[SHOW] EXPLAIN UPDATE/DELETE, code re-structuring

- Merge with current 10.0-base

mysql-test/disabled.def

@@ -16,4 +16,4 @@ read_many_rows_innodb    : Bug#11748886 2010-11-15 mattiasj report already exist
 archive-big              : Bug#11817185 2011-03-10 Anitha Disabled since this leads to timeout on Solaris Sparc
 log_tables-big           : Bug#11756699 2010-11-15 mattiasj report already exists
 mysql_embedded           : Bug#12561297 2011-05-14 Anitha Dependent on PB2 changes - eventum#41836
-show_explain  : Psergey: random timeout in range-checked-for-each record query.
+#show_explain  : Psergey: random timeout in range-checked-for-each record query.

mysql-test/r/derived_opt.result

@@ -109,8 +109,8 @@ count(*)
 2
 explain select count(*) from t1 INNER JOIN (SELECT A.E1, A.E2, A.E3 FROM t1 AS A WHERE A.E3 = (SELECT MAX(B.E3) FROM t1 AS B WHERE A.E2 = B.E2)) AS THEMAX ON t1.E1 = THEMAX.E2 AND t1.E1 = t1.E2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	A	ALL	NULL	NULL	NULL	NULL	2	Using where
-1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.A.E2	1	Using where
+1	PRIMARY	A	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.A.E2	1	Using where
 3	DEPENDENT SUBQUERY	B	ALL	NULL	NULL	NULL	NULL	2	Using where
 drop table t1;
 create table t1 (a int);

mysql-test/r/derived_view.result

@@ -386,7 +386,7 @@ materialized derived in merged derived
 explain extended  select * from (select * from 
 (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) zz;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	<derived3>	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where
+1	PRIMARY	<derived3>	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where
 3	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where; Using temporary; Using filesort
 Warnings:
 Note	1003	select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where (`test`.`t1`.`f1` < 7) group by `test`.`t1`.`f1`) `tt` where (`tt`.`f1` > 2)
@@ -429,8 +429,8 @@ join
 (select * from (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) z
 on x.f1 = z.f1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	<derived3>	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where
-1	SIMPLE	<derived5>	ref	key0	key0	5	tt.f1	2	100.00	
+1	PRIMARY	<derived3>	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where
+1	PRIMARY	<derived5>	ref	key0	key0	5	tt.f1	2	100.00	
 5	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where; Using temporary; Using filesort
 3	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where; Using temporary; Using filesort
 Warnings:
@@ -522,7 +522,7 @@ materialized view in merged derived
 explain extended 
 select * from ( select * from v1 where f1 < 7) tt;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	<derived3>	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where
+1	PRIMARY	<derived3>	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where
 3	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using temporary; Using filesort
 Warnings:
 Note	1003	select `v1`.`f1` AS `f1`,`v1`.`f11` AS `f11` from `test`.`v1` where (`v1`.`f1` < 7)
@@ -568,8 +568,8 @@ f1	f11
 join of above two
 explain extended select * from v6 join v7 on f2=f1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where
-1	SIMPLE	<derived5>	ref	key0	key0	5	test.t2.f2	2	100.00	
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where
+1	PRIMARY	<derived5>	ref	key0	key0	5	test.t2.f2	2	100.00	
 5	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using temporary; Using filesort
 Warnings:
 Note	1003	select `test`.`t2`.`f2` AS `f2`,`test`.`t2`.`f22` AS `f22`,`v1`.`f1` AS `f1`,`v1`.`f11` AS `f11` from `test`.`t2` join `test`.`v1` where ((`v1`.`f1` = `test`.`t2`.`f2`) and (`test`.`t2`.`f2` < 7) and (`test`.`t2`.`f2` in (2,3)))
@@ -1220,7 +1220,7 @@ Note	1003	select `test`.`t1`.`b` AS `b` from `test`.`t1` where 0
 EXPLAIN EXTENDED
 SELECT * FROM (SELECT b FROM v2 WHERE b = 0) t WHERE b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
 3	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	5	100.00	Using temporary; Using filesort
 Warnings:
 Note	1003	select `v2`.`b` AS `b` from `test`.`v2` where 0

mysql-test/r/explain_non_select.result

@@ -0,0 +1,104 @@
+drop table if exists t0, t1;
+create table t0 (a int) engine=myisam;
+insert into t0 values (1),(2),(3),(4),(5),(6),(7),(8);
+#
+#  Tests for single-table DELETE
+# 
+explain select * from t0 where a=3;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	8	Using where
+explain delete from t0 where a=3;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	8	Using where
+# DELETE without WHERE is a special case:
+explain delete from t0;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Deleting all rows
+create table t1 (a int, b int, filler char(100), key(a), key(b));
+insert into t1 
+select A.a+10*B.a + 10*C.a, A.a+10*B.a + 10*C.a, 'filler' 
+from t0 A, t0 B, t0 C;
+# This should use an index,  possible_keys=NULL because there is no WHERE
+explain delete from t1 order by a limit 2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index	NULL	a	NULL	NULL	512	
+# This should use range, possible_keys={a,b}
+explain delete from t1 where a<20 and b < 10;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	range	a,b	a	5	NULL	1	Using where
+# This should use ALL + filesort
+explain delete from t1 order by a+1 limit 2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	512	Using filesort
+# This should use range + using filesort
+explain delete from t1 where a<20 order by b limit 2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	range	a	a	5	NULL	1	Using where; Using filesort
+# Try some subqueries:
+explain delete from t1 where a < (select max(a) from t0);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	range	a	a	5	NULL	1	Using where
+2	SUBQUERY	t0	ALL	NULL	NULL	NULL	NULL	8	
+explain delete from t1 where a < (select max(a) from t0 where a < t1.b);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	512	Using where
+2	DEPENDENT SUBQUERY	t0	ALL	NULL	NULL	NULL	NULL	8	Using where
+#
+#  Tests for multi-table DELETE
+# 
+explain delete t1 from t0, t1 where t0.a = t1.a;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	8	Using where
+1	SIMPLE	t1	ref	a	a	5	test.t0.a	4	Using index
+drop table t0, t1;
+# ###################################################################
+# ## EXPLAIN UPDATE tests
+# ###################################################################
+create table t0 (a int) engine=myisam;
+insert into t0 values (1),(2),(3),(4),(5),(6),(7),(8);
+explain update t0 set a=3 where a=4;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	8	Using where
+create table t1 (a int, b int, filler char(100), key(a), key(b));
+insert into t1 
+select A.a+10*B.a + 10*C.a, A.a+10*B.a + 10*C.a, 'filler' 
+from t0 A, t0 B, t0 C;
+explain update t1 set a=a+1 where 3>4;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible where
+explain update t1 set a=a+1 where a=3 and a=4;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible where
+# This should use an index,  possible_keys=NULL because there is no WHERE
+explain update t1 set a=a+1 order by a limit 2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	512	
+# This should use range, possible_keys={a,b}
+explain update t1 set filler='fooo' where a<20 and b < 10;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	range	a,b	a	5	NULL	1	Using where
+# This should use ALL + filesort
+explain update t1 set filler='fooo' order by a+1 limit 2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	512	
+# This should use range + using filesort
+explain update t1 set filler='fooo' where a<20 order by b limit 2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	range	a	a	5	NULL	1	Using where
+# Try some subqueries:
+explain update t1 set filler='fooo' where a < (select max(a) from t0);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	range	a	a	5	NULL	1	Using where
+2	SUBQUERY	t0	ALL	NULL	NULL	NULL	NULL	8	
+explain update t1 set filler='fooo' where a < (select max(a) from t0 where a < t1.b);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	512	Using where
+2	DEPENDENT SUBQUERY	t0	ALL	NULL	NULL	NULL	NULL	8	Using where
+#
+#  Tests for multi-table UPDATE
+# 
+explain update t0, t1 set t1.a=t1.a+1 where t0.a = t1.a;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	8	Using where
+1	SIMPLE	t1	ref	a	a	5	test.t0.a	4	Using index
+drop table t0, t1;

