GIF89a;
Mini Shell
Mini Shell
set optimizer_switch='semijoin=on,materialization=on,firstmatch=on,loosescan=on,index_condition_pushdown=on,mrr=on,mrr_cost_based=off';
set optimizer_trace_max_mem_size=1048576;
SET end_markers_in_json=on;
SET optimizer_trace="enabled=on,one_line=off";
#
# BUG#12430646 - SEL_ARG::LEFT AND RIGHT POINTERS INCORRECTLY
# USED. CRASHES OPTIMIZER TRACING
#
CREATE TABLE t1 (
a INT,
b CHAR(2),
c INT,
d INT,
KEY (c),
KEY (d,a,b(2)),
KEY (b(1))
);
INSERT INTO t1 VALUES (NULL, 'a', 1, 2), (NULL, 'a', 1, 2),
(1, 'a', 1, 2), (1, 'a', 1, 2);
CREATE TABLE t2 (
a INT,
c INT,
e INT,
KEY (e)
);
INSERT INTO t2 VALUES (1, 1, NULL), (1, 1, NULL);
SELECT 1
FROM t1, t2
WHERE t1.d <> '1' AND t1.b > '1'
AND t1.a = t2.a AND t1.c = t2.c;
1
1
1
1
1
DROP TABLE t1, t2;
#
# BUG#12595210 - JSON SYNTAX ERROR ASSERT ON WHERE FIELD NOT IN SUBQUERY
#
CREATE TABLE t1 (
pk INT NOT NULL AUTO_INCREMENT,
col_int_key INT DEFAULT NULL,
col_varchar_key VARCHAR(1) DEFAULT NULL,
PRIMARY KEY (pk)
) ENGINE=InnoDB;
CREATE TABLE t2 (
pk INT NOT NULL AUTO_INCREMENT,
col_int_key INT DEFAULT NULL,
col_varchar_key VARCHAR(1) DEFAULT NULL,
col_varchar_nokey VARCHAR(1) DEFAULT NULL,
PRIMARY KEY (pk)
) ENGINE=InnoDB;
CREATE TABLE t3 (
pk INT NOT NULL AUTO_INCREMENT,
col_int_key INT DEFAULT NULL,
col_varchar_key VARCHAR(1) DEFAULT NULL,
col_varchar_nokey VARCHAR(1) DEFAULT NULL,
PRIMARY KEY (pk)
) ENGINE=InnoDB;
CREATE TABLE t4 (
pk INT NOT NULL AUTO_INCREMENT,
col_int_key INT DEFAULT NULL,
col_varchar_key VARCHAR(1) DEFAULT NULL,
PRIMARY KEY (pk)
) ENGINE=InnoDB;
CREATE VIEW view_t4 AS SELECT * FROM t4;
CREATE TABLE where_subselect_19379 SELECT
(
SELECT SUM(sq1_alias1.pk) AS sq1_field1
FROM view_t4 AS sq1_alias1
INNER JOIN t1 AS sq1_alias2 ON (sq1_alias2.col_varchar_key =
sq1_alias1.col_varchar_key )
) AS field1,
alias1.col_varchar_nokey AS field2
FROM (t2 AS alias1
LEFT JOIN ( t2 AS alias2
LEFT OUTER JOIN t2 AS alias3 ON (alias3.col_varchar_nokey =
alias2.col_varchar_key )
) ON (alias3.col_varchar_key = alias2.col_varchar_key)
)
WHERE ( alias2.col_varchar_key IN (
SELECT sq2_alias1.col_varchar_nokey AS sq2_field1
FROM t3 AS sq2_alias1
WHERE sq2_alias1.col_varchar_nokey <= alias1.col_varchar_key
)
);
SELECT * FROM where_subselect_19379 WHERE (field1, field2) NOT IN
(SELECT
(
SELECT SUM(sq1_alias1.pk) AS sq1_field1
FROM view_t4 AS sq1_alias1
INNER JOIN t1 AS sq1_alias2 ON (sq1_alias2.col_varchar_key =
sq1_alias1.col_varchar_key )
) AS field1,
alias1.col_varchar_nokey AS field2
FROM (t2 AS alias1
LEFT JOIN ( t2 AS alias2
LEFT OUTER JOIN t2 AS alias3 ON (alias3.col_varchar_nokey =
alias2.col_varchar_key )
) ON (alias3.col_varchar_key = alias2.col_varchar_key)
)
WHERE ( alias2.col_varchar_key IN (
SELECT sq2_alias1.col_varchar_nokey AS sq2_field1
FROM t3 AS sq2_alias1
WHERE sq2_alias1.col_varchar_nokey <= alias1.col_varchar_key
)
));
field1 field2
select * from information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * FROM where_subselect_19379 WHERE (field1, field2) NOT IN
(SELECT
(
SELECT SUM(sq1_alias1.pk) AS sq1_field1
FROM view_t4 AS sq1_alias1
INNER JOIN t1 AS sq1_alias2 ON (sq1_alias2.col_varchar_key =
sq1_alias1.col_varchar_key )
) AS field1,
alias1.col_varchar_nokey AS field2
FROM (t2 AS alias1
LEFT JOIN ( t2 AS alias2
