merge

mysql-test/r/partition.result

 drop table if exists t1, t2;
+#
+# Bug#55458: Partitioned MyISAM table gets crashed by multi-table update 
+#
+CREATE TABLE t1 (
+`id` int NOT NULL,
+`user_num` int DEFAULT NULL,
+PRIMARY KEY (`id`)
+) ENGINE=MyISAM CHARSET=latin1;
+INSERT INTO t1 VALUES (1,8601);
+INSERT INTO t1 VALUES (2,8601);
+INSERT INTO t1 VALUES (3,8601);
+INSERT INTO t1 VALUES (4,8601);
+CREATE TABLE t2 (
+`id` int(11) NOT NULL,
+`user_num` int DEFAULT NULL,
+`name` varchar(64) NOT NULL,
+PRIMARY KEY (`id`)
+) ENGINE=MyISAM CHARSET=latin1
+PARTITION BY HASH (id)
+PARTITIONS 2;
+INSERT INTO t2 VALUES (1,8601,'John');
+INSERT INTO t2 VALUES (2,8601,'JS');
+INSERT INTO t2 VALUES (3,8601,'John S');
+UPDATE t1, t2 SET t2.name = 'John Smith' WHERE t1.user_num = t2.user_num;
+DROP TABLE t1, t2;
 # Bug#39338: Fieldnames in
 #   INFORMATIONSCHEMA.PARTITIONS.PARTITION_EXPRESSION become unescaped
 # NOTE: the partition expression is saved as a string, so changing from
@@ -1472,7 +1497,7 @@ NULL
 2
 explain partitions select * from t1 where a is null or a < 0 or a > 1;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pn,p2	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t1	pn,p2	ALL	NULL	NULL	NULL	NULL	2	Using where
 drop table t1;
 CREATE TABLE t1 (id INT NOT NULL PRIMARY KEY, name VARCHAR(20)) 
 ENGINE=MyISAM DEFAULT CHARSET=latin1

mysql-test/r/partition_hash.result

@@ -69,31 +69,31 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	p0,p1,p2,p3	ALL	NULL	NULL	NULL	NULL	9	Using where
 explain partitions select * from t1 where a is null or (a >= 5 and a <= 7);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0,p2,p3	ALL	NULL	NULL	NULL	NULL	9	Using where
+1	SIMPLE	t1	p0,p2,p3	ALL	NULL	NULL	NULL	NULL	7	Using where
 explain partitions select * from t1 where a is null;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	9	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	3	Using where
 explain partitions select * from t1 where a is not null;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	p0,p1,p2,p3	ALL	NULL	NULL	NULL	NULL	9	Using where
 explain partitions select * from t1 where a >= 1 and a < 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0,p1	ALL	NULL	NULL	NULL	NULL	9	Using where
+1	SIMPLE	t1	p0,p1	ALL	NULL	NULL	NULL	NULL	5	Using where
 explain partitions select * from t1 where a >= 3 and a <= 5;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p1,p2	ALL	NULL	NULL	NULL	NULL	9	Using where
+1	SIMPLE	t1	p1,p2	ALL	NULL	NULL	NULL	NULL	4	Using where
 explain partitions select * from t1 where a > 2 and a < 4;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p1	ALL	NULL	NULL	NULL	NULL	9	Using where
+1	SIMPLE	t1	p1	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a > 3 and a <= 6;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p2,p3	ALL	NULL	NULL	NULL	NULL	9	Using where
+1	SIMPLE	t1	p2,p3	ALL	NULL	NULL	NULL	NULL	4	Using where
 explain partitions select * from t1 where a > 5;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	p0,p1,p2,p3	ALL	NULL	NULL	NULL	NULL	9	Using where
 explain partitions select * from t1 where a >= 1 and a <= 5;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0,p1,p2	ALL	NULL	NULL	NULL	NULL	9	Using where
+1	SIMPLE	t1	p0,p1,p2	ALL	NULL	NULL	NULL	NULL	7	Using where
 drop table t1;
 CREATE TABLE t1 (
 a int not null,