mysql-test/r/limit_rows_examined.result

@@ -439,7 +439,7 @@ from (select * from t1
 where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 0)) as tmp
 LIMIT ROWS EXAMINED 11;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	4	Using where
 3	MATERIALIZED	t2	ALL	NULL	NULL	NULL	NULL	4	Using where
 select *
 from (select * from t1

mysql-test/r/selectivity.result

@@ -393,7 +393,7 @@ and not exists (select * from orders where o_custkey = c_custkey)
 group by cntrycode
 order by cntrycode;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	customer	ALL	NULL	NULL	NULL	NULL	150	100.00	Using where; Using temporary; Using filesort
+1	PRIMARY	customer	ALL	NULL	NULL	NULL	NULL	150	100.00	Using where; Using temporary; Using filesort
 4	DEPENDENT SUBQUERY	orders	ref	i_o_custkey	i_o_custkey	5	dbt3_s001.customer.c_custkey	15	100.00	Using index
 3	SUBQUERY	customer	ALL	NULL	NULL	NULL	NULL	150	100.00	Using where
 Warnings:
@@ -434,7 +434,7 @@ and not exists (select * from orders where o_custkey = c_custkey)
 group by cntrycode
 order by cntrycode;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	customer	ALL	NULL	NULL	NULL	NULL	150	100.00	Using where; Using temporary; Using filesort
+1	PRIMARY	customer	ALL	NULL	NULL	NULL	NULL	150	100.00	Using where; Using temporary; Using filesort
 4	DEPENDENT SUBQUERY	orders	ref	i_o_custkey	i_o_custkey	5	dbt3_s001.customer.c_custkey	15	100.00	Using index
 3	SUBQUERY	customer	ALL	NULL	NULL	NULL	NULL	150	91.00	Using where
 Warnings:

mysql-test/r/selectivity_innodb.result

@@ -396,7 +396,7 @@ and not exists (select * from orders where o_custkey = c_custkey)
 group by cntrycode
 order by cntrycode;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	customer	ALL	NULL	NULL	NULL	NULL	150	100.00	Using where; Using temporary; Using filesort
+1	PRIMARY	customer	ALL	NULL	NULL	NULL	NULL	150	100.00	Using where; Using temporary; Using filesort
 4	DEPENDENT SUBQUERY	orders	ref	i_o_custkey	i_o_custkey	5	dbt3_s001.customer.c_custkey	15	100.00	Using index
 3	SUBQUERY	customer	ALL	NULL	NULL	NULL	NULL	150	100.00	Using where
 Warnings:
@@ -437,7 +437,7 @@ and not exists (select * from orders where o_custkey = c_custkey)
 group by cntrycode
 order by cntrycode;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	customer	ALL	NULL	NULL	NULL	NULL	150	100.00	Using where; Using temporary; Using filesort
+1	PRIMARY	customer	ALL	NULL	NULL	NULL	NULL	150	100.00	Using where; Using temporary; Using filesort
 4	DEPENDENT SUBQUERY	orders	ref	i_o_custkey	i_o_custkey	5	dbt3_s001.customer.c_custkey	15	100.00	Using index
 3	SUBQUERY	customer	ALL	NULL	NULL	NULL	NULL	150	91.00	Using where
 Warnings:

