mirror of
https://github.com/MariaDB/server.git
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117388225c
Statements affect by this bug are all SQL statements that 1) prefixed with "EXPLAIN" 2) have a lower level join structure created for a union subquery. A bug in select_describe() passed an incorrect "result" object to mysql_explain_union(), resulting in unpredictable behaviour and out of context calls. Reviewed by: Oleksandr Byelkin, sanja@mariadb.com
501 lines
24 KiB
Text
501 lines
24 KiB
Text
drop table if exists t1;
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create table t1 (id int not null, str char(10), unique(str));
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explain select * from t1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 system NULL NULL NULL NULL 0 Const row not found
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insert into t1 values (1, null),(2, null),(3, "foo"),(4, "bar");
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select * from t1 where str is null;
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id str
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1 NULL
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2 NULL
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select * from t1 where str="foo";
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id str
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3 foo
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explain select * from t1 where str is null;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref str str 11 const 2 Using index condition
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explain select * from t1 where str="foo";
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 const str str 11 const 1
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explain select * from t1 ignore key (str) where str="foo";
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 4 Using where
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explain select * from t1 use key (str,str) where str="foo";
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 const str str 11 const 1
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explain select * from t1 use key (str,str,foo) where str="foo";
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ERROR 42000: Key 'foo' doesn't exist in table 't1'
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explain select * from t1 ignore key (str,str,foo) where str="foo";
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ERROR 42000: Key 'foo' doesn't exist in table 't1'
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drop table t1;
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explain select 1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used
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create table t1 (a int not null);
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explain select count(*) from t1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
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insert into t1 values(1);
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explain select count(*) from t1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
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insert into t1 values(1);
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explain select count(*) from t1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
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drop table t1;
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set names koi8r;
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create table <20><><EFBFBD> (<28><><EFBFBD>0 int, <20><><EFBFBD>1 int, key <20><><EFBFBD>0 (<28><><EFBFBD>0), key <20><><EFBFBD>01 (<28><><EFBFBD>0,<2C><><EFBFBD>1));
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insert into <20><><EFBFBD> (<28><><EFBFBD>0) values (1);
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insert into <20><><EFBFBD> (<28><><EFBFBD>0) values (2);
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explain select <20><><EFBFBD>0 from <20><><EFBFBD> where <20><><EFBFBD>0=1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE <09><><EFBFBD> ref <09><><EFBFBD>0,<2C><><EFBFBD>01 <09><><EFBFBD>0 5 const 1 Using index
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drop table <20><><EFBFBD>;
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set names latin1;
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select 3 into @v1;
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explain select 3 into @v1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used
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create table t1(f1 int, f2 int);
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insert into t1 values (1,1);
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create view v1 as select * from t1 where f1=1;
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explain extended select * from v1 where f2=1;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 system NULL NULL NULL NULL 1 100.00
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Warnings:
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Note 1003 select 1 AS `f1`,1 AS `f2` from dual where 1
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explain extended select * from t1 where 0;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
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Warnings:
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Note 1003 select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f2` AS `f2` from `test`.`t1` where 0
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explain extended select * from t1 where 1;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 system NULL NULL NULL NULL 1 100.00
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Warnings:
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Note 1003 select 1 AS `f1`,1 AS `f2` from dual where 1
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explain extended select * from t1 having 0;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible HAVING
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Warnings:
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Note 1003 select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f2` AS `f2` from `test`.`t1` having 0
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explain extended select * from t1 having 1;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 system NULL NULL NULL NULL 1 100.00
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Warnings:
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Note 1003 select 1 AS `f1`,1 AS `f2` from dual having 1
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drop view v1;
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drop table t1;
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CREATE TABLE t1(c INT);
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INSERT INTO t1 VALUES (),();
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CREATE TABLE t2 (b INT,
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KEY(b),KEY(b),KEY(b),KEY(b),KEY(b),
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KEY(b),KEY(b),KEY(b),KEY(b),KEY(b),
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KEY(b),KEY(b),KEY(b),KEY(b),KEY(b),
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KEY(b),KEY(b),KEY(b),KEY(b),KEY(b),
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KEY(b),KEY(b),KEY(b),KEY(b),KEY(b),
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KEY(b),KEY(b),KEY(b),KEY(b),KEY(b),