mysql-test/r/partition_innodb.result

@@ -120,31 +120,31 @@ insert INTO t1 VALUES (110);
 ERROR HY000: Table has no partition for value 110
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a > 90;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1		ALL	NULL	NULL	NULL	NULL	5	Using where
+1	SIMPLE	t1		ALL	NULL	NULL	NULL	NULL	0	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a >= 90;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1		ALL	NULL	NULL	NULL	NULL	5	Using where
+1	SIMPLE	t1		ALL	NULL	NULL	NULL	NULL	0	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a = 90;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1		ALL	NULL	NULL	NULL	NULL	5	Using where
+1	SIMPLE	t1		ALL	NULL	NULL	NULL	NULL	0	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a = 89;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p90	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	p90	ALL	NULL	NULL	NULL	NULL	3	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a >= 89;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p90	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	p90	ALL	NULL	NULL	NULL	NULL	3	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a > 89;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1		ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1		ALL	NULL	NULL	NULL	NULL	0	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a = 100;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1		ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1		ALL	NULL	NULL	NULL	NULL	0	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a >= 100;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1		ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1		ALL	NULL	NULL	NULL	NULL	0	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a > 100;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1		ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1		ALL	NULL	NULL	NULL	NULL	0	Using where
 DROP TABLE t1;
 #
 # Bug#50104: Partitioned table with just 1 partion works with fk

mysql-test/r/partition_range.result

@@ -53,10 +53,10 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	p0,p1	ALL	NULL	NULL	NULL	NULL	4	Using where
 explain partitions select * from t1 where a <= '2007-03-07 23:59:59';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a < '2007-03-07 23:59:59';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	2	Using where
 show create table t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
@@ -203,13 +203,13 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	pnull	system	NULL	NULL	NULL	NULL	1	
 explain partitions select * from t1 where a >= 0;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0,p1	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t1	p0,p1	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a < 0;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
 explain partitions select * from t1 where a <= 0;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pnull,p0	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t1	pnull,p0	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a > 1;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
@@ -242,16 +242,16 @@ select * from t1 where a > 1;
 a	b
 explain partitions select * from t1 where a is null;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pnull_pnullsp0,pnull_pnullsp1	ALL	NULL	NULL	NULL	NULL	6	Using where
+1	SIMPLE	t1	pnull_pnullsp0,pnull_pnullsp1	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a >= 0;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0_p0sp0,p0_p0sp1,p1_p1sp0,p1_p1sp1	ALL	NULL	NULL	NULL	NULL	6	Using where
+1	SIMPLE	t1	p0_p0sp0,p0_p0sp1,p1_p1sp0,p1_p1sp1	ALL	NULL	NULL	NULL	NULL	4	Using where
 explain partitions select * from t1 where a < 0;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pnull_pnullsp0,pnull_pnullsp1	ALL	NULL	NULL	NULL	NULL	6	Using where
+1	SIMPLE	t1	pnull_pnullsp0,pnull_pnullsp1	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a <= 0;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pnull_pnullsp0,pnull_pnullsp1,p0_p0sp0,p0_p0sp1	ALL	NULL	NULL	NULL	NULL	6	Using where
+1	SIMPLE	t1	pnull_pnullsp0,pnull_pnullsp1,p0_p0sp0,p0_p0sp1	ALL	NULL	NULL	NULL	NULL	4	Using where
 explain partitions select * from t1 where a > 1;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables

mysql-test/suite/parts/r/partition_alter3_innodb.result

@@ -148,7 +148,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	part1	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	part1	ALL	NULL	NULL	NULL	NULL	7	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -176,7 +176,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	5	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -209,7 +209,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	3	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -252,7 +252,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p6	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p6	ALL	NULL	NULL	NULL	NULL	3	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -280,7 +280,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	4	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -306,7 +306,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	4	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -330,7 +330,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	5	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -352,7 +352,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	part1	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	part1	ALL	NULL	NULL	NULL	NULL	7	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -372,7 +372,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	10	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -505,7 +505,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	7	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -533,7 +533,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	5	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -569,7 +569,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p6	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p6	ALL	NULL	NULL	NULL	NULL	3	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -610,7 +610,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	4	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -641,7 +641,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	3	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -670,7 +670,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	23	Using where
+1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	10	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -697,7 +697,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	5	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -722,7 +722,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	7	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -745,7 +745,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	10	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1