mysql-test/r/show_explain.result

@@ -165,7 +165,11 @@ set @show_explain_probe_select_id=1;
 set debug_dbug='+d,show_explain_probe_join_exec_end';
 select a, (select max(a) from t0 b where b.a+a.a<10) from t0 a where a<1;
 show explain for $thr2;
-ERROR HY000: Target is not running an EXPLAINable command
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	10	Using where
+2	DEPENDENT SUBQUERY	b	ALL	NULL	NULL	NULL	NULL	10	Using where
+Warnings:
+Note	1003	select a, (select max(a) from t0 b where b.a+a.a<10) from t0 a where a<1
 a	(select max(a) from t0 b where b.a+a.a<10)
 0	9
 set debug_dbug=@old_debug;
@@ -186,22 +190,38 @@ set @show_explain_probe_select_id=2;
 set debug_dbug='+d,show_explain_probe_join_exec_start';
 update t2 set dummy=0 where (select max(a) from t0 where t2.a + t0.a <3) >3 ;
 show explain for $thr2;
-ERROR HY000: Target is not running an EXPLAINable command
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	Using where
+2	DEPENDENT SUBQUERY	t0	ALL	NULL	NULL	NULL	NULL	10	Using where
+Warnings:
+Note	1003	update t2 set dummy=0 where (select max(a) from t0 where t2.a + t0.a <3) >3
 show explain for $thr2;
-ERROR HY000: Target is not running an EXPLAINable command
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	Using where
+2	DEPENDENT SUBQUERY	t0	ALL	NULL	NULL	NULL	NULL	10	Using where
+Warnings:
+Note	1003	update t2 set dummy=0 where (select max(a) from t0 where t2.a + t0.a <3) >3
 drop table t2;
 set debug_dbug=@old_debug;
 #
-# Attempt SHOW EXPLAIN for a DELETE
+# Attempt SHOW EXPLAIN for a DELETE (UPD: now works)
 # 
 create table t2 as select a as a, a as dummy from t0 limit 2;
 set @show_explain_probe_select_id=2;
 set debug_dbug='+d,show_explain_probe_join_exec_start';
 delete from t2 where (select max(a) from t0 where t2.a + t0.a <3) >3 ;
 show explain for $thr2;
-ERROR HY000: Target is not running an EXPLAINable command
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	Using where
+2	DEPENDENT SUBQUERY	t0	ALL	NULL	NULL	NULL	NULL	10	Using where
+Warnings:
+Note	1003	delete from t2 where (select max(a) from t0 where t2.a + t0.a <3) >3
 show explain for $thr2;
-ERROR HY000: Target is not running an EXPLAINable command
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	Using where
+2	DEPENDENT SUBQUERY	t0	ALL	NULL	NULL	NULL	NULL	10	Using where
+Warnings:
+Note	1003	delete from t2 where (select max(a) from t0 where t2.a + t0.a <3) >3
 drop table t2;
 set debug_dbug=@old_debug;
 #
@@ -220,13 +240,13 @@ Note	1003	select t2.a, ((select max(a) from t0 where t2.a + t0.a <3) >3) as SUBQ
 show explain for $thr2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	3	
-2	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Query plan already deleted
+2	DEPENDENT SUBQUERY	t0	ALL	NULL	NULL	NULL	NULL	10	Using where
 Warnings:
 Note	1003	select t2.a, ((select max(a) from t0 where t2.a + t0.a <3) >3) as SUBQ from t2
 show explain for $thr2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	3	
-2	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Query plan already deleted
+2	DEPENDENT SUBQUERY	t0	ALL	NULL	NULL	NULL	NULL	10	Using where
 Warnings:
 Note	1003	select t2.a, ((select max(a) from t0 where t2.a + t0.a <3) >3) as SUBQ from t2
 a	SUBQ
@@ -327,7 +347,11 @@ SELECT alias.a FROM t2, ( SELECT * FROM t2 ) AS alias GROUP BY alias.a;
 # FIXED by "conservative assumptions about when QEP is available" fix:
 #    NOTE: current code will not show "Using join buffer": 
 show explain for $thr2;
-ERROR HY000: Target is not running an EXPLAINable command
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	5	Using temporary; Using filesort
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	5	Using join buffer (flat, BNL join)
+Warnings:
+Note	1003	SELECT alias.a FROM t2, ( SELECT * FROM t2 ) AS alias GROUP BY alias.a
 a
 1
 2
@@ -412,7 +436,10 @@ set @show_explain_probe_select_id=1;
 set debug_dbug='+d,show_explain_probe_join_exec_end';
 select * from t0 where 1>10;
 show explain for $thr2;
-ERROR HY000: Target is not running an EXPLAINable command
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
+Warnings:
+Note	1003	select * from t0 where 1>10
 a
 set debug_dbug=@old_debug;
 #
@@ -424,7 +451,10 @@ set @show_explain_probe_select_id=1;
 set debug_dbug='+d,show_explain_probe_join_exec_end';
 select * from t0,t3 where t3.a=112233;
 show explain for $thr2;
-ERROR HY000: Target is not running an EXPLAINable command
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	no matching row in const table
+Warnings:
+Note	1003	select * from t0,t3 where t3.a=112233
 a	a
 set debug_dbug=@old_debug;
 drop table t3;
@@ -529,7 +559,12 @@ set @show_explain_probe_select_id=1;
 set debug_dbug='+d,show_explain_probe_join_exec_end';
 SELECT * FROM t2 WHERE (5, 78) IN (SELECT `a1`, MAX(`a1`) FROM t2 GROUP BY `a1`);
 show explain for $thr2;
-ERROR HY000: Target is not running an EXPLAINable command
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	<subquery2>	const	distinct_key	distinct_key	8	const,const	1	
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	20	Using join buffer (flat, BNL join)
+2	MATERIALIZED	t2	index	NULL	a1	4	NULL	20	Using index
+Warnings:
+Note	1003	SELECT * FROM t2 WHERE (5, 78) IN (SELECT `a1`, MAX(`a1`) FROM t2 GROUP BY `a1`)
 pk	a1
 set debug_dbug=@old_debug;
 DROP TABLE t2;
@@ -635,7 +670,7 @@ SELECT a + 1 FROM v1;
 show explain for $thr2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
-2	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Query plan already deleted
+2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	
 Warnings:
 Note	1003	SELECT a + 1 FROM v1
 a + 1
@@ -1045,7 +1080,7 @@ show explain for $thr2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	alias1	ALL	NULL	NULL	NULL	NULL	14	
 1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	20	
-3	SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Query plan already deleted
+3	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	20	Using where
 Warnings:
 Note	1003	SELECT max(a+b+c) FROM t1 AS alias1, ( SELECT * FROM t2 ) AS alias 
 WHERE EXISTS ( SELECT * FROM t3 WHERE b = c )  OR a <= 10

mysql-test/r/show_explain_non_select.result

@@ -0,0 +1,44 @@
+drop table if exists t0, t1;
+SET @old_debug= @@session.debug;
+set debug_sync='RESET';
+create table t0 (a int) engine=myisam;
+insert into t0 values (1),(2),(3),(4),(5),(6),(7),(8);
+create table t1 (a int, b int, filler char(100), key(a), key(b));
+insert into t1 
+select A.a+10*B.a + 10*C.a, A.a+10*B.a + 10*C.a, 'filler' 
+from t0 A, t0 B, t0 C;
+#
+# Test SHOW EXPLAIN for single-table DELETE
+#
+set debug_dbug='+d,show_explain_probe_delete_exec_start';
+delete from t1 where a<10 and b+1>1000;
+show explain for $thr2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	range	a	a	5	NULL	1	Using where
+Warnings:
+Note	1003	delete from t1 where a<10 and b+1>1000
+#
+# Test SHOW EXPLAIN for multi-table DELETE
+#
+set @show_explain_probe_select_id=1;
+set debug_dbug='+d,show_explain_probe_do_select';
+delete t1 from t1, t0 where t0.a=t1.a and t1.b +1 > 1000;
+show explain for $thr2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	8	Using where
+1	SIMPLE	t1	ref	a	a	5	test.t0.a	4	Using where
+Warnings:
+Note	1003	delete t1 from t1, t0 where t0.a=t1.a and t1.b +1 > 1000
+#
+# Test SHOW EXPLAIN for single-table UPDATE
+#
+set debug_dbug='+d,show_explain_probe_update_exec_start';
+update t1 set filler='filler-data-2' where a<10 and b+1>1000;
+show explain for $thr2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	range	a	a	5	NULL	1	Using where
+Warnings:
+Note	1003	update t1 set filler='filler-data-2' where a<10 and b+1>1000
+drop table t0,t1;
+set debug_dbug=@old_debug;
+set debug_sync='RESET';

mysql-test/r/subselect.result

@@ -10,7 +10,7 @@ select (select 2);
 2
 explain extended select (select 2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
 Note	1249	Select 2 was reduced during optimization
 Note	1003	select 2 AS `(select 2)`
@@ -734,7 +734,7 @@ id
 1
 EXPLAIN EXTENDED SELECT * FROM t2 WHERE id IN (SELECT 1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t2	ref	id	id	5	const	1	100.00	Using index
+1	SIMPLE	t2	ref	id	id	5	const	1	100.00	Using index
 Warnings:
 Note	1249	Select 2 was reduced during optimization
 Note	1003	select `test`.`t2`.`id` AS `id` from `test`.`t2` where (`test`.`t2`.`id` = 1)
@@ -746,7 +746,7 @@ id
 2
 EXPLAIN EXTENDED SELECT * FROM t2 WHERE id IN (SELECT 1+(select 1));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t2	ref	id	id	5	const	1	100.00	Using where; Using index
+1	SIMPLE	t2	ref	id	id	5	const	1	100.00	Using where; Using index
 Warnings:
 Note	1249	Select 3 was reduced during optimization
 Note	1249	Select 2 was reduced during optimization
@@ -880,7 +880,7 @@ select 10.5 > ANY (SELECT * from t1);
 1
 explain extended select (select a+1) from t1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
 Warnings:
 Note	1276	Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1
 Note	1249	Select 2 was reduced during optimization
@@ -4554,7 +4554,7 @@ int_nokey	int_key
 0	0
 EXPLAIN EXTENDED SELECT * FROM C WHERE `int_key` IN (SELECT `int_nokey`);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	C	ALL	NULL	NULL	NULL	NULL	20	100.00	Using where
+1	SIMPLE	C	ALL	NULL	NULL	NULL	NULL	20	100.00	Using where
 DROP TABLE C;
 # End of test for bug#45061.
 #
@@ -6112,7 +6112,7 @@ FROM t1 AS sq4_alias1
 WHERE (sq4_alias1.col_varchar_key + NULL) IS NULL OR
 sq4_alias1.col_varchar_key = @var3 ) AS alias3;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	<derived2>	system	NULL	NULL	NULL	NULL	0	const row not found
+1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	0	const row not found
 2	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	no matching row in const table
 SELECT * FROM ( SELECT @var3:=12, sq4_alias1.*
 FROM t1 AS sq4_alias1
@@ -6157,7 +6157,7 @@ FROM t2 AS c_sq1_alias1
 WHERE (c_sq1_alias1.col_int_nokey != @var2
 OR c_sq1_alias1.pk != @var3)) ) AS alias3;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
 3	DEPENDENT SUBQUERY	c_sq1_alias1	system	PRIMARY	NULL	NULL	NULL	1	
 SELECT * FROM ( SELECT sq4_alias1.*
 FROM t1 AS sq4_alias1