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KEY(b),KEY(b),KEY(b),KEY(b),KEY(b),
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KEY(b),KEY(b),KEY(b),KEY(b),KEY(b));
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Warnings:
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Note 1831 Duplicate index `b_2`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_3`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_4`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_5`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_6`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_7`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_8`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_9`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_10`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_11`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_12`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_13`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_14`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_15`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_16`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_17`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_18`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_19`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_20`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_21`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_22`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_23`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_24`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_25`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_26`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_27`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_28`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_29`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_30`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_31`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_32`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_33`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_34`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_35`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_36`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_37`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_38`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_39`. This is deprecated and will be disallowed in a future release
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Note 1831 Duplicate index `b_40`. This is deprecated and will be disallowed in a future release
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INSERT INTO t2 VALUES (),(),();
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EXPLAIN SELECT 1 FROM
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(SELECT 1 FROM t2,t1 WHERE b < c GROUP BY 1 LIMIT 1) AS d2;
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id select_type table type possible_keys key key_len ref rows Extra
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X X X X X X X X X
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X X X X X X X X X
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X X X X X X X X X Range checked for each record (index map: 0xFFFFFFFFFF)
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DROP TABLE t2;
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DROP TABLE t1;
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CREATE TABLE t1(a INT);
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CREATE TABLE t2(a INT);
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INSERT INTO t1 VALUES (1),(2);
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INSERT INTO t2 VALUES (1),(2);
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EXPLAIN EXTENDED SELECT 1
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FROM (SELECT COUNT(DISTINCT t1.a) FROM t1,t2 GROUP BY t1.a) AS s1;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY <derived2> ALL NULL NULL NULL NULL 4 100.00
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2 DERIVED t1 ALL NULL NULL NULL NULL 2 100.00 Using temporary; Using filesort
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2 DERIVED t2 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (flat, BNL join)
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Warnings:
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Note 1003 /* select#1 */ select 1 AS `1` from (/* select#2 */ select count(distinct `test`.`t1`.`a`) AS `COUNT(DISTINCT t1.a)` from `test`.`t1` join `test`.`t2` group by `test`.`t1`.`a`) `s1`
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EXPLAIN EXTENDED SELECT 1
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FROM (SELECT COUNT(DISTINCT t1.a) FROM t1,t2 GROUP BY t1.a) AS s1;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY <derived2> ALL NULL NULL NULL NULL 4 100.00
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2 DERIVED t1 ALL NULL NULL NULL NULL 2 100.00 Using temporary; Using filesort
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2 DERIVED t2 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (flat, BNL join)
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Warnings:
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Note 1003 /* select#1 */ select 1 AS `1` from (/* select#2 */ select count(distinct `test`.`t1`.`a`) AS `COUNT(DISTINCT t1.a)` from `test`.`t1` join `test`.`t2` group by `test`.`t1`.`a`) `s1`
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prepare s1 from
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'EXPLAIN EXTENDED SELECT 1
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FROM (SELECT COUNT(DISTINCT t1.a) FROM t1,t2 GROUP BY t1.a) AS s1';
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execute s1;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY <derived2> ALL NULL NULL NULL NULL 4 100.00
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2 DERIVED t1 ALL NULL NULL NULL NULL 2 100.00 Using temporary; Using filesort
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2 DERIVED t2 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (flat, BNL join)
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Warnings:
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Note 1003 /* select#1 */ select 1 AS `1` from (/* select#2 */ select count(distinct `test`.`t1`.`a`) AS `COUNT(DISTINCT t1.a)` from `test`.`t1` join `test`.`t2` group by `test`.`t1`.`a`) `s1`
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prepare s1 from
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'EXPLAIN EXTENDED SELECT 1
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FROM (SELECT COUNT(DISTINCT t1.a) FROM t1,t2 GROUP BY t1.a) AS s1';
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execute s1;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY <derived2> ALL NULL NULL NULL NULL 4 100.00
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2 DERIVED t1 ALL NULL NULL NULL NULL 2 100.00 Using temporary; Using filesort
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2 DERIVED t2 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (flat, BNL join)
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Warnings:
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Note 1003 /* select#1 */ select 1 AS `1` from (/* select#2 */ select count(distinct `test`.`t1`.`a`) AS `COUNT(DISTINCT t1.a)` from `test`.`t1` join `test`.`t2` group by `test`.`t1`.`a`) `s1`
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execute s1;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY <derived2> ALL NULL NULL NULL NULL 4 100.00