mysql-test/suite/parts/r/partition_alter3_myisam.result

@@ -155,7 +155,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	part1	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	part1	ALL	NULL	NULL	NULL	NULL	7	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -187,7 +187,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	5	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -228,7 +228,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	3	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -278,7 +278,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p6	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p6	ALL	NULL	NULL	NULL	NULL	3	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -312,7 +312,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	4	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -343,7 +343,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	4	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -371,7 +371,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	5	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -396,7 +396,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	part1	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	part1	ALL	NULL	NULL	NULL	NULL	7	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -418,7 +418,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	10	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -552,7 +552,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	7	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -584,7 +584,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	5	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -628,7 +628,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p6	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p6	ALL	NULL	NULL	NULL	NULL	3	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -676,7 +676,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	4	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -713,7 +713,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	3	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -747,7 +747,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	10	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -778,7 +778,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	5	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -806,7 +806,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	7	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -831,7 +831,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	10	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1

mysql-test/t/partition.test

@@ -14,6 +14,34 @@
 drop table if exists t1, t2;
 --enable_warnings
 
+--echo #
+--echo # Bug#55458: Partitioned MyISAM table gets crashed by multi-table update 
+--echo #
+CREATE TABLE t1 (
+  `id` int NOT NULL,
+  `user_num` int DEFAULT NULL,
+  PRIMARY KEY (`id`)
+) ENGINE=MyISAM CHARSET=latin1;
+INSERT INTO t1 VALUES (1,8601);
+INSERT INTO t1 VALUES (2,8601);
+INSERT INTO t1 VALUES (3,8601);
+INSERT INTO t1 VALUES (4,8601);
+CREATE TABLE t2 (
+  `id` int(11) NOT NULL,
+  `user_num` int DEFAULT NULL,
+  `name` varchar(64) NOT NULL,
+  PRIMARY KEY (`id`)
+) ENGINE=MyISAM CHARSET=latin1
+PARTITION BY HASH (id)
+PARTITIONS 2;
+INSERT INTO t2 VALUES (1,8601,'John');
+INSERT INTO t2 VALUES (2,8601,'JS');
+INSERT INTO t2 VALUES (3,8601,'John S');
+
+UPDATE t1, t2 SET t2.name = 'John Smith' WHERE t1.user_num = t2.user_num;
+
+DROP TABLE t1, t2;
+
 --echo # Bug#39338: Fieldnames in
 --echo #   INFORMATIONSCHEMA.PARTITIONS.PARTITION_EXPRESSION become unescaped
 --echo # NOTE: the partition expression is saved as a string, so changing from

mysql-test/t/partition_pruning.test

@@ -8,6 +8,30 @@
 drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
 --enable_warnings
 
+--echo #
+--echo # Bug#53806: Wrong estimates for range query in partitioned MyISAM table
+--echo # Bug#46754: 'rows' field doesn't reflect partition pruning
+--echo #
+CREATE TABLE t1 (a INT PRIMARY KEY)
+PARTITION BY RANGE (a) (
+PARTITION p0 VALUES LESS THAN (1),
+PARTITION p1 VALUES LESS THAN (2),
+PARTITION p2 VALUES LESS THAN (3),
+PARTITION p3 VALUES LESS THAN (4),
+PARTITION p4 VALUES LESS THAN (5),
+PARTITION p5 VALUES LESS THAN (6),
+PARTITION max VALUES LESS THAN MAXVALUE);
+
+INSERT INTO t1 VALUES (-1),(0),(1),(2),(3),(4),(5),(6),(7),(8);
+
+--replace_column 1 # 2 # 3 # 4 # 5 # 6 # 7 # 8 # 9 # 11 #
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a <= 1;
+--replace_column 1 # 2 # 3 # 4 # 5 # 6 # 7 # 8 # 9 # 11 #
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a < 7;
+--replace_column 1 # 2 # 3 # 4 # 5 # 6 # 7 # 8 # 9 # 11 #
+EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a <= 1;
+DROP TABLE t1;
+
 --echo #
 --echo # Bug#49742: Partition Pruning not working correctly for RANGE
 --echo #

