From 55597a48698b267b966873727b079cd3ac0d1c18 Mon Sep 17 00:00:00 2001 From: Sergey Petrunya Date: Wed, 25 Jul 2012 20:41:48 +0400 Subject: MDEV-410: EXPLAIN shows type=range, while SHOW EXPLAIN and userstat show full table scan is used - Make Item_subselect::fix_fields() ignore UNCACHEABLE_EXPLAIN flag when deciding whether the subquery item should be marked as constant. --- mysql-test/r/func_group.result | 2 +- mysql-test/r/subselect.result | 38 +++++++++++++ mysql-test/r/subselect2.result | 12 ++--- mysql-test/r/subselect4.result | 84 ++++++++++++++--------------- mysql-test/r/subselect_mat.result | 2 +- mysql-test/r/subselect_mat_cost_bugs.result | 2 +- mysql-test/r/subselect_no_mat.result | 38 +++++++++++++ mysql-test/r/subselect_no_opts.result | 38 +++++++++++++ mysql-test/r/subselect_no_scache.result | 38 +++++++++++++ mysql-test/r/subselect_no_semijoin.result | 38 +++++++++++++ 10 files changed, 241 insertions(+), 51 deletions(-) (limited to 'mysql-test/r') diff --git a/mysql-test/r/func_group.result b/mysql-test/r/func_group.result index c38201f6d9f..3b47227a261 100644 --- a/mysql-test/r/func_group.result +++ b/mysql-test/r/func_group.result @@ -1838,7 +1838,7 @@ id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 range a a 4 NULL 4 100.00 Using where; Using index 2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL No tables used Warnings: -Note 1003 select max(`test`.`t1`.`a`) AS `MAX(a)` from `test`.`t1` where (<(1),(2)>((((1,2)),(select 3,4 having (((1 = 3) or isnull(3)) and ((2 = 4) or isnull(4)) and (3) and (4))))) and (`test`.`t1`.`a` < 10)) +Note 1003 select max(`test`.`t1`.`a`) AS `MAX(a)` from `test`.`t1` where ((((1,2),(select 3,4 having (((1 = 3) or isnull(3)) and ((2 = 4) or isnull(4)) and (3) and (4))))) and (`test`.`t1`.`a` < 10)) SELECT MAX(a) FROM t1 WHERE (1,2) IN (SELECT 3,4) AND a<10; MAX(a) NULL diff --git a/mysql-test/r/subselect.result b/mysql-test/r/subselect.result index 1863cd09c38..3ea6c0be398 100644 --- a/mysql-test/r/subselect.result +++ b/mysql-test/r/subselect.result @@ -6768,5 +6768,43 @@ id select_type table type possible_keys key key_len ref rows Extra SELECT * FROM t1 WHERE 4 IN (SELECT MAX(b) FROM t2 WHERE EXISTS (SELECT * FROM t1)); a drop table t1,t2; +# +# MDEV-410: EXPLAIN shows type=range, while SHOW EXPLAIN and userstat show full table scan is used +# +CREATE TABLE t1 (a VARCHAR(3) PRIMARY KEY) ENGINE=MyISAM; +INSERT INTO t1 VALUES ('USA'); +CREATE TABLE t2 (b INT, c VARCHAR(52), KEY(b)) ENGINE=MyISAM; +INSERT INTO t2 VALUES (3813,'United States'),(3940,'Russia'); +CREATE TABLE t3 (d INT, KEY(d)) ENGINE=MyISAM; +INSERT INTO t3 VALUES (12),(22),(9),(45); +create table t4 like t3; +insert into t4 select * from t3; +# This should not show range access for table t2 +explain +SELECT MIN(b) FROM ( SELECT * FROM t1, t2, t3 WHERE d = b ) AS alias1 +WHERE SLEEP(0.1) OR c < 'p' OR b = ( SELECT MIN(b) FROM t2 ); +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1 system NULL NULL NULL NULL 1 +1 PRIMARY t2 ALL b NULL NULL NULL 2 Using where +1 PRIMARY t3 ref d d 5 test.t2.b 2 Using where; Using index +3 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Select tables optimized away +set @tmp_mdev410=@@global.userstat; +set global userstat=on; +flush table_statistics; +flush index_statistics; +SELECT MIN(b) FROM ( SELECT * FROM t1, t2, t3 WHERE d = b ) AS alias1 +WHERE SLEEP(0.1) OR c < 'p' OR b = ( SELECT MIN(b) FROM t2 ); +MIN(b) +NULL +# The following shows that t2 was indeed scanned with a full scan. +show table_statistics; +Table_schema Table_name Rows_read Rows_changed Rows_changed_x_#indexes +test t1 2 0 0 +test t2 3 0 0 +show index_statistics; +Table_schema Table_name Index_name Rows_read +test t2 b 1 +set global userstat=@tmp_mdev410; +DROP TABLE t1,t2,t3,t4; # return optimizer switch changed in the beginning of this test set optimizer_switch=@subselect_tmp; diff --git a/mysql-test/r/subselect2.result b/mysql-test/r/subselect2.result index 41c445329cb..ed00e4ef684 100644 --- a/mysql-test/r/subselect2.result +++ b/mysql-test/r/subselect2.result @@ -161,18 +161,18 @@ SET optimizer_switch='materialization=on,in_to_exists=on'; EXPLAIN SELECT * FROM t2,t3 WHERE (2,9) IN (SELECT DISTINCT a,pk FROM t1) OR a = b; id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t2 index a a 5 NULL 2 Using index -1 PRIMARY t3 index b b 5 NULL 4 Using where; Using