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2 DERIVED t1 ALL NULL NULL NULL NULL 2 100.00 Using temporary; Using filesort
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2 DERIVED t2 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (flat, BNL join)
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Warnings:
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Note 1003 /* select#1 */ select 1 AS `1` from (/* select#2 */ select count(distinct `test`.`t1`.`a`) AS `COUNT(DISTINCT t1.a)` from `test`.`t1` join `test`.`t2` group by `test`.`t1`.`a`) `s1`
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DROP TABLE t1,t2;
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CREATE TABLE t1 (a INT PRIMARY KEY);
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EXPLAIN EXTENDED SELECT COUNT(a) FROM t1 USE KEY(a);
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ERROR 42000: Key 'a' doesn't exist in table 't1'
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DROP TABLE t1;
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CREATE TABLE t1(a LONGTEXT);
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INSERT INTO t1 VALUES (repeat('a',@@global.max_allowed_packet));
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INSERT INTO t1 VALUES (repeat('b',@@global.max_allowed_packet));
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EXPLAIN SELECT DISTINCT 1 FROM t1,
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(SELECT DISTINCTROW a AS away FROM t1 GROUP BY a WITH ROLLUP) as d1
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WHERE t1.a = d1.a;
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ERROR 42S22: Unknown column 'd1.a' in 'where clause'
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DROP TABLE t1;
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#
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# Bug#48295:
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# explain extended crash with subquery and ONLY_FULL_GROUP_BY sql_mode
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#
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CREATE TABLE t1 (f1 INT not null);
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SELECT @@session.sql_mode INTO @old_sql_mode;
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SET SESSION sql_mode='ONLY_FULL_GROUP_BY';
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EXPLAIN EXTENDED SELECT 1 FROM t1
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WHERE f1 > ALL( SELECT t.f1 FROM t1,t1 AS t );
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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2 SUBQUERY t1 system NULL NULL NULL NULL 0 0.00 Const row not found
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2 SUBQUERY t system NULL NULL NULL NULL 0 0.00 Const row not found
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Warnings:
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Note 1003 /* select#1 */ select 1 AS `1` from `test`.`t1` where 0
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SET SESSION sql_mode=@old_sql_mode;
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DROP TABLE t1;
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End of 5.0 tests.
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#
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# Bug#37870: Usage of uninitialized value caused failed assertion.
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#
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create table t1 (dt datetime not null, t time not null);
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create table t2 (dt datetime not null);
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insert into t1 values ('2001-01-01 1:1:1', '1:1:1'),
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('2001-01-01 1:1:1', '1:1:1');
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insert into t2 values ('2001-01-01 1:1:1'), ('2001-01-01 1:1:1');
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SET @save_join_cache_level=@@join_cache_level;
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SET join_cache_level=0;
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flush tables;
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EXPLAIN SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN (SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.dt IS NULL );
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY OUTR ALL NULL NULL NULL NULL 2 Using where
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1 PRIMARY INNR ALL NULL NULL NULL NULL 2 Using where; FirstMatch(OUTR)
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flush tables;
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SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN (SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.dt IS NULL );
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dt
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flush tables;
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EXPLAIN SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN ( SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.t < '2005-11-13 7:41:31' );
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY OUTR ALL NULL NULL NULL NULL 2 Using where
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1 PRIMARY INNR ALL NULL NULL NULL NULL 2 Using where; FirstMatch(OUTR)
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flush tables;
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SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN ( SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.t < '2005-11-13 7:41:31' );
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dt
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2001-01-01 01:01:01
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2001-01-01 01:01:01
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SET join_cache_level=@save_join_cache_level;
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drop tables t1, t2;
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#
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# Bug#47669: Query showed by EXPLAIN EXTENDED gives different result from original query
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#
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CREATE TABLE t1 (c int);
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INSERT INTO t1 VALUES (NULL);
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CREATE TABLE t2 (d int);
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INSERT INTO t2 VALUES (NULL), (0);
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EXPLAIN EXTENDED SELECT (SELECT 1 FROM t2 WHERE d = c) FROM t1;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY t1 system NULL NULL NULL NULL 1 100.00
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2 SUBQUERY t2 ALL NULL NULL NULL NULL 2 100.00 Using where
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Warnings:
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Note 1276 Field or reference 'test.t1.c' of SELECT #2 was resolved in SELECT #1
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Note 1003 /* select#1 */ select (/* select#2 */ select 1 from `test`.`t2` where `test`.`t2`.`d` = NULL) AS `(SELECT 1 FROM t2 WHERE d = c)` from dual
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DROP TABLE t1, t2;
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#
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# Bug#30302: Tables that were optimized away are printed in the
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# EXPLAIN EXTENDED warning.