sql/ha_partition.cc

@@ -231,6 +231,8 @@ void ha_partition::init_handler_variables()
   m_innodb= FALSE;
   m_extra_cache= FALSE;
   m_extra_cache_size= 0;
+  m_extra_prepare_for_update= FALSE;
+  m_extra_cache_part_id= NO_CURRENT_PART_ID;
   m_handler_status= handler_not_initialized;
   m_low_byte_first= 1;
   m_part_field_array= NULL;
@@ -5515,9 +5517,6 @@ void ha_partition::get_dynamic_partition_info(PARTITION_STATS *stat_info,
     when performing the sequential scan we will check this recorded value
     and call extra_opt whenever we start scanning a new partition.
 
-    monty: Neads to be fixed so that it's passed to all handlers when we
-    move to another partition during table scan.
-
   HA_EXTRA_NO_CACHE:
     When performing a UNION SELECT HA_EXTRA_NO_CACHE is called from the
     flush method in the select_union class.
@@ -5529,7 +5528,7 @@ void ha_partition::get_dynamic_partition_info(PARTITION_STATS *stat_info,
     for. If no cache is in use they will quickly return after finding
     this out. And we also ensure that all caches are disabled and no one
     is left by mistake.
-    In the future this call will probably be deleted an we will instead call
+    In the future this call will probably be deleted and we will instead call
     ::reset();
 
   HA_EXTRA_WRITE_CACHE:
@@ -5541,8 +5540,9 @@ void ha_partition::get_dynamic_partition_info(PARTITION_STATS *stat_info,
     This is called as part of a multi-table update. When the table to be
     updated is also scanned then this informs MyISAM handler to drop any
     caches if dynamic records are used (fixed size records do not care
-    about this call). We pass this along to all underlying MyISAM handlers
-    and ignore it for the rest.
+    about this call). We pass this along to the first partition to scan, and
+    flag that it is to be called after HA_EXTRA_CACHE when moving to the next
+    partition to scan.
 
   HA_EXTRA_PREPARE_FOR_DROP:
     Only used by MyISAM, called in preparation for a DROP TABLE.
@@ -5697,9 +5697,21 @@ int ha_partition::extra(enum ha_extra_function operation)
   case HA_EXTRA_PREPARE_FOR_RENAME:
     DBUG_RETURN(prepare_for_rename());
     break;
+  case HA_EXTRA_PREPARE_FOR_UPDATE:
+    DBUG_ASSERT(m_extra_cache);
+    /*
+      Needs to be run on the first partition in the range now, and 
+      later in late_extra_cache, when switching to a new partition to scan.
+    */
+    m_extra_prepare_for_update= TRUE;
+    if (m_part_spec.start_part != NO_CURRENT_PART_ID)
+    {
+      DBUG_ASSERT(m_extra_cache_part_id == m_part_spec.start_part);
+      (void) m_file[m_part_spec.start_part]->extra(HA_EXTRA_PREPARE_FOR_UPDATE);
+    }
+    break;
   case HA_EXTRA_NORMAL:
   case HA_EXTRA_QUICK:
-  case HA_EXTRA_PREPARE_FOR_UPDATE:
   case HA_EXTRA_FORCE_REOPEN:
   case HA_EXTRA_PREPARE_FOR_DROP:
   case HA_EXTRA_FLUSH_CACHE:
@@ -5722,10 +5734,22 @@ int ha_partition::extra(enum ha_extra_function operation)
     break;
   }
   case HA_EXTRA_NO_CACHE:
+  {
+    int ret= 0;
+    if (m_extra_cache_part_id != NO_CURRENT_PART_ID)
+      ret= m_file[m_extra_cache_part_id]->extra(HA_EXTRA_NO_CACHE);
+    m_extra_cache= FALSE;
+    m_extra_cache_size= 0;
+    m_extra_prepare_for_update= FALSE;
+    m_extra_cache_part_id= NO_CURRENT_PART_ID;
+    DBUG_RETURN(ret);
+  }
   case HA_EXTRA_WRITE_CACHE:
   {
     m_extra_cache= FALSE;
     m_extra_cache_size= 0;
+    m_extra_prepare_for_update= FALSE;
+    m_extra_cache_part_id= NO_CURRENT_PART_ID;
     DBUG_RETURN(loop_extra(operation));
   }
   case HA_EXTRA_IGNORE_NO_KEY:
@@ -5862,6 +5886,7 @@ int ha_partition::extra_opt(enum ha_extra_function operation, ulong cachesize)
 void ha_partition::prepare_extra_cache(uint cachesize)
 {
   DBUG_ENTER("ha_partition::prepare_extra_cache()");
+  DBUG_PRINT("info", ("cachesize %u", cachesize));
 
