-10-24 14:50:40
+show status like "created_tmp%tables";
+Variable_name	Value
+Created_tmp_disk_tables	0
+Created_tmp_tables	1
+drop table t1;
diff --git a/mysql-test/r/type_datetime.result b/mysql-test/r/type_datetime.result
index cae15d4f665..38b264b96b9 100644
--- a/mysql-test/r/type_datetime.result
+++ b/mysql-test/r/type_datetime.result
@@ -76,5 +76,5 @@ date	numfacture	expedition
 0000-00-00 00:00:00	1212	0001-00-00 00:00:00
 EXPLAIN SELECT * FROM t1 WHERE expedition='0001-00-00 00:00:00';
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	expedition	expedition	8	const	1	where used
+t1	ref	expedition	expedition	8	const	1	Using where
 drop table t1;
diff --git a/mysql-test/r/user_var.result b/mysql-test/r/user_var.result
index 5643900182e..5e9f3a720c2 100644
--- a/mysql-test/r/user_var.result
+++ b/mysql-test/r/user_var.result
@@ -19,14 +19,14 @@ i	@vv1:=if(sv1.i,1,0)	@vv2:=if(sv2.i,1,0)	@vv3:=if(sv3.i,1,0)	@vv1+@vv2+@vv3
 2	1	0	0	1
 explain select * from t1 where i=@vv1;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	i	i	4	const	1	where used
+t1	ref	i	i	4	const	1	Using where
 explain select * from t1 where @vv1:=@vv1+1 and i=@vv1;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ALL	NULL	NULL	NULL	NULL	3	where used
+t1	ALL	NULL	NULL	NULL	NULL	3	Using where
 explain select @vv1:=i from t1 where i=@vv1;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	index	NULL	i	4	NULL	3	where used; Using index
+t1	index	NULL	i	4	NULL	3	Using where; Using index
 explain select * from t1 where i=@vv1;
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	ref	i	i	4	const	1	where used
+t1	ref	i	i	4	const	1	Using where
 drop table t1,t2;
diff --git a/mysql-test/r/variables.result b/mysql-test/r/variables.result
index f708ddd2ee7..ff0f94ab4a6 100644
--- a/mysql-test/r/variables.result
+++ b/mysql-test/r/variables.result
@@ -108,7 +108,6 @@ show global variables like 'table_type';
 Variable_name	Value
 table_type	INNODB
 set GLOBAL query_cache_size=100000;
-set GLOBAL safe_show_database=0;
 set myisam_max_sort_file_size=10000, GLOBAL myisam_max_sort_file_size=20000;
 show variables like 'myisam_max_sort_file_size';
 Variable_name	Value
@@ -276,7 +275,6 @@ set global query_cache_type=demand;
 set read_buffer_size=100;
 set read_rnd_buffer_size=100;
 set global rpl_recovery_rank=100;
-set global safe_show_database=1;
 set global server_id=100;
 set global slave_net_timeout=100;
 set global slow_launch_time=100;
diff --git a/mysql-test/t/temp_table.test b/mysql-test/t/temp_table.test
index 3cf18bae9fe..10168cf13c7 100644
--- a/mysql-test/t/temp_table.test
+++ b/mysql-test/t/temp_table.test
@@ -60,3 +60,21 @@ insert into t2 values (1,1),(2,1),(3,1),(4,2);
 # do a query using ELT, a join and an ORDER BY.
 select one.id, two.val, elt(two.val,'one','two') from t1 one, t2 two where two.id=one.id order by one.id;
 drop table t1,t2;
+
+#
+# In MySQL 4.0.4 doing a GROUP BY on a NULL column created a disk based
+# temporary table when a memory based one would be good enough.