mysql-test/r/subselect2.result

@@ -258,7 +258,7 @@ WHERE date < '2012-12-12 12:12:12'
 ORDER BY mirror_date ASC
 ) AS calculated_result;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
 2	DERIVED	t1	range	date	date	9	NULL	2	Using index condition; Using where; Rowid-ordered scan; Using filesort
 SELECT * FROM (
 SELECT node_uid, date, mirror_date, @result := 0 AS result
@@ -281,7 +281,7 @@ WHERE date < '2012-12-12 12:12:12'
 ORDER BY mirror_date ASC
 ) AS calculated_result;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
 2	DERIVED	t1	range	date	date	9	NULL	2	Using index condition; Using where; Using filesort
 SELECT * FROM (
 SELECT node_uid, date, mirror_date, @result := 0 AS result

mysql-test/r/subselect3.result

@@ -1031,7 +1031,7 @@ update t22 set c = '2005-12-08 15:58:27' where a = 255;
 explain select t21.* from t21,t22 where t21.a = t22.a and 
 t22.a in (select t12.a from t11, t12 where t11.a in(255,256) and t11.a = t12.a and t11.c is null) and t22.c is null order by t21.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	t11	ALL	NULL	NULL	NULL	NULL	8	Using where; Using temporary; Using filesort; Start temporary
+1	PRIMARY	t11	ALL	NULL	NULL	NULL	NULL	8	Using where; Start temporary; Using temporary; Using filesort
 1	PRIMARY	t12	ALL	NULL	NULL	NULL	NULL	8	Using where; Using join buffer (flat, BNL join)
 1	PRIMARY	t22	ALL	NULL	NULL	NULL	NULL	26	Using where; End temporary; Using join buffer (flat, BNL join)
 1	PRIMARY	t21	ALL	NULL	NULL	NULL	NULL	26	Using where; Using join buffer (flat, BNL join)

mysql-test/r/subselect3_jcl6.result

@@ -1041,7 +1041,7 @@ update t22 set c = '2005-12-08 15:58:27' where a = 255;
 explain select t21.* from t21,t22 where t21.a = t22.a and 
 t22.a in (select t12.a from t11, t12 where t11.a in(255,256) and t11.a = t12.a and t11.c is null) and t22.c is null order by t21.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	t11	ALL	NULL	NULL	NULL	NULL	8	Using where; Using temporary; Using filesort; Start temporary
+1	PRIMARY	t11	ALL	NULL	NULL	NULL	NULL	8	Using where; Start temporary; Using temporary; Using filesort
 1	PRIMARY	t12	hash_ALL	NULL	#hash#$hj	4	test.t11.a	8	Using where; Using join buffer (flat, BNLH join)
 1	PRIMARY	t22	hash_ALL	NULL	#hash#$hj	4	test.t11.a	26	Using where; End temporary; Using join buffer (incremental, BNLH join)
 1	PRIMARY	t21	hash_ALL	NULL	#hash#$hj	4	test.t11.a	26	Using where; Using join buffer (incremental, BNLH join)

mysql-test/r/subselect4.result

@@ -93,12 +93,12 @@ DROP TABLE t1,t2;
 #
 EXPLAIN SELECT 1 LIKE ( 1 IN ( SELECT 1 ) );
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
 Note	1249	Select 2 was reduced during optimization
 DESCRIBE SELECT 1 LIKE ( 1 IN ( SELECT 1 ) );
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
 Note	1249	Select 2 was reduced during optimization
 # None of the below should crash
@@ -520,8 +520,8 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 2	MATERIALIZED	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
 EXECUTE stmt;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	t1_IDX	NULL	NULL	NULL	5	
-1	SIMPLE	<subquery2>	eq_ref	distinct_key	distinct_key	3	func	1	
+1	PRIMARY	t1	ALL	t1_IDX	NULL	NULL	NULL	5	
+1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	3	func	1	
 2	MATERIALIZED	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
 2	MATERIALIZED	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
 DEALLOCATE PREPARE stmt;
@@ -558,8 +558,8 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 2	MATERIALIZED	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
 EXECUTE stmt;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	t1_IDX	NULL	NULL	NULL	5	
-1	SIMPLE	<subquery2>	eq_ref	distinct_key	distinct_key	3	func	1	
+1	PRIMARY	t1	ALL	t1_IDX	NULL	NULL	NULL	5	
+1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	3	func	1	
 2	MATERIALIZED	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
 2	MATERIALIZED	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
 DEALLOCATE PREPARE stmt;
@@ -595,8 +595,8 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 2	MATERIALIZED	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
 EXECUTE stmt;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	
-1	SIMPLE	<subquery2>	eq_ref	distinct_key	distinct_key	3	func	1	
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	5	
+1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	3	func	1	
 2	MATERIALIZED	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
 2	MATERIALIZED	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
 DEALLOCATE PREPARE stmt;

mysql-test/r/subselect_exists_to_in.result

@@ -14,7 +14,7 @@ select (select 2);
 2
 explain extended select (select 2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
 Note	1249	Select 2 was reduced during optimization
 Note	1003	select 2 AS `(select 2)`
@@ -738,7 +738,7 @@ id
 1
 EXPLAIN EXTENDED SELECT * FROM t2 WHERE id IN (SELECT 1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t2	ref	id	id	5	const	1	100.00	Using index
+1	SIMPLE	t2	ref	id	id	5	const	1	100.00	Using index
 Warnings:
 Note	1249	Select 2 was reduced during optimization
 Note	1003	select `test`.`t2`.`id` AS `id` from `test`.`t2` where (`test`.`t2`.`id` = 1)
@@ -750,7 +750,7 @@ id
 2
 EXPLAIN EXTENDED SELECT * FROM t2 WHERE id IN (SELECT 1+(select 1));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t2	ref	id	id	5	const	1	100.00	Using where; Using index
+1	SIMPLE	t2	ref	id	id	5	const	1	100.00	Using where; Using index
 Warnings:
 Note	1249	Select 3 was reduced during optimization
 Note	1249	Select 2 was reduced during optimization
@@ -884,7 +884,7 @@ select 10.5 > ANY (SELECT * from t1);
 1
 explain extended select (select a+1) from t1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
 Warnings:
 Note	1276	Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1
 Note	1249	Select 2 was reduced during optimization
@@ -4560,7 +4560,7 @@ int_nokey	int_key
 0	0
 EXPLAIN EXTENDED SELECT * FROM C WHERE `int_key` IN (SELECT `int_nokey`);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	C	ALL	NULL	NULL	NULL	NULL	20	100.00	Using where
+1	SIMPLE	C	ALL	NULL	NULL	NULL	NULL	20	100.00	Using where
 DROP TABLE C;
 # End of test for bug#45061.
 #
@@ -6120,7 +6120,7 @@ FROM t1 AS sq4_alias1
 WHERE (sq4_alias1.col_varchar_key + NULL) IS NULL OR
 sq4_alias1.col_varchar_key = @var3 ) AS alias3;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	<derived2>	system	NULL	NULL	NULL	NULL	0	const row not found
+1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	0	const row not found
 2	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	no matching row in const table
 SELECT * FROM ( SELECT @var3:=12, sq4_alias1.*
 FROM t1 AS sq4_alias1
@@ -6165,7 +6165,7 @@ FROM t2 AS c_sq1_alias1
 WHERE (c_sq1_alias1.col_int_nokey != @var2
 OR c_sq1_alias1.pk != @var3)) ) AS alias3;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
 3	DEPENDENT SUBQUERY	c_sq1_alias1	system	PRIMARY	NULL	NULL	NULL	1	
 SELECT * FROM ( SELECT sq4_alias1.*
 FROM t1 AS sq4_alias1