LEFT OUTER JOIN t2 AS alias3 ON (alias3.col_varchar_nokey =
alias2.col_varchar_key )
) ON (alias3.col_varchar_key = alias2.col_varchar_key)
)
WHERE ( alias2.col_varchar_key IN (
SELECT sq2_alias1.col_varchar_nokey AS sq2_field1
FROM t3 AS sq2_alias1
WHERE sq2_alias1.col_varchar_nokey <= alias1.col_varchar_key
)
)) {
"steps": [
{
"view": {
"database": "test",
"view": "sq1_alias1",
"in_select#": 1,
"select#": 5,
"merged": true
} /* view */
},
{
"join_preparation": {
"select#": 1,
"steps": [
{
"join_preparation": {
"select#": 2,
"steps": [
{
"join_preparation": {
"select#": 3,
"steps": [
{
"expanded_query": "/* select#3 */ select sum(`t4`.`pk`) AS `sq1_field1` from ((`t4`) join `t1` `sq1_alias2` on((`sq1_alias2`.`col_varchar_key` = `t4`.`col_varchar_key`)))"
}
] /* steps */
} /* join_preparation */
},
{
"join_preparation": {
"select#": 4,
"steps": [
{
"expanded_query": "/* select#4 */ select `sq2_alias1`.`col_varchar_nokey` AS `sq2_field1` from `t3` `sq2_alias1` where (`sq2_alias1`.`col_varchar_nokey` <= `alias1`.`col_varchar_key`)"
},
{
"transformation": {
"select#": 4,
"from": "IN (SELECT)",
"to": "semijoin",
"chosen": true
} /* transformation */
}
] /* steps */
} /* join_preparation */
},
{
"expanded_query": "/* select#2 */ select (/* select#3 */ select sum(`t4`.`pk`) AS `sq1_field1` from ((`t4`) join `t1` `sq1_alias2` on((`sq1_alias2`.`col_varchar_key` = `t4`.`col_varchar_key`)))) AS `field1`,`alias1`.`col_varchar_nokey` AS `field2` from (`t2` `alias1` left join (`t2` `alias2` left join `t2` `alias3` on((`alias3`.`col_varchar_nokey` = `alias2`.`col_varchar_key`))) on((`alias3`.`col_varchar_key` = `alias2`.`col_varchar_key`))) where `alias2`.`col_varchar_key` in (/* select#4 */ select `sq2_alias1`.`col_varchar_nokey` AS `sq2_field1` from `t3` `sq2_alias1` where (`sq2_alias1`.`col_varchar_nokey` <= `alias1`.`col_varchar_key`))"
},
{
"transformation": {
"select#": 2,
"from": "IN (SELECT)",
"to": "semijoin",
"chosen": false
} /* transformation */
},
{
"transformation": {
"select#": 2,
"from": "IN (SELECT)",
"to": "EXISTS (CORRELATED SELECT)",
"chosen": true,
"evaluating_constant_where_conditions": [
] /* evaluating_constant_where_conditions */,
"evaluating_constant_having_conditions": [
] /* evaluating_constant_having_conditions */
} /* transformation */
}
] /* steps */
} /* join_preparation */
},
{
"expanded_query": "/* select#1 */ select `where_subselect_19379`.`field1` AS `field1`,`where_subselect_19379`.`field2` AS `field2` from `where_subselect_19379` where (not(<in_optimizer>((`where_subselect_19379`.`field1`,`where_subselect_19379`.`field2`),<exists>(/* select#2 */ select (/* select#3 */ select sum(`t4`.`pk`) AS `sq1_field1` from ((`t4`) join `t1` `sq1_alias2` on((`sq1_alias2`.`col_varchar_key` = `t4`.`col_varchar_key`)))) AS `field1`,`alias1`.`col_varchar_nokey` AS `field2` from (`t2` `alias1` left join (`t2` `alias2` left join `t2` `alias3` on((`alias3`.`col_varchar_nokey` = `alias2`.`col_varchar_key`))) on((`alias3`.`col_varchar_key` = `alias2`.`col_varchar_key`))) where (`alias2`.`col_varchar_key` in (/* select#4 */ select `sq2_alias1`.`col_varchar_nokey` AS `sq2_field1` from `t3` `sq2_alias1` where (`sq2_alias1`.`col_varchar_nokey` <= `alias1`.`col_varchar_key`)) and <if>(outer_field_is_not_null, ((<cache>(`where_subselect_19379`.