+
+drop table if exists t1;
+
+CREATE TABLE t1 (
+  d datetime default NULL
+) TYPE=MyISAM;
+
+
+INSERT INTO t1 VALUES ('2002-10-24 14:50:32'),('2002-10-24 14:50:33'),('2002-10-24 14:50:34'),('2002-10-24 14:50:34'),('2002-10-24 14:50:34'),('2002-10-24 14:50:35'),('2002-10-24 14:50:35'),('2002-10-24 14:50:35'),('2002-10-24 14:50:35'),('2002-10-24 14:50:36'),('2002-10-24 14:50:36'),('2002-10-24 14:50:36'),('2002-10-24 14:50:36'),('2002-10-24 14:50:37'),('2002-10-24 14:50:37'),('2002-10-24 14:50:37'),('2002-10-24 14:50:37'),('2002-10-24 14:50:38'),('2002-10-24 14:50:38'),('2002-10-24 14:50:38'),('2002-10-24 14:50:39'),('2002-10-24 14:50:39'),('2002-10-24 14:50:39'),('2002-10-24 14:50:39'),('2002-10-24 14:50:40'),('2002-10-24 14:50:40'),('2002-10-24 14:50:40');
+
+flush status;
+select * from t1 group by d;
+show status like "created_tmp%tables";
+drop table t1;
diff --git a/mysql-test/t/variables.test b/mysql-test/t/variables.test
index 7a1d01c2cb5..e84a7fe404d 100644
--- a/mysql-test/t/variables.test
+++ b/mysql-test/t/variables.test
@@ -65,7 +65,6 @@ set table_type=MYISAM, table_type="HEAP", global table_type="INNODB";
 show local variables like 'table_type';
 show global variables like 'table_type';
 set GLOBAL query_cache_size=100000;
-set GLOBAL safe_show_database=0;
 
 set myisam_max_sort_file_size=10000, GLOBAL myisam_max_sort_file_size=20000;
 show variables like 'myisam_max_sort_file_size';
@@ -188,7 +187,6 @@ set global query_cache_type=demand;
 set read_buffer_size=100;
 set read_rnd_buffer_size=100;
 set global rpl_recovery_rank=100;
-set global safe_show_database=1;
 set global server_id=100;
 set global slave_net_timeout=100;
 set global slow_launch_time=100;
diff --git a/scripts/mysqld_safe.sh b/scripts/mysqld_safe.sh
index 9dea2eb3935..f51eff6585f 100644
--- a/scripts/mysqld_safe.sh
+++ b/scripts/mysqld_safe.sh
@@ -215,6 +215,7 @@ then
   if test -n "$open_files"
   then
     ulimit -n $open_files
+    args="open-files-limit=$open_files $args"
   fi
   if test -n "$core_file_size"
   then
diff --git a/sql/mysqld.cc b/sql/mysqld.cc
index f3aef7f1622..810a013a71d 100644
--- a/sql/mysqld.cc
+++ b/sql/mysqld.cc
@@ -274,7 +274,7 @@ static char* pidfile_name_ptr= pidfile_name;
 static pthread_t select_thread;
 static my_bool opt_noacl=0, opt_bootstrap=0, opt_myisam_log=0;
 my_bool opt_safe_user_create = 0, opt_no_mix_types = 0;
-my_bool opt_safe_show_db=0, lower_case_table_names, opt_old_rpl_compat;
+my_bool lower_case_table_names, opt_old_rpl_compat;
 my_bool opt_show_slave_auth_info, opt_sql_bin_update = 0;
 my_bool opt_log_slave_updates= 0;
 
@@ -3234,8 +3234,7 @@ struct my_option my_long_options[] =
 #ifndef TO_BE_DELETED
   {"safe-show-database", OPT_SAFE_SHOW_DB,
    "Deprecated option; One should use GRANT SHOW DATABASES instead...",
-   (gptr*) &opt_safe_show_db, (gptr*) &opt_safe_show_db, 0, GET_BOOL, NO_ARG,
-   0, 0, 0, 0, 0, 0},
+   0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0},
 #endif
   {"safe-user-create", OPT_SAFE_USER_CREATE,
    "Don't allow new user creation by the user who has no write privileges to the mysql.user table",
diff --git a/sql/set_var.cc b/sql/set_var.cc
index 5e90c1c1df7..80a0e0625cb 100644
--- a/sql/set_var.cc
+++ b/sql/set_var.cc
@@ -195,8 +195,6 @@ sys_var_thd_enum	sys_query_cache_type("query_cache_type",
 					     &SV::query_cache_type,
 					     &query_cache_type_typelib);
 #endif /* HAVE_QUERY_CACHE */
-sys_var_bool_ptr	sys_safe_show_db("safe_show_database",
-					 &opt_safe_show_db);
 sys_var_long_ptr	sys_server_id("server_id",&server_id);
 sys_var_bool_ptr	sys_slave_compressed_protocol("slave_compressed_protocol",
 						      &opt_slave_compressed_protocol);
@@ -356,7 +354,6 @@ sys_var *sys_variables[]=
   &sys_read_buff_size,
   &sys_read_rnd_buff_size,
   &sys_rpl_recovery_rank,
-  &sys_safe_show_db,
   &sys_safe_updates,
   &sys_select_limit,
   &sys_server_id,
@@ -499,7 +496,6 @@ struct show_var_st init_vars[]= {
   {sys_query_cache_size.name, (char*) &sys_query_cache_size,	    SHOW_SYS},
   {sys_query_cache_type.name, (char*) &sys_query_cache_type,        SHOW_SYS},
 #endif /* HAVE_QUERY_CACHE */