index; Using join buffer (flat, BNL join) -2 MATERIALIZED t1 index PRIMARY,a a 5 NULL 2 Using index +1 PRIMARY t2 index a a 5 NULL 2 Using where; Using index +1 PRIMARY t3 ref b b 5 test.t2.a 2 Using index +2 SUBQUERY t1 index_subquery PRIMARY,a a 5 const 0 Using index; Using where SELECT * FROM t2,t3 WHERE (2,9) IN (SELECT DISTINCT a,pk FROM t1) OR a = b; pk a b 0 4 4 EXPLAIN SELECT * FROM t2,t3 WHERE (2,9) IN (SELECT DISTINCT a,pk FROM v1) OR a = b; id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t2 index a a 5 NULL 2 Using index -1 PRIMARY t3 index b b 5 NULL 4 Using where; Using index; Using join buffer (flat, BNL join) -2 MATERIALIZED t1 index PRIMARY,a a 5 NULL 2 Using index +1 PRIMARY t2 index a a 5 NULL 2 Using where; Using index +1 PRIMARY t3 ref b b 5 test.t2.a 2 Using index +2 SUBQUERY t1 index_subquery PRIMARY,a a 5 const 0 Using index; Using where SELECT * FROM t2,t3 WHERE (2,9) IN (SELECT DISTINCT a,pk FROM v1) OR a = b; pk a b 0 4 4 diff --git a/mysql-test/r/subselect4.result b/mysql-test/r/subselect4.result index 06e746f3238..0f9912fc1f3 100644 --- a/mysql-test/r/subselect4.result +++ b/mysql-test/r/subselect4.result @@ -627,51 +627,51 @@ SET @@optimizer_switch = 'materialization=on,in_to_exists=off,semijoin=off'; EXPLAIN SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4) FROM t2); id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables -2 MATERIALIZED t2 system NULL NULL NULL NULL 0 const row not found +1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE +2 MATERIALIZED NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4) FROM t2); f1 f2 EXPLAIN SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3+f4, min(f4) FROM t2); id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables -2 MATERIALIZED t2 system NULL NULL NULL NULL 0 const row not found +1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE +2 MATERIALIZED NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3+f4, min(f4) FROM t2); f1 f2 EXPLAIN SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4)+max(f4) FROM t2); id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables -2 MATERIALIZED t2 system NULL NULL NULL NULL 0 const row not found +1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE +2 MATERIALIZED NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4)+max(f4) FROM t2); f1 f2 EXPLAIN SELECT (2, 0) NOT IN (SELECT f3, min(f4) FROM t2) as not_in; 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 -2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found +2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT (2, 0) NOT IN (SELECT f3, min(f4) FROM t2) as not_in; not_in NULL EXPLAIN SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, count(f4) FROM t2); id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables -2 MATERIALIZED t2 system NULL NULL NULL NULL 0 const row not found +1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE +2 MATERIALIZED NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, count(f4) FROM t2); f1 f2 EXPLAIN SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, f3 + count(f4) FROM t2); id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables -2 MATERIALIZED t2 system NULL NULL NULL NULL 0 const row not found +1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE +2 MATERIALIZED NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, f3 + count(f4) FROM t2); f1 f2 EXPLAIN SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2) as not_in; 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 -2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found +2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2) as not_in; not_in NULL @@ -679,7 +679,7 @@ EXPLAIN SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 HAVING max(f4) > 7) as not_in; 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 -2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found +2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 HAVING max(f4) > 7) as not_in; not_in 1 @@ -687,7 +687,7 @@ EXPLAIN SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 HAVING max(f4) is null) as not_in; 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 -2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found +2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 HAVING max(f4) is null) as not_in; not_in NULL @@ -695,7 +695,7 @@ EXPLAIN SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4) FROM t2) as not_in; 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 -2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found +2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4) FROM t2) as not_in; not_in NULL @@ -703,7 +703,7 @@ EXPLAIN SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4)+f3 FROM t2) as not_in; 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 -2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found +2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4)+f3 FROM t2) as not_in; not_in NULL @@ -718,51 +718,51 @@ SET @@optimizer_switch = 'materialization=off,in_to_exists=on,semijoin=off'; EXPLAIN SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4) FROM t2); id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables -2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found +1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE +2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4) FROM t2); f1 f2 EXPLAIN SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3+f4, min(f4) FROM t2); id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables -2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found +1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE +2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3+f4, min(f4) FROM t2); f1 f2 EXPLAIN SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4)+max(f4) FROM t2); id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables -2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found +1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE +2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4)+max(f4) FROM t2); f1 f2 EXPLAIN SELECT (2, 0) NOT IN (SELECT f3, min(f4) FROM t2) as not_in; 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 -2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found +2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT (2, 0) NOT IN (SELECT f3, min(f4) FROM t2) as not_in; not_in NULL EXPLAIN SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, count(f4) FROM t2); id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables -2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found +1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE +2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, count(f4) FROM t2); f1 f2 EXPLAIN SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, f3 + count(f4) FROM t2); id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables -2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found +1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE +2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, f3 + count(f4) FROM t2); f1 f2 EXPLAIN SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2) as not_in; 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 -2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found +2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2) as not_in; not_in NULL @@ -770,7 +770,7 @@ EXPLAIN SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 HAVING max(f4) > 7) as not_in; 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 -2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found +2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 HAVING max(f4) > 7) as not_in; not_in 1 @@ -778,7 +778,7 @@ EXPLAIN SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 HAVING max(f4) is null) as not_in; 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 -2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found +2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 HAVING max(f4) is null) as not_in; not_in NULL @@ -786,7 +786,7 @@ EXPLAIN SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4) FROM t2) as not_in; 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 -2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found +2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4) FROM t2) as not_in; not_in NULL @@ -794,7 +794,7 @@ EXPLAIN SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4)+f3 FROM t2) as not_in; 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 -2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found +2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4)+f3 FROM t2) as not_in; not_in NULL @@ -813,21 +813,21 @@ SET @@optimizer_switch = 'materialization=on,in_to_exists=off,semijoin=off'; EXPLAIN SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4) FROM t2 WHERE f3 > 10); id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t1 ALL NULL NULL NULL NULL 2 +1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE 2 MATERIALIZED t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4) FROM t2 WHERE f3 > 10); f1 f2 EXPLAIN SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3+f4, min(f4) FROM t2 WHERE f3 > 10); id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t1 ALL NULL NULL NULL NULL 2 +1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE 2 MATERIALIZED t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3+f4, min(f4) FROM t2 WHERE f3 > 10); f1 f2 EXPLAIN SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4)+max(f4) FROM t2 WHERE f3 > 10); id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t1 ALL NULL NULL NULL NULL 2 +1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE 2 MATERIALIZED t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4)+max(f4) FROM t2 WHERE f3 > 10); f1 f2 @@ -842,14 +842,14 @@ NULL EXPLAIN SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10); id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t1 ALL NULL NULL NULL NULL 2 +1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE 2 MATERIALIZED t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10); f1 f2 EXPLAIN SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, f3 + count(f4) FROM t2 WHERE f3 > 10); id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t1 ALL NULL NULL NULL NULL 2 +1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE 2 MATERIALIZED t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, f3 + count(f4) FROM t2 WHERE f3 > 10); f1 f2 @@ -904,21 +904,21 @@ SET @@optimizer_switch = 'materialization=off,in_to_exists=on,semijoin=off'; EXPLAIN SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4) FROM t2 WHERE f3 > 10); id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t1 ALL NULL NULL NULL NULL 2 +1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE 2 SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4) FROM t2 WHERE f3 > 10); f1 f2 EXPLAIN SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3+f4, min(f4) FROM t2 WHERE f3 > 10); id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t1 ALL NULL NULL NULL NULL 2 +1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE 2 SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3+f4, min(f4) FROM t2 WHERE f3 > 10); f1 f2 EXPLAIN SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4)+max(f4) FROM t2 WHERE f3 > 10); id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t1 ALL NULL NULL NULL NULL 2 +1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE 2 SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4)+max(f4) FROM t2 WHERE f3 > 10); f1 f2 @@ -933,14 +933,14 @@ NULL EXPLAIN SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10); id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t1 ALL NULL NULL NULL NULL 2 +1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE 2 SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10); f1 f2 EXPLAIN SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, f3 + count(f4) FROM t2 WHERE f3 > 10); id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t1 ALL NULL NULL NULL NULL 2 +1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE 2 SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, f3 + count(f4) FROM t2 WHERE f3 > 10); f1 f2 diff --git a/mysql-test/r/subselect_mat.result b/mysql-test/r/subselect_mat.result index 45d0b9ee519..9bb26e8a6e0 100644 --- a/mysql-test/r/subselect_mat.result +++ b/mysql-test/r/subselect_mat.result @@ -2183,7 +2183,7 @@ NULL EXPLAIN SELECT * FROM t2 WHERE (SELECT f3a, f3b FROM t3) NOT IN (SELECT f1a, f1b FROM t1); id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t2 ALL NULL NULL NULL NULL 2 +1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE 3 MATERIALIZED t1 ALL NULL NULL NULL NULL 2 2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT * FROM t2 WHERE (SELECT f3a, f3b FROM t3) NOT IN (SELECT f1a, f1b FROM t1); diff --git a/mysql-test/r/subselect_mat_cost_bugs.result b/mysql-test/r/subselect_mat_cost_bugs.result index 5a38fe7ca72..1d03f2e9fe6 100644 --- a/mysql-test/r/subselect_mat_cost_bugs.result +++ b/mysql-test/r/subselect_mat_cost_bugs.result @@ -162,7 +162,7 @@ EXPLAIN SELECT * FROM (SELECT * FROM