mysql-test/r/subselect_no_mat.result

@@ -17,7 +17,7 @@ select (select 2);
 2
 explain extended select (select 2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
 Note	1249	Select 2 was reduced during optimization
 Note	1003	select 2 AS `(select 2)`
@@ -741,7 +741,7 @@ id
 1
 EXPLAIN EXTENDED SELECT * FROM t2 WHERE id IN (SELECT 1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t2	ref	id	id	5	const	1	100.00	Using index
+1	SIMPLE	t2	ref	id	id	5	const	1	100.00	Using index
 Warnings:
 Note	1249	Select 2 was reduced during optimization
 Note	1003	select `test`.`t2`.`id` AS `id` from `test`.`t2` where (`test`.`t2`.`id` = 1)
@@ -753,7 +753,7 @@ id
 2
 EXPLAIN EXTENDED SELECT * FROM t2 WHERE id IN (SELECT 1+(select 1));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t2	ref	id	id	5	const	1	100.00	Using where; Using index
+1	SIMPLE	t2	ref	id	id	5	const	1	100.00	Using where; Using index
 Warnings:
 Note	1249	Select 3 was reduced during optimization
 Note	1249	Select 2 was reduced during optimization
@@ -887,7 +887,7 @@ select 10.5 > ANY (SELECT * from t1);
 1
 explain extended select (select a+1) from t1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
 Warnings:
 Note	1276	Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1
 Note	1249	Select 2 was reduced during optimization
@@ -4556,7 +4556,7 @@ int_nokey	int_key
 0	0
 EXPLAIN EXTENDED SELECT * FROM C WHERE `int_key` IN (SELECT `int_nokey`);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	C	ALL	NULL	NULL	NULL	NULL	20	100.00	Using where
+1	SIMPLE	C	ALL	NULL	NULL	NULL	NULL	20	100.00	Using where
 DROP TABLE C;
 # End of test for bug#45061.
 #
@@ -6111,7 +6111,7 @@ FROM t1 AS sq4_alias1
 WHERE (sq4_alias1.col_varchar_key + NULL) IS NULL OR
 sq4_alias1.col_varchar_key = @var3 ) AS alias3;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	<derived2>	system	NULL	NULL	NULL	NULL	0	const row not found
+1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	0	const row not found
 2	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	no matching row in const table
 SELECT * FROM ( SELECT @var3:=12, sq4_alias1.*
 FROM t1 AS sq4_alias1
@@ -6156,7 +6156,7 @@ FROM t2 AS c_sq1_alias1
 WHERE (c_sq1_alias1.col_int_nokey != @var2
 OR c_sq1_alias1.pk != @var3)) ) AS alias3;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
 3	DEPENDENT SUBQUERY	c_sq1_alias1	system	PRIMARY	NULL	NULL	NULL	1	
 SELECT * FROM ( SELECT sq4_alias1.*
 FROM t1 AS sq4_alias1

mysql-test/r/subselect_no_opts.result

@@ -13,7 +13,7 @@ select (select 2);
 2
 explain extended select (select 2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
 Note	1249	Select 2 was reduced during optimization
 Note	1003	select 2 AS `(select 2)`
@@ -737,7 +737,7 @@ id
 1
 EXPLAIN EXTENDED SELECT * FROM t2 WHERE id IN (SELECT 1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t2	ref	id	id	5	const	1	100.00	Using index
+1	SIMPLE	t2	ref	id	id	5	const	1	100.00	Using index
 Warnings:
 Note	1249	Select 2 was reduced during optimization
 Note	1003	select `test`.`t2`.`id` AS `id` from `test`.`t2` where (`test`.`t2`.`id` = 1)
@@ -749,7 +749,7 @@ id
 2
 EXPLAIN EXTENDED SELECT * FROM t2 WHERE id IN (SELECT 1+(select 1));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t2	ref	id	id	5	const	1	100.00	Using where; Using index
+1	SIMPLE	t2	ref	id	id	5	const	1	100.00	Using where; Using index
 Warnings:
 Note	1249	Select 3 was reduced during optimization
 Note	1249	Select 2 was reduced during optimization
@@ -883,7 +883,7 @@ select 10.5 > ANY (SELECT * from t1);
 1
 explain extended select (select a+1) from t1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
 Warnings:
 Note	1276	Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1
 Note	1249	Select 2 was reduced during optimization
@@ -4552,7 +4552,7 @@ int_nokey	int_key
 0	0
 EXPLAIN EXTENDED SELECT * FROM C WHERE `int_key` IN (SELECT `int_nokey`);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	C	ALL	NULL	NULL	NULL	NULL	20	100.00	Using where
+1	SIMPLE	C	ALL	NULL	NULL	NULL	NULL	20	100.00	Using where
 DROP TABLE C;
 # End of test for bug#45061.
 #
@@ -6107,7 +6107,7 @@ FROM t1 AS sq4_alias1
 WHERE (sq4_alias1.col_varchar_key + NULL) IS NULL OR
 sq4_alias1.col_varchar_key = @var3 ) AS alias3;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	<derived2>	system	NULL	NULL	NULL	NULL	0	const row not found
+1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	0	const row not found
 2	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	no matching row in const table
 SELECT * FROM ( SELECT @var3:=12, sq4_alias1.*
 FROM t1 AS sq4_alias1
@@ -6152,7 +6152,7 @@ FROM t2 AS c_sq1_alias1
 WHERE (c_sq1_alias1.col_int_nokey != @var2
 OR c_sq1_alias1.pk != @var3)) ) AS alias3;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
 3	DEPENDENT SUBQUERY	c_sq1_alias1	system	PRIMARY	NULL	NULL	NULL	1	
 SELECT * FROM ( SELECT sq4_alias1.*
 FROM t1 AS sq4_alias1