   m_extra_cache= TRUE;
   m_extra_cache_size= cachesize;
@@ -5920,16 +5945,18 @@ int ha_partition::loop_extra(enum ha_extra_function operation)
 {
   int result= 0, tmp;
   handler **file;
+  bool is_select;
   DBUG_ENTER("ha_partition::loop_extra()");
   
-  /* 
-    TODO, 5.2: this is where you could possibly add optimisations to add the bitmap
-    _if_ a SELECT.
-  */
+  is_select= (thd_sql_command(ha_thd()) == SQLCOM_SELECT);
   for (file= m_file; *file; file++)
   {
-    if ((tmp= (*file)->extra(operation)))
-      result= tmp;
+    if (!is_select ||
+        bitmap_is_set(&(m_part_info->used_partitions), file - m_file))
+    {
+      if ((tmp= (*file)->extra(operation)))
+        result= tmp;
+    }
   }
   DBUG_RETURN(result);
 }
@@ -5950,14 +5977,22 @@ void ha_partition::late_extra_cache(uint partition_id)
 {
   handler *file;
   DBUG_ENTER("ha_partition::late_extra_cache");
+  DBUG_PRINT("info", ("extra_cache %u partid %u size %u", m_extra_cache,
+                      partition_id, m_extra_cache_size));
 
-  if (!m_extra_cache)
+  if (!m_extra_cache && !m_extra_prepare_for_update)
     DBUG_VOID_RETURN;
   file= m_file[partition_id];
   if (m_extra_cache_size == 0)
     (void) file->extra(HA_EXTRA_CACHE);
   else
     (void) file->extra_opt(HA_EXTRA_CACHE, m_extra_cache_size);
+  if (m_extra_prepare_for_update)
+  {
+    DBUG_ASSERT(m_extra_cache);
+    (void) file->extra(HA_EXTRA_PREPARE_FOR_UPDATE);
+  }
+  m_extra_cache_part_id= partition_id;
   DBUG_VOID_RETURN;
 }
 
@@ -5978,10 +6013,12 @@ void ha_partition::late_extra_no_cache(uint partition_id)
   handler *file;
   DBUG_ENTER("ha_partition::late_extra_no_cache");
 
-  if (!m_extra_cache)
+  if (!m_extra_cache && !m_extra_prepare_for_update)
     DBUG_VOID_RETURN;
   file= m_file[partition_id];
   (void) file->extra(HA_EXTRA_NO_CACHE);
+  DBUG_ASSERT(partition_id == m_extra_cache_part_id);
+  m_extra_cache_part_id= NO_CURRENT_PART_ID;
   DBUG_VOID_RETURN;
 }
 

sql/ha_partition.h

@@ -137,6 +137,10 @@ class ha_partition :public handler
   */
   bool m_extra_cache;
   uint m_extra_cache_size;
+  /* The same goes for HA_EXTRA_PREPARE_FOR_UPDATE */
+  bool m_extra_prepare_for_update;
+  /* Which partition has active cache */
+  uint m_extra_cache_part_id;
 
   void init_handler_variables();
   /*

sql/sql_select.cc

@@ -16705,7 +16705,15 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
         if (tab->select && tab->select->quick)
           examined_rows= tab->select->quick->records;
         else if (tab->type == JT_NEXT || tab->type == JT_ALL)
-          examined_rows= tab->limit ? tab->limit : tab->table->file->records();
+        {
+          if (tab->limit)
+            examined_rows= tab->limit;
+          else
+          {
+            tab->table->file->info(HA_STATUS_VARIABLE);
+            examined_rows= tab->table->file->stats.records;
+          }
+        }
         else
           examined_rows=(ha_rows)join->best_positions[i].records_read;