-  {sys_safe_show_db.name,     (char*) &sys_safe_show_db,            SHOW_SYS},
   {sys_server_id.name,	      (char*) &sys_server_id,		    SHOW_SYS},
   {sys_slave_net_timeout.name,(char*) &sys_slave_net_timeout,	    SHOW_SYS},
   {"skip_external_locking",   (char*) &my_disable_locking,          SHOW_MY_BOOL},
diff --git a/sql/slave.cc b/sql/slave.cc
index 824191078fc..dd310b44c20 100644
--- a/sql/slave.cc
+++ b/sql/slave.cc
@@ -1732,7 +1732,7 @@ int check_expected_error(THD* thd, RELAY_LOG_INFO* rli, int expected_error)
 		"Slave: query '%s' partially completed on the master \
 and was aborted. There is a chance that your master is inconsistent at this \
 point. If you are sure that your master is ok, run this query manually on the\
- slave and then restart the slave with SET SQL_SLAVE_SKIP_COUNTER=1;\
+ slave and then restart the slave with SET GLOBAL SQL_SLAVE_SKIP_COUNTER=1;\
  SLAVE START;", thd->query);
     rli->last_slave_errno = expected_error;
     sql_print_error("%s",rli->last_slave_error);
diff --git a/sql/sql_db.cc b/sql/sql_db.cc
index 287df717aec..be193ee0b55 100644
--- a/sql/sql_db.cc
+++ b/sql/sql_db.cc
@@ -77,9 +77,10 @@ int mysql_create_db(THD *thd, char *db, uint create_options, bool silent)
   {
     if (!thd->query)
     {
+      /* The client used the old obsolete mysql_create_db() call */
       thd->query = path;
-      thd->query_length = (uint) (strxmov(path,"create database ", db, NullS)-
-				  path);
+      thd->query_length = (uint) (strxmov(path,"create database `", db, "`",
+					  NullS) - path);
     }
     {
       mysql_update_log.write(thd,thd->query, thd->query_length);
diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index fc5fe33288f..e9569fb8ec4 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -3708,7 +3708,7 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
   *blob_field= 0;				// End marker
 
   /* If result table is small; use a heap */
-  if (blob_count || using_unique_constraint || group_null_items ||
+  if (blob_count || using_unique_constraint ||
       (select_options & (OPTION_BIG_TABLES | SELECT_SMALL_RESULT)) ==
       OPTION_BIG_TABLES)
   {
@@ -7193,56 +7193,32 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
       {
 	if (tab->use_quick == 2)
 	{
-	  sprintf(buff_ptr,"range checked for each record (index map: %u)",
+	  sprintf(buff_ptr,"; Range checked for each record (index map: %u)",
 		  tab->keys);
 	  buff_ptr=strend(buff_ptr);
 	}
 	else
-	  buff_ptr=strmov(buff_ptr,"where used");
+	  buff_ptr=strmov(buff_ptr,"; Using where");
       }
       if (key_read)
-      {
-	if (buff != buff_ptr)
-	{
-	  buff_ptr[0]=';' ; buff_ptr[1]=' '; buff_ptr+=2;
-	}
-	buff_ptr=strmov(buff_ptr,"Using index");
-      }
+	buff_ptr= strmov(buff_ptr,"; Using index");
       if (table->reginfo.not_exists_optimize)
-      {
-	if (buff != buff_ptr)
-	{
-	  buff_ptr[0]=';' ; buff_ptr[1]=' '; buff_ptr+=2;
-	}
-	buff_ptr=strmov(buff_ptr,"Not exists");
-      }
+	buff_ptr= strmov(buff_ptr,"; Not exists");
       if (need_tmp_table)
       {
 	need_tmp_table=0;
-	if (buff != buff_ptr)
-	{
-	  buff_ptr[0]=';' ; buff_ptr[1]=' '; buff_ptr+=2;
-	}
-	buff_ptr=strmov(buff_ptr,"Using temporary");
+	buff_ptr= strmov(buff_ptr,"; Using temporary");
       }
       if (need_order)
       {
 	need_order=0;
-	if (buff != buff_ptr)
-	{
-	  buff_ptr[0]=';' ; buff_ptr[1]=' '; buff_ptr+=2;
-	}
-	buff_ptr=strmov(buff_ptr,"Using filesort");
-      }
-      if (distinct & test_all_bits(used_tables,thd->used_tables))
-      {
-	if (buff != buff_ptr)
-	{
-	  buff_ptr[0]=';' ; buff_ptr[1]=' '; buff_ptr+=2;
-	}
-	buff_ptr=strmov(buff_ptr,"Distinct");
+	buff_ptr= strmov(buff_ptr,"; Using filesort");
       }
-      item_list.push_back(new Item_string(buff,(uint) (buff_ptr - buff)));
+      if (distinct && test_all_bits(used_tables,thd->used_tables))
+	buff_ptr= strmov(buff_ptr,"; Distinct");
+      if (buff_ptr == buff)
+	buff_ptr+= 2;
+      item_list.push_back(new Item_string(buff+2,(uint) (buff_ptr - buff)-2));
       // For next iteration
       used_tables|=table->map;
       if (result->send_data(item_list))