mysql-test/r/subselect_no_scache.result

@@ -16,7 +16,7 @@ select (select 2);
 2
 explain extended select (select 2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
 Note	1249	Select 2 was reduced during optimization
 Note	1003	select 2 AS `(select 2)`
@@ -740,7 +740,7 @@ id
 1
 EXPLAIN EXTENDED SELECT * FROM t2 WHERE id IN (SELECT 1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t2	ref	id	id	5	const	1	100.00	Using index
+1	SIMPLE	t2	ref	id	id	5	const	1	100.00	Using index
 Warnings:
 Note	1249	Select 2 was reduced during optimization
 Note	1003	select `test`.`t2`.`id` AS `id` from `test`.`t2` where (`test`.`t2`.`id` = 1)
@@ -752,7 +752,7 @@ id
 2
 EXPLAIN EXTENDED SELECT * FROM t2 WHERE id IN (SELECT 1+(select 1));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t2	ref	id	id	5	const	1	100.00	Using where; Using index
+1	SIMPLE	t2	ref	id	id	5	const	1	100.00	Using where; Using index
 Warnings:
 Note	1249	Select 3 was reduced during optimization
 Note	1249	Select 2 was reduced during optimization
@@ -886,7 +886,7 @@ select 10.5 > ANY (SELECT * from t1);
 1
 explain extended select (select a+1) from t1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
 Warnings:
 Note	1276	Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1
 Note	1249	Select 2 was reduced during optimization
@@ -4560,7 +4560,7 @@ int_nokey	int_key
 0	0
 EXPLAIN EXTENDED SELECT * FROM C WHERE `int_key` IN (SELECT `int_nokey`);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	C	ALL	NULL	NULL	NULL	NULL	20	100.00	Using where
+1	SIMPLE	C	ALL	NULL	NULL	NULL	NULL	20	100.00	Using where
 DROP TABLE C;
 # End of test for bug#45061.
 #
@@ -6118,7 +6118,7 @@ FROM t1 AS sq4_alias1
 WHERE (sq4_alias1.col_varchar_key + NULL) IS NULL OR
 sq4_alias1.col_varchar_key = @var3 ) AS alias3;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	<derived2>	system	NULL	NULL	NULL	NULL	0	const row not found
+1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	0	const row not found
 2	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	no matching row in const table
 SELECT * FROM ( SELECT @var3:=12, sq4_alias1.*
 FROM t1 AS sq4_alias1
@@ -6163,7 +6163,7 @@ FROM t2 AS c_sq1_alias1
 WHERE (c_sq1_alias1.col_int_nokey != @var2
 OR c_sq1_alias1.pk != @var3)) ) AS alias3;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
 3	DEPENDENT SUBQUERY	c_sq1_alias1	system	PRIMARY	NULL	NULL	NULL	1	
 SELECT * FROM ( SELECT sq4_alias1.*
 FROM t1 AS sq4_alias1

mysql-test/r/subselect_no_semijoin.result

@@ -13,7 +13,7 @@ select (select 2);
 2
 explain extended select (select 2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
 Note	1249	Select 2 was reduced during optimization
 Note	1003	select 2 AS `(select 2)`
@@ -737,7 +737,7 @@ id
 1
 EXPLAIN EXTENDED SELECT * FROM t2 WHERE id IN (SELECT 1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t2	ref	id	id	5	const	1	100.00	Using index
+1	SIMPLE	t2	ref	id	id	5	const	1	100.00	Using index
 Warnings:
 Note	1249	Select 2 was reduced during optimization
 Note	1003	select `test`.`t2`.`id` AS `id` from `test`.`t2` where (`test`.`t2`.`id` = 1)
@@ -749,7 +749,7 @@ id
 2
 EXPLAIN EXTENDED SELECT * FROM t2 WHERE id IN (SELECT 1+(select 1));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t2	ref	id	id	5	const	1	100.00	Using where; Using index
+1	SIMPLE	t2	ref	id	id	5	const	1	100.00	Using where; Using index
 Warnings:
 Note	1249	Select 3 was reduced during optimization
 Note	1249	Select 2 was reduced during optimization
@@ -883,7 +883,7 @@ select 10.5 > ANY (SELECT * from t1);
 1
 explain extended select (select a+1) from t1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
 Warnings:
 Note	1276	Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1
 Note	1249	Select 2 was reduced during optimization
@@ -4552,7 +4552,7 @@ int_nokey	int_key
 0	0
 EXPLAIN EXTENDED SELECT * FROM C WHERE `int_key` IN (SELECT `int_nokey`);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	C	ALL	NULL	NULL	NULL	NULL	20	100.00	Using where
+1	SIMPLE	C	ALL	NULL	NULL	NULL	NULL	20	100.00	Using where
 DROP TABLE C;
 # End of test for bug#45061.
 #
@@ -6107,7 +6107,7 @@ FROM t1 AS sq4_alias1
 WHERE (sq4_alias1.col_varchar_key + NULL) IS NULL OR
 sq4_alias1.col_varchar_key = @var3 ) AS alias3;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	<derived2>	system	NULL	NULL	NULL	NULL	0	const row not found
+1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	0	const row not found
 2	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	no matching row in const table
 SELECT * FROM ( SELECT @var3:=12, sq4_alias1.*
 FROM t1 AS sq4_alias1
@@ -6152,7 +6152,7 @@ FROM t2 AS c_sq1_alias1
 WHERE (c_sq1_alias1.col_int_nokey != @var2
 OR c_sq1_alias1.pk != @var3)) ) AS alias3;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
 3	DEPENDENT SUBQUERY	c_sq1_alias1	system	PRIMARY	NULL	NULL	NULL	1	
 SELECT * FROM ( SELECT sq4_alias1.*
 FROM t1 AS sq4_alias1

mysql-test/r/subselect_sj.result

@@ -941,9 +941,9 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.t1field	1	Using index
 EXECUTE stmt;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	index	PRIMARY	PRIMARY	4	NULL	2	Using index
-1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.t1field	1	Using index
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.t1field	1	Using index
+1	PRIMARY	t1	index	PRIMARY	PRIMARY	4	NULL	2	Using index
+1	PRIMARY	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.t1field	1	Using index
+1	PRIMARY	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.t1field	1	Using index
 DROP TABLE t1, t2, t3;
 DROP VIEW v2, v3;
 # End of Bug#49198

mysql-test/r/subselect_sj_jcl6.result

@@ -954,9 +954,9 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.t1field	1	Using index
 EXECUTE stmt;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	index	PRIMARY	PRIMARY	4	NULL	2	Using index
-1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.t1field	1	Using index
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.t1field	1	Using index
+1	PRIMARY	t1	index	PRIMARY	PRIMARY	4	NULL	2	Using index
+1	PRIMARY	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.t1field	1	Using index
+1	PRIMARY	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.t1field	1	Using index
 DROP TABLE t1, t2, t3;
 DROP VIEW v2, v3;
 # End of Bug#49198