`field1`) = (/* select#3 */ select sum(`t4`.`pk`) AS `sq1_field1` from ((`t4`) join `t1` `sq1_alias2` on((`sq1_alias2`.`col_varchar_key` = `t4`.`col_varchar_key`))))) or isnull((/* select#3 */ select sum(`t4`.`pk`) AS `sq1_field1` from ((`t4`) join `t1` `sq1_alias2` on((`sq1_alias2`.`col_varchar_key` = `t4`.`col_varchar_key`)))))), true) and <if>(outer_field_is_not_null, ((<cache>(`where_subselect_19379`.`field2`) = `alias1`.`col_varchar_nokey`) or isnull(`alias1`.`col_varchar_nokey`)), true)) having (<if>(outer_field_is_not_null, <is_not_null_test>((/* select#3 */ select sum(`t4`.`pk`) AS `sq1_field1` from ((`t4`) join `t1` `sq1_alias2` on((`sq1_alias2`.`col_varchar_key` = `t4`.`col_varchar_key`))))), true) and <if>(outer_field_is_not_null, <is_not_null_test>(`alias1`.`col_varchar_nokey`), true))))))"
}
] /* steps */
} /* join_preparation */
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(not(<in_optimizer>((`where_subselect_19379`.`field1`,`where_subselect_19379`.`field2`),<exists>(/* select#2 */ select (/* select#3 */ select sum(`t4`.`pk`) AS `sq1_field1` from ((`t4`) join `t1` `sq1_alias2` on((`sq1_alias2`.`col_varchar_key` = `t4`.`col_varchar_key`)))) AS `field1`,`alias1`.`col_varchar_nokey` AS `field2` from (`t2` `alias1` left join (`t2` `alias2` left join `t2` `alias3` on((`alias3`.`col_varchar_nokey` = `alias2`.`col_varchar_key`))) on((`alias3`.`col_varchar_key` = `alias2`.`col_varchar_key`))) where (`alias2`.`col_varchar_key` in (/* select#4 */ select `sq2_alias1`.`col_varchar_nokey` AS `sq2_field1` from `t3` `sq2_alias1` where (`sq2_alias1`.`col_varchar_nokey` <= `alias1`.`col_varchar_key`)) and <if>(outer_field_is_not_null, ((<cache>(`where_subselect_19379`.`field1`) = (/* select#3 */ select sum(`t4`.`pk`) AS `sq1_field1` from ((`t4`) join `t1` `sq1_alias2` on((`sq1_alias2`.`col_varchar_key` = `t4`.`col_varchar_key`))))) or isnull((/* select#3 */ select sum(`t4`.`pk`) AS `sq1_field1` from ((`t4`) join `t1` `sq1_alias2` on((`sq1_alias2`.`col_varchar_key` = `t4`.`col_varchar_key`)))))), true) and <if>(outer_field_is_not_null, ((<cache>(`where_subselect_19379`.`field2`) = `alias1`.`col_varchar_nokey`) or isnull(`alias1`.`col_varchar_nokey`)), true)) having (<if>(outer_field_is_not_null, <is_not_null_test>((/* select#3 */ select sum(`t4`.`pk`) AS `sq1_field1` from ((`t4`) join `t1` `sq1_alias2` on((`sq1_alias2`.`col_varchar_key` = `t4`.`col_varchar_key`))))), true) and <if>(outer_field_is_not_null, <is_not_null_test>(`alias1`.`col_varchar_nokey`), true))))))",
"steps": [
{
"transformation": "equality_propagation",
"subselect_evaluation": [
] /* subselect_evaluation */,
"resulting_condition": "(not(<in_optimizer>((`where_subselect_19379`.`field1`,`where_subselect_19379`.`field2`),<exists>(/* select#2 */ select (/* select#3 */ select sum(`t4`.`pk`) AS `sq1_field1` from ((`t4`) join `t1` `sq1_alias2` on((`sq1_alias2`.`col_varchar_key` = `t4`.`col_varchar_key`)))) AS `field1`,`alias1`.`col_varchar_nokey` AS `field2` from (`t2` `alias1` left join (`t2` `alias2` left join `t2` `alias3` on((`alias3`.`col_varchar_nokey` = `alias2`.`col_varchar_key`))) on((`alias3`.`col_varchar_key` = `alias2`.`col_varchar_key`))) where (`alias2`.`col_varchar_key` in (/* select#4 */ select `sq2_alias1`.