t2) AS a2 WHERE (SELECT distinct SUM(distinct f3 ) FROM t1); id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables +1 PRIMARY system NULL NULL NULL NULL 0 const row not found 3 SUBQUERY t1 index NULL f3 5 NULL 2 Using index 2 DERIVED NULL NULL NULL NULL NULL NULL NULL no matching row in const table insert into t2 values (1),(2); diff --git a/mysql-test/r/subselect_no_mat.result b/mysql-test/r/subselect_no_mat.result index 78ab87dbfd6..8ce097787f1 100644 --- a/mysql-test/r/subselect_no_mat.result +++ b/mysql-test/r/subselect_no_mat.result @@ -6766,6 +6766,44 @@ id select_type table type possible_keys key key_len ref rows Extra SELECT * FROM t1 WHERE 4 IN (SELECT MAX(b) FROM t2 WHERE EXISTS (SELECT * FROM t1)); a drop table t1,t2; +# +# MDEV-410: EXPLAIN shows type=range, while SHOW EXPLAIN and userstat show full table scan is used +# +CREATE TABLE t1 (a VARCHAR(3) PRIMARY KEY) ENGINE=MyISAM; +INSERT INTO t1 VALUES ('USA'); +CREATE TABLE t2 (b INT, c VARCHAR(52), KEY(b)) ENGINE=MyISAM; +INSERT INTO t2 VALUES (3813,'United States'),(3940,'Russia'); +CREATE TABLE t3 (d INT, KEY(d)) ENGINE=MyISAM; +INSERT INTO t3 VALUES (12),(22),(9),(45); +create table t4 like t3; +insert into t4 select * from t3; +# This should not show range access for table t2 +explain +SELECT MIN(b) FROM ( SELECT * FROM t1, t2, t3 WHERE d = b ) AS alias1 +WHERE SLEEP(0.1) OR c < 'p' OR b = ( SELECT MIN(b) FROM t2 ); +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1 system NULL NULL NULL NULL 1 +1 PRIMARY t2 ALL b NULL NULL NULL 2 Using where +1 PRIMARY t3 ref d d 5 test.t2.b 2 Using where; Using index +3 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Select tables optimized away +set @tmp_mdev410=@@global.userstat; +set global userstat=on; +flush table_statistics; +flush index_statistics; +SELECT MIN(b) FROM ( SELECT * FROM t1, t2, t3 WHERE d = b ) AS alias1 +WHERE SLEEP(0.1) OR c < 'p' OR b = ( SELECT MIN(b) FROM t2 ); +MIN(b) +NULL +# The following shows that t2 was indeed scanned with a full scan. +show table_statistics; +Table_schema Table_name Rows_read Rows_changed Rows_changed_x_#indexes +test t1 2 0 0 +test t2 3 0 0 +show index_statistics; +Table_schema Table_name Index_name Rows_read +test t2 b 1 +set global userstat=@tmp_mdev410; +DROP TABLE t1,t2,t3,t4; # return optimizer switch changed in the beginning of this test set optimizer_switch=@subselect_tmp; set optimizer_switch=default; diff --git a/mysql-test/r/subselect_no_opts.result b/mysql-test/r/subselect_no_opts.result index f822a4500f4..466d8c8fd06 100644 --- a/mysql-test/r/subselect_no_opts.result +++ b/mysql-test/r/subselect_no_opts.result @@ -6763,6 +6763,44 @@ id select_type table type possible_keys key key_len ref rows Extra SELECT * FROM t1 WHERE 4 IN (SELECT MAX(b) FROM t2 WHERE EXISTS (SELECT * FROM t1)); a drop table t1,t2; +# +# MDEV-410: EXPLAIN shows type=range, while SHOW EXPLAIN and userstat show full table scan is used +# +CREATE TABLE t1 (a VARCHAR(3) PRIMARY KEY) ENGINE=MyISAM; +INSERT INTO t1 VALUES ('USA'); +CREATE TABLE t2 (b INT, c VARCHAR(52), KEY(b)) ENGINE=MyISAM; +INSERT INTO t2 VALUES (3813,'United States'),(3940,'Russia'); +CREATE TABLE t3 (d INT, KEY(d)) ENGINE=MyISAM; +INSERT INTO t3 VALUES (12),(22),(9),(45); +create table t4 like t3; +insert into t4 select * from t3; +# This should not show range access for table t2 +explain +SELECT MIN(b) FROM ( SELECT * FROM t1, t2, t3 WHERE d = b ) AS alias1 +WHERE SLEEP(0.1) OR c < 'p' OR b = ( SELECT MIN(b) FROM t2 ); +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1 system NULL NULL NULL NULL 1 +1 PRIMARY t2 ALL b NULL NULL NULL 2 Using where +1 PRIMARY t3 ref d d 5 test.t2.b 2 Using where; Using index +3 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Select tables optimized away +set @tmp_mdev410=@@global.userstat; +set global userstat=on; +flush table_statistics; +flush index_statistics; +SELECT MIN(b) FROM ( SELECT * FROM t1, t2, t3 WHERE d = b ) AS alias1 +WHERE SLEEP(0.1) OR c < 'p' OR b = ( SELECT MIN(b) FROM t2 ); +MIN(b) +NULL +# The following shows that t2 was indeed scanned with a full scan. +show table_statistics; +Table_schema Table_name Rows_read Rows_changed Rows_changed_x_#indexes +test t1 2 0 0 +test t2 3 0 0 +show index_statistics; +Table_schema Table_name Index_name Rows_read +test t2 b 1 +set global userstat=@tmp_mdev410; +DROP TABLE t1,t2,t3,t4; # return