mysql-test/r/table_elim.result

@@ -119,27 +119,27 @@ t2 where id=f.id);
 This should use one table:
 explain select id from v1 where id=2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	f	const	PRIMARY	PRIMARY	4	const	1	Using index
+1	PRIMARY	f	const	PRIMARY	PRIMARY	4	const	1	Using index
 This should use one table:
 explain extended select id from v1 where id in (1,2,3,4);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	f	range	PRIMARY	PRIMARY	4	NULL	4	100.00	Using where; Using index
+1	PRIMARY	f	range	PRIMARY	PRIMARY	4	NULL	4	100.00	Using where; Using index
 Warnings:
 Note	1276	Field or reference 'test.a2.id' of SELECT #3 was resolved in SELECT #2
 Note	1003	select `f`.`id` AS `id` from `test`.`t0` `f` where (`f`.`id` in (1,2,3,4))
 This should use facts and a1 tables:
 explain extended select id from v1 where attr1 between 12 and 14;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	a1	range	PRIMARY,attr1	attr1	5	NULL	2	100.00	Using index condition
-1	SIMPLE	f	eq_ref	PRIMARY	PRIMARY	4	test.a1.id	1	100.00	Using index
+1	PRIMARY	a1	range	PRIMARY,attr1	attr1	5	NULL	2	100.00	Using index condition
+1	PRIMARY	f	eq_ref	PRIMARY	PRIMARY	4	test.a1.id	1	100.00	Using index
 Warnings:
 Note	1276	Field or reference 'test.a2.id' of SELECT #3 was resolved in SELECT #2
 Note	1003	select `f`.`id` AS `id` from `test`.`t0` `f` join `test`.`t1` `a1` where ((`f`.`id` = `a1`.`id`) and (`a1`.`attr1` between 12 and 14))
 This should use facts, a2 and its subquery:
 explain extended select id from v1 where attr2 between 12 and 14;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	a2	range	PRIMARY,attr2	attr2	5	NULL	5	100.00	Using index condition; Using where
-1	SIMPLE	f	eq_ref	PRIMARY	PRIMARY	4	test.a2.id	1	100.00	Using index
+1	PRIMARY	a2	range	PRIMARY,attr2	attr2	5	NULL	5	100.00	Using index condition; Using where
+1	PRIMARY	f	eq_ref	PRIMARY	PRIMARY	4	test.a2.id	1	100.00	Using index
 3	DEPENDENT SUBQUERY	t2	ref	PRIMARY	PRIMARY	4	test.a2.id	2	100.00	Using index
 Warnings:
 Note	1276	Field or reference 'test.a2.id' of SELECT #3 was resolved in SELECT #2
@@ -147,27 +147,27 @@ Note	1003	select `f`.`id` AS `id` from `test`.`t0` `f` join `test`.`t2` `a2` whe
 This should use one table:
 explain select id from v2 where id=2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	f	const	PRIMARY	PRIMARY	4	const	1	Using index
+1	PRIMARY	f	const	PRIMARY	PRIMARY	4	const	1	Using index
 This should use one table:
 explain extended select id from v2 where id in (1,2,3,4);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	f	range	PRIMARY	PRIMARY	4	NULL	4	100.00	Using where; Using index
+1	PRIMARY	f	range	PRIMARY	PRIMARY	4	NULL	4	100.00	Using where; Using index
 Warnings:
 Note	1276	Field or reference 'test.f.id' of SELECT #3 was resolved in SELECT #2
 Note	1003	select `f`.`id` AS `id` from `test`.`t0` `f` where (`f`.`id` in (1,2,3,4))
 This should use facts and a1 tables:
 explain extended select id from v2 where attr1 between 12 and 14;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	a1	range	PRIMARY,attr1	attr1	5	NULL	2	100.00	Using index condition
-1	SIMPLE	f	eq_ref	PRIMARY	PRIMARY	4	test.a1.id	1	100.00	Using index
+1	PRIMARY	a1	range	PRIMARY,attr1	attr1	5	NULL	2	100.00	Using index condition
+1	PRIMARY	f	eq_ref	PRIMARY	PRIMARY	4	test.a1.id	1	100.00	Using index
 Warnings:
 Note	1276	Field or reference 'test.f.id' of SELECT #3 was resolved in SELECT #2
 Note	1003	select `f`.`id` AS `id` from `test`.`t0` `f` join `test`.`t1` `a1` where ((`f`.`id` = `a1`.`id`) and (`a1`.`attr1` between 12 and 14))
 This should use facts, a2 and its subquery:
 explain extended select id from v2 where attr2 between 12 and 14;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	a2	range	PRIMARY,attr2	attr2	5	NULL	5	100.00	Using index condition
-1	SIMPLE	f	eq_ref	PRIMARY	PRIMARY	4	test.a2.id	1	100.00	Using where; Using index
+1	PRIMARY	a2	range	PRIMARY,attr2	attr2	5	NULL	5	100.00	Using index condition
+1	PRIMARY	f	eq_ref	PRIMARY	PRIMARY	4	test.a2.id	1	100.00	Using where; Using index
 3	DEPENDENT SUBQUERY	t2	ref	PRIMARY	PRIMARY	4	test.f.id	2	100.00	Using index
 Warnings:
 Note	1276	Field or reference 'test.f.id' of SELECT #3 was resolved in SELECT #2

mysql-test/r/view.result

@@ -119,7 +119,7 @@ c
 12
 explain extended select c from v5;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	<derived3>	ALL	NULL	NULL	NULL	NULL	5	100.00	
+1	PRIMARY	<derived3>	ALL	NULL	NULL	NULL	NULL	5	100.00	
 3	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	5	100.00	
 Warnings:
 Note	1003	select (`v2`.`c` + 1) AS `c` from `test`.`v2`
@@ -4475,8 +4475,8 @@ f1	f1
 1	1
 EXPLAIN EXTENDED SELECT * FROM v2 AS a1, v2 AS a2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	<derived3>	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
-1	SIMPLE	<derived5>	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer (flat, BNL join)
+1	PRIMARY	<derived3>	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
+1	PRIMARY	<derived5>	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer (flat, BNL join)
 5	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
 3	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
 Warnings:

mysql-test/t/explain_non_select.test

@@ -0,0 +1,86 @@
+#
+# MariaDB tests for EXPLAIN UPDATE/DELETE.
+#
+--disable_warnings
+drop table if exists t0, t1;
+--enable_warnings
+
+create table t0 (a int) engine=myisam;
+insert into t0 values (1),(2),(3),(4),(5),(6),(7),(8);
+
+--echo #
+--echo #  Tests for single-table DELETE
+--echo # 
+
+explain select * from t0 where a=3;
+explain delete from t0 where a=3;
+
+--echo # DELETE without WHERE is a special case:
+explain delete from t0;
+
+create table t1 (a int, b int, filler char(100), key(a), key(b));
+insert into t1 
+select A.a+10*B.a + 10*C.a, A.a+10*B.a + 10*C.a, 'filler' 
+from t0 A, t0 B, t0 C;
+
+--echo # This should use an index,  possible_keys=NULL because there is no WHERE
+explain delete from t1 order by a limit 2;
+
+--echo # This should use range, possible_keys={a,b}
+explain delete from t1 where a<20 and b < 10;
+
+--echo # This should use ALL + filesort
+explain delete from t1 order by a+1 limit 2;
+
+--echo # This should use range + using filesort
+explain delete from t1 where a<20 order by b limit 2;
+
+--echo # Try some subqueries:
+explain delete from t1 where a < (select max(a) from t0);
+explain delete from t1 where a < (select max(a) from t0 where a < t1.b);
+
+--echo #
+--echo #  Tests for multi-table DELETE
+--echo # 
+explain delete t1 from t0, t1 where t0.a = t1.a;
+drop table t0, t1;
+
+--echo # ###################################################################
+--echo # ## EXPLAIN UPDATE tests
+--echo # ###################################################################
+create table t0 (a int) engine=myisam;
+insert into t0 values (1),(2),(3),(4),(5),(6),(7),(8);
+
+explain update t0 set a=3 where a=4;
+
+create table t1 (a int, b int, filler char(100), key(a), key(b));
+insert into t1 
+select A.a+10*B.a + 10*C.a, A.a+10*B.a + 10*C.a, 'filler' 
+from t0 A, t0 B, t0 C;
+
+explain update t1 set a=a+1 where 3>4;
+explain update t1 set a=a+1 where a=3 and a=4;
+
+--echo # This should use an index,  possible_keys=NULL because there is no WHERE
+explain update t1 set a=a+1 order by a limit 2;
+
+--echo # This should use range, possible_keys={a,b}
+explain update t1 set filler='fooo' where a<20 and b < 10;
+
+--echo # This should use ALL + filesort
+explain update t1 set filler='fooo' order by a+1 limit 2;
+
+--echo # This should use range + using filesort
+explain update t1 set filler='fooo' where a<20 order by b limit 2;
+
+--echo # Try some subqueries:
+explain update t1 set filler='fooo' where a < (select max(a) from t0);
+explain update t1 set filler='fooo' where a < (select max(a) from t0 where a < t1.b);
+
+--echo #
+--echo #  Tests for multi-table UPDATE
+--echo # 
+explain update t0, t1 set t1.a=t1.a+1 where t0.a = t1.a;
+
+
+drop table t0, t1;