`col_varchar_nokey` AS `sq2_field1` from `t3` `sq2_alias1` where (`sq2_alias1`.`col_varchar_nokey` <= `alias1`.`col_varchar_key`)) and <if>(outer_field_is_not_null, ((<cache>(`where_subselect_19379`.`field1`) = (/* select#3 */ select sum(`t4`.`pk`) AS `sq1_field1` from ((`t4`) join `t1` `sq1_alias2` on((`sq1_alias2`.`col_varchar_key` = `t4`.`col_varchar_key`))))) or isnull((/* select#3 */ select sum(`t4`.`pk`) AS `sq1_field1` from ((`t4`) join `t1` `sq1_alias2` on((`sq1_alias2`.`col_varchar_key` = `t4`.`col_varchar_key`)))))), true) and <if>(outer_field_is_not_null, ((<cache>(`where_subselect_19379`.`field2`) = `alias1`.`col_varchar_nokey`) or isnull(`alias1`.`col_varchar_nokey`)), true)) having (<if>(outer_field_is_not_null, <is_not_null_test>((/* select#3 */ select sum(`t4`.`pk`) AS `sq1_field1` from ((`t4`) join `t1` `sq1_alias2` on((`sq1_alias2`.`col_varchar_key` = `t4`.`col_varchar_key`))))), true) and <if>(outer_field_is_not_null, <is_not_null_test>(`alias1`.`col_varchar_nokey`), true))))))"
},
{
"transformation": "constant_propagation",
"subselect_evaluation": [
] /* subselect_evaluation */,
"resulting_condition": "(not(<in_optimizer>((`where_subselect_19379`.`field1`,`where_subselect_19379`.`field2`),<exists>(/* select#2 */ select (/* select#3 */ select sum(`t4`.`pk`) AS `sq1_field1` from ((`t4`) join `t1` `sq1_alias2` on((`sq1_alias2`.`col_varchar_key` = `t4`.`col_varchar_key`)))) AS `field1`,`alias1`.`col_varchar_nokey` AS `field2` from (`t2` `alias1` left join (`t2` `alias2` left join `t2` `alias3` on((`alias3`.`col_varchar_nokey` = `alias2`.`col_varchar_key`))) on((`alias3`.`col_varchar_key` = `alias2`.`col_varchar_key`))) where (`alias2`.`col_varchar_key` in (/* select#4 */ select `sq2_alias1`.`col_varchar_nokey` AS `sq2_field1` from `t3` `sq2_alias1` where (`sq2_alias1`.`col_varchar_nokey` <= `alias1`.`col_varchar_key`)) and <if>(outer_field_is_not_null, ((<cache>(`where_subselect_19379`.`field1`) = (/* select#3 */ select sum(`t4`.`pk`) AS `sq1_field1` from ((`t4`) join `t1` `sq1_alias2` on((`sq1_alias2`.`col_varchar_key` = `t4`.`col_varchar_key`))))) or isnull((/* select#3 */ select sum(`t4`.`pk`) AS `sq1_field1` from ((`t4`) join `t1` `sq1_alias2` on((`sq1_alias2`.`col_varchar_key` = `t4`.`col_varchar_key`)))))), true) and <if>(outer_field_is_not_null, ((<cache>(`where_subselect_19379`.`field2`) = `alias1`.`col_varchar_nokey`) or isnull(`alias1`.`col_varchar_nokey`)), true)) having (<if>(outer_field_is_not_null, <is_not_null_test>((/* select#3 */ select sum(`t4`.`pk`) AS `sq1_field1` from ((`t4`) join `t1` `sq1_alias2` on((`sq1_alias2`.`col_varchar_key` = `t4`.`col_varchar_key`))))), true) and <if>(outer_field_is_not_null, <is_not_null_test>(`alias1`.`col_varchar_nokey`), true))))))"
},
{
"transformation": "trivial_condition_removal",
"subselect_evaluation": [
] /* subselect_evaluation */,
"resulting_condition": "(not(<in_optimizer>((`where_subselect_19379`.`field1`,`where_subselect_19379`.`field2`),<exists>(/* select#2 */ select (/* select#3 */ select sum(`t4`.`pk`) AS `sq1_field1` from ((`t4`) join `t1` `sq1_alias2` on((`sq1_alias2`.`col_varchar_key` = `t4`.`col_varchar_key`)))) AS `field1`,`alias1`.`col_varchar_nokey` AS `field2` from (`t2` `alias1` left join (`t2` `alias2` left join `t2` `alias3` on((`alias3`.`