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#
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create table t1(f1 int);
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create table t2(f2 int);
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insert into t1 values(1);
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insert into t2 values(1),(2);
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explain extended select * from t1 where f1=1;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 system NULL NULL NULL NULL 1 100.00
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Warnings:
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Note 1003 select 1 AS `f1` from dual where 1
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explain extended select * from t1 join t2 on f1=f2 where f1=1;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 system NULL NULL NULL NULL 1 100.00
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1 SIMPLE t2 ALL NULL NULL NULL NULL 2 100.00 Using where
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Warnings:
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Note 1003 select 1 AS `f1`,`test`.`t2`.`f2` AS `f2` from `test`.`t2` where `test`.`t2`.`f2` = 1
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drop table t1,t2;
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#
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# Bug #48419: another explain crash..
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#
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CREATE TABLE t1 (a INT);
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CREATE TABLE t2 (b BLOB, KEY b(b(100)));
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INSERT INTO t2 VALUES ('1'), ('2'), ('3');
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FLUSH TABLES;
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EXPLAIN SELECT 1 FROM t1 WHERE a = (SELECT 1 FROM t1 t JOIN t2 WHERE b <= 1 AND t.a);
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table
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DROP TABLE t1, t2;
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#
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# Bug #48573: difference of index selection between rpm binary and
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# .tar.gz, windows vs linux..
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#
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CREATE TABLE t1(c1 INT, c2 INT, c4 INT, c5 INT, KEY(c2, c5), KEY(c2, c4, c5));
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INSERT INTO t1 VALUES(4, 1, 1, 1);
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INSERT INTO t1 VALUES(3, 1, 1, 1);
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INSERT INTO t1 VALUES(2, 1, 1, 1);
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INSERT INTO t1 VALUES(1, 1, 1, 1);
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INSERT INTO t1 VALUES(5, 2, 1, 1);
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INSERT INTO t1 VALUES(6, 2, 1, 1);
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INSERT INTO t1 VALUES(7, 3, 1, 1);
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INSERT INTO t1 VALUES(9, 3, 1, 1);
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INSERT INTO t1 VALUES(10, 4, 1, 1);
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INSERT INTO t1 VALUES(11, 4, 1, 1);
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EXPLAIN SELECT c1 FROM t1 WHERE c2 = 1 AND c4 = 1 AND c5 = 1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref c2,c2_2 c2 10 const,const 4 Using where
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DROP TABLE t1;
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#