mysql-test/t/show_explain.test

@@ -202,7 +202,6 @@ set debug_dbug='+d,show_explain_probe_join_exec_end';
 send select a, (select max(a) from t0 b where b.a+a.a<10) from t0 a where a<1;
 connection default;
 --source include/wait_condition.inc
---error ER_TARGET_NOT_EXPLAINABLE
 evalp show explain for $thr2;
 connection con1;
 reap;
@@ -238,10 +237,10 @@ set debug_dbug='+d,show_explain_probe_join_exec_start';
 send update t2 set dummy=0 where (select max(a) from t0 where t2.a + t0.a <3) >3 ;
 connection default;
 --source include/wait_condition.inc
---error ER_TARGET_NOT_EXPLAINABLE
+#--error ER_TARGET_NOT_EXPLAINABLE
 evalp show explain for $thr2;
 --source include/wait_condition.inc
---error ER_TARGET_NOT_EXPLAINABLE
+#--error ER_TARGET_NOT_EXPLAINABLE
 evalp show explain for $thr2;
 connection con1;
 reap;
@@ -249,7 +248,7 @@ drop table t2;
 set debug_dbug=@old_debug;
 
 --echo #
---echo # Attempt SHOW EXPLAIN for a DELETE
+--echo # Attempt SHOW EXPLAIN for a DELETE (UPD: now works)
 --echo # 
 create table t2 as select a as a, a as dummy from t0 limit 2;
 set @show_explain_probe_select_id=2;
@@ -257,10 +256,10 @@ set debug_dbug='+d,show_explain_probe_join_exec_start';
 send delete from t2 where (select max(a) from t0 where t2.a + t0.a <3) >3 ;
 connection default;
 --source include/wait_condition.inc
---error ER_TARGET_NOT_EXPLAINABLE
+#--error ER_TARGET_NOT_EXPLAINABLE
 evalp show explain for $thr2;
 --source include/wait_condition.inc
---error ER_TARGET_NOT_EXPLAINABLE
+#--error ER_TARGET_NOT_EXPLAINABLE
 evalp show explain for $thr2;
 connection con1;
 reap;
@@ -349,7 +348,7 @@ connection default;
 --source include/wait_condition.inc
 --echo # FIXED by "conservative assumptions about when QEP is available" fix:
 --echo #    NOTE: current code will not show "Using join buffer": 
---error ER_TARGET_NOT_EXPLAINABLE
+#--error ER_TARGET_NOT_EXPLAINABLE
 evalp show explain for $thr2;
 connection con1;
 reap;
@@ -428,7 +427,7 @@ set debug_dbug='+d,show_explain_probe_join_exec_end';
 send select * from t0 where 1>10;
 connection default;
 --source include/wait_condition.inc
---error ER_TARGET_NOT_EXPLAINABLE
+#--error ER_TARGET_NOT_EXPLAINABLE
 evalp show explain for $thr2;
 connection con1;
 reap;
@@ -444,7 +443,7 @@ set debug_dbug='+d,show_explain_probe_join_exec_end';
 send select * from t0,t3 where t3.a=112233;
 connection default;
 --source include/wait_condition.inc
---error ER_TARGET_NOT_EXPLAINABLE
+# --error ER_TARGET_NOT_EXPLAINABLE
 evalp show explain for $thr2;
 connection con1;
 reap;
@@ -540,7 +539,7 @@ send
   SELECT * FROM t2 WHERE (5, 78) IN (SELECT `a1`, MAX(`a1`) FROM t2 GROUP BY `a1`);
 connection default;
 --source include/wait_condition.inc
---error ER_TARGET_NOT_EXPLAINABLE
+# --error ER_TARGET_NOT_EXPLAINABLE
 evalp show explain for $thr2;
 connection con1;
 reap;

mysql-test/t/show_explain_non_select.test

@@ -0,0 +1,78 @@
+#
+# SHOW EXPLAIN tests for non-select subqueries
+#
+#--source include/have_debug.inc
+#--source include/have_innodb.inc
+#--source include/not_embedded.inc
+
+--disable_warnings
+drop table if exists t0, t1;
+--enable_warnings
+
+SET @old_debug= @@session.debug;
+set debug_sync='RESET';
+
+# 
+# Setup two threads and their ids
+#
+let $thr1=`select connection_id()`;
+connect (con2, localhost, root,,);
+connection con2;
+let $thr2=`select connection_id()`;
+connection default;
+
+# 
+# Create tables
+# 
+create table t0 (a int) engine=myisam;
+insert into t0 values (1),(2),(3),(4),(5),(6),(7),(8);
+
+create table t1 (a int, b int, filler char(100), key(a), key(b));
+insert into t1 
+select A.a+10*B.a + 10*C.a, A.a+10*B.a + 10*C.a, 'filler' 
+from t0 A, t0 B, t0 C;
+
+let $wait_condition= select State='show_explain_trap' from information_schema.processlist where id=$thr2;
+
+--echo #
+--echo # Test SHOW EXPLAIN for single-table DELETE
+--echo #
+connection con2;
+set debug_dbug='+d,show_explain_probe_delete_exec_start';
+send delete from t1 where a<10 and b+1>1000;
+
+connection default;
+--source include/wait_condition.inc
+evalp show explain for $thr2;
+connection con2;
+reap;
+
+--echo #
+--echo # Test SHOW EXPLAIN for multi-table DELETE
+--echo #
+set @show_explain_probe_select_id=1;
+set debug_dbug='+d,show_explain_probe_do_select';
+send delete t1 from t1, t0 where t0.a=t1.a and t1.b +1 > 1000;
+connection default;
+--source include/wait_condition.inc
+evalp show explain for $thr2;
+connection con2;
+reap;
+
+--echo #
+--echo # Test SHOW EXPLAIN for single-table UPDATE
+--echo #
+connection con2;
+set debug_dbug='+d,show_explain_probe_update_exec_start';
+send update t1 set filler='filler-data-2' where a<10 and b+1>1000;
+
+connection default;
+--source include/wait_condition.inc
+evalp show explain for $thr2;
+connection con2;
+reap;
+
+drop table t0,t1;
+
+set debug_dbug=@old_debug;
+set debug_sync='RESET';