optimizer switch changed in the beginning of this test set optimizer_switch=@subselect_tmp; set @optimizer_switch_for_subselect_test=null; diff --git a/mysql-test/r/subselect_no_scache.result b/mysql-test/r/subselect_no_scache.result index cdad363313d..1fde0d08d7e 100644 --- a/mysql-test/r/subselect_no_scache.result +++ b/mysql-test/r/subselect_no_scache.result @@ -6774,6 +6774,44 @@ id select_type table type possible_keys key key_len ref rows Extra SELECT * FROM t1 WHERE 4 IN (SELECT MAX(b) FROM t2 WHERE EXISTS (SELECT * FROM t1)); a drop table t1,t2; +# +# MDEV-410: EXPLAIN shows type=range, while SHOW EXPLAIN and userstat show full table scan is used +# +CREATE TABLE t1 (a VARCHAR(3) PRIMARY KEY) ENGINE=MyISAM; +INSERT INTO t1 VALUES ('USA'); +CREATE TABLE t2 (b INT, c VARCHAR(52), KEY(b)) ENGINE=MyISAM; +INSERT INTO t2 VALUES (3813,'United States'),(3940,'Russia'); +CREATE TABLE t3 (d INT, KEY(d)) ENGINE=MyISAM; +INSERT INTO t3 VALUES (12),(22),(9),(45); +create table t4 like t3; +insert into t4 select * from t3; +# This should not show range access for table t2 +explain +SELECT MIN(b) FROM ( SELECT * FROM t1, t2, t3 WHERE d = b ) AS alias1 +WHERE SLEEP(0.1) OR c < 'p' OR b = ( SELECT MIN(b) FROM t2 ); +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1 system NULL NULL NULL NULL 1 +1 PRIMARY t2 ALL b NULL NULL NULL 2 Using where +1 PRIMARY t3 ref d d 5 test.t2.b 2 Using where; Using index +3 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Select tables optimized away +set @tmp_mdev410=@@global.userstat; +set global userstat=on; +flush table_statistics; +flush index_statistics; +SELECT MIN(b) FROM ( SELECT * FROM t1, t2, t3 WHERE d = b ) AS alias1 +WHERE SLEEP(0.1) OR c < 'p' OR b = ( SELECT MIN(b) FROM t2 ); +MIN(b) +NULL +# The following shows that t2 was indeed scanned with a full scan. +show table_statistics; +Table_schema Table_name Rows_read Rows_changed Rows_changed_x_#indexes +test t1 2 0 0 +test t2 3 0 0 +show index_statistics; +Table_schema Table_name Index_name Rows_read +test t2 b 1 +set global userstat=@tmp_mdev410; +DROP TABLE t1,t2,t3,t4; # return optimizer switch changed in the beginning of this test set optimizer_switch=@subselect_tmp; set optimizer_switch=default; diff --git a/mysql-test/r/subselect_no_semijoin.result b/mysql-test/r/subselect_no_semijoin.result index 8e6d4bfccc2..ba50b8522eb 100644 --- a/mysql-test/r/subselect_no_semijoin.result +++ b/mysql-test/r/subselect_no_semijoin.result @@ -6763,6 +6763,44 @@ id select_type table type possible_keys key key_len ref rows Extra SELECT * FROM t1 WHERE 4 IN (SELECT MAX(b) FROM t2 WHERE EXISTS (SELECT * FROM t1)); a drop table t1,t2; +# +# MDEV-410: EXPLAIN shows type=range, while SHOW EXPLAIN and userstat show full table scan is used +# +CREATE TABLE t1 (a VARCHAR(3) PRIMARY KEY) ENGINE=MyISAM; +INSERT INTO t1 VALUES ('USA'); +CREATE TABLE t2 (b INT, c VARCHAR(52), KEY(b)) ENGINE=MyISAM; +INSERT INTO t2 VALUES (3813,'United States'),(3940,'Russia'); +CREATE TABLE t3 (d INT, KEY(d)) ENGINE=MyISAM; +INSERT INTO t3 VALUES (12),(22),(9),(45); +create table t4 like t3; +insert into t4 select * from t3; +# This should not show range access for table t2 +explain +SELECT MIN(b) FROM ( SELECT * FROM t1, t2, t3 WHERE d = b ) AS alias1 +WHERE SLEEP(0.1) OR c < 'p' OR b = ( SELECT MIN(b) FROM t2 ); +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1 system NULL NULL NULL NULL 1 +1 PRIMARY t2 ALL b NULL NULL NULL 2 Using where +1 PRIMARY t3 ref d d 5 test.t2.b 2 Using where; Using index +3 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Select tables optimized away +set @tmp_mdev410=@@global.userstat; +set global userstat=on; +flush table_statistics; +flush index_statistics; +SELECT MIN(b) FROM ( SELECT * FROM t1, t2, t3 WHERE d = b ) AS alias1 +WHERE SLEEP(0.1) OR c < 'p' OR b = ( SELECT MIN(b) FROM t2 ); +MIN(b) +NULL +# The following shows that t2 was indeed scanned with a full scan. +show table_statistics; +Table_schema Table_name Rows_read Rows_changed Rows_changed_x_#indexes +test t1 2 0 0 +test t2 3 0 0 +show index_statistics; +Table_schema Table_name Index_name Rows_read +test t2 b 1 +set global userstat=@tmp_mdev410; +DROP TABLE t1,t2,t3,t4; # return optimizer switch changed in the beginning of this test set optimizer_switch=@subselect_tmp; set @optimizer_switch_for_subselect_test=null; -- cgit v1.2.1