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# Bug#56814 Explain + subselect + fulltext crashes server
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#
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CREATE TABLE t1(f1 VARCHAR(6) NOT NULL,
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FULLTEXT KEY(f1),UNIQUE(f1));
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INSERT INTO t1 VALUES ('test');
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EXPLAIN SELECT 1 FROM t1
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WHERE 1 > ALL((SELECT t1.f1 FROM t1 JOIN t1 a ON (MATCH(t1.f1) AGAINST (""))
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WHERE t1.f1 GROUP BY t1.f1));
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 system NULL NULL NULL NULL 1
|
||
2 SUBQUERY a system NULL NULL NULL NULL 1
|
||
2 SUBQUERY t1 fulltext f1_2,f1 f1 0 1 Using where
|
||
PREPARE stmt FROM
|
||
'EXPLAIN SELECT 1 FROM t1
|
||
WHERE 1 > ALL((SELECT t1.f1 FROM t1 RIGHT OUTER JOIN t1 a
|
||
ON (MATCH(t1.f1) AGAINST (""))
|
||
WHERE t1.f1 GROUP BY t1.f1))';
|
||
EXECUTE stmt;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 system NULL NULL NULL NULL 1
|
||
2 SUBQUERY a system NULL NULL NULL NULL 1
|
||
2 SUBQUERY t1 fulltext f1_2,f1 f1 0 1 Using where
|
||
EXECUTE stmt;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 system NULL NULL NULL NULL 1
|
||
2 SUBQUERY a system NULL NULL NULL NULL 1
|
||
2 SUBQUERY t1 fulltext f1_2,f1 f1 0 1 Using where
|
||
DEALLOCATE PREPARE stmt;
|
||
PREPARE stmt FROM
|
||
'EXPLAIN SELECT 1 FROM t1
|
||
WHERE 1 > ALL((SELECT t1.f1 FROM t1 JOIN t1 a
|
||
ON (MATCH(t1.f1) AGAINST (""))
|
||
WHERE t1.f1 GROUP BY t1.f1))';
|
||
EXECUTE stmt;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 system NULL NULL NULL NULL 1
|
||
2 SUBQUERY a system NULL NULL NULL NULL 1
|
||
2 SUBQUERY t1 fulltext f1_2,f1 f1 0 1 Using where
|
||
EXECUTE stmt;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 system NULL NULL NULL NULL 1
|
||
2 SUBQUERY a system NULL NULL NULL NULL 1
|
||
2 SUBQUERY t1 fulltext f1_2,f1 f1 0 1 Using where
|
||
DEALLOCATE PREPARE stmt;
|
||
DROP TABLE t1;
|
||
End of 5.1 tests.
|
||
#
|
||
# Bug#11829785 EXPLAIN EXTENDED CRASH WITH RIGHT OUTER JOIN, SUBQUERIES
|
||
#
|
||
CREATE TABLE t1(a INT);
|
||
INSERT INTO t1 VALUES (0), (0);
|
||
PREPARE s FROM
|
||
'EXPLAIN EXTENDED
|
||
SELECT SUBSTRING(1, (SELECT 1 FROM t1 a1 RIGHT OUTER JOIN t1 ON 0)) AS d
|
||
FROM t1 WHERE 0 > ANY (SELECT @a FROM t1)';
|
||
EXECUTE s;
|
||
ERROR 21000: Subquery returns more than 1 row
|
||
DEALLOCATE PREPARE s;
|
||
DROP TABLE t1;
|
||
#
|
||
# Bug#776295: EXPLAIN EXTENDED with always false multiple equality
|
||
# in the WHERE condition of a derived table
|
||
#
|
||
CREATE TABLE t1 (a int) ;
|
||
CREATE TABLE t2 (a int) ;
|
||
INSERT INTO t2 VALUES (8);
|
||
set @tmp_optimizer_switch=@@optimizer_switch;
|
||
set optimizer_switch='derived_merge=off,derived_with_keys=off';
|
||
EXPLAIN EXTENDED
|
||
SELECT * FROM ( SELECT t1.a FROM t1,t2 WHERE t2.a = t1.a ) AS t;
|
||
id select_type table type possible_keys key key_len ref rows filtered Extra
|
||
1 PRIMARY <derived2> system NULL NULL NULL NULL 0 0.00 Const row not found
|
||
2 DERIVED NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table
|
||
Warnings:
|
||
Note 1003 /* select#1 */ select NULL AS `a` from (/* select#2 */ select NULL AS `a` from `test`.`t1` where 0) `t`
|
||
set optimizer_switch=@tmp_optimizer_switch;
|
||
DROP TABLE t1,t2;
|
||
#
|
||
# MDEV-7215: EXPLAIN REPLACE produces an error:
|
||
# Column count doesn't match value count
|
||
#
|
||
create table t1 (a int);
|
||
insert into t1 values (1);
|
||
create table t2 (b int, c int);
|
||
replace into t2 select 100, (select a from t1);
|
||
explain replace into t2 select 100, (select a from t1);
|
||
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 t1 system NULL NULL NULL NULL 1
|
||
drop table t1, t2;
|
||
# End of 10.1 tests
|
||
#
|
||
# End of 10.2 test
|
||
#
|
||
#
|
||
# MDEV-25564: Server crashed on running some EXPLAIN statements
|
||
#
|
||
EXPLAIN (SELECT 1,3) UNION (SELECT 2,1) ORDER BY (SELECT 2);
|
||
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 UNION NULL NULL NULL NULL NULL NULL NULL No tables used
|
||
NULL UNION RESULT <union1,2> ALL NULL NULL NULL NULL NULL Using filesort
|
||
Warnings:
|
||
Note 1249 Select 3 was reduced during optimization
|
||
#
|
||
# MDEV-23160: SIGSEGV in Explain_node::print_explain_for_children on UNION SELECT
|
||
#
|
||
CREATE TABLE t1 (a INT);
|
||
INSERT INTO t1 VALUES (1),(2),(3);
|
||
EXPLAIN
|
||
SELECT *
|
||
FROM t1
|
||
WHERE
|
||
a IN (SELECT a FROM t1
|
||
UNION
|
||
SELECT a FROM t1 ORDER BY (SELECT a))
|
||
UNION
|
||
SELECT * FROM t1 ORDER BY (SELECT a);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 Using where
|
||
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 3 Using where
|
||
3 DEPENDENT UNION t1 ALL NULL NULL NULL NULL 3 Using where
|
||
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
|
||
5 UNION t1 ALL NULL NULL NULL NULL 3
|
||
NULL UNION RESULT <union1,5> ALL NULL NULL NULL NULL NULL Using filesort
|
||
6 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL No tables used
|
||
drop table t1;
|
||
explain
|
||
VALUES ( (VALUES (2))) UNION VALUES ( (SELECT 3));
|
||
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
|
||
5 SUBQUERY <derived2> ALL NULL NULL NULL NULL 2
|
||
2 DERIVED NULL NULL NULL NULL NULL NULL NULL No tables used
|
||
3 UNION NULL NULL NULL NULL NULL NULL NULL No tables used
|
||
NULL UNION RESULT <union1,3> ALL NULL NULL NULL NULL NULL
|
||
Warnings:
|
||
Note 1249 Select 4 was reduced during optimization
|
||
#
|
||
# End of 10.4 tests
|
||
#
|
||
CREATE TABLE t1 (a INT);
|
||
INSERT INTO t1 VALUES (1),(2);
|
||
CREATE TABLE t2 (b INT);
|
||
INSERT INTO t2 VALUES (3),(4);
|
||
EXPLAIN SELECT * FROM t1, t2 WHERE t2.b IN (SELECT 5 UNION SELECT 6);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
|
||
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
|
||
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL No tables used
|
||
3 DEPENDENT UNION NULL NULL NULL NULL NULL NULL NULL No tables used
|
||
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
|
||
EXPLAIN DELETE t2 FROM t1, t2 WHERE t2.b IN (SELECT 5 UNION SELECT 6);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
|
||
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where
|
||
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL No tables used
|
||
3 DEPENDENT UNION NULL NULL NULL NULL NULL NULL NULL No tables used
|
||
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
|
||
prepare stmt from "EXPLAIN DELETE t2 FROM t1, t2 WHERE t2.b IN (SELECT 5 UNION SELECT 6)";
|
||
execute stmt;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
|
||
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where
|
||
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL No tables used
|
||
3 DEPENDENT UNION NULL NULL NULL NULL NULL NULL NULL No tables used
|
||
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
|
||
execute stmt;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
|
||
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where
|
||
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL No tables used
|
||
3 DEPENDENT UNION NULL NULL NULL NULL NULL NULL NULL No tables used
|
||
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
|
||
DROP TABLE t1, t2;
|
||
#
|
||
# End of 10.5 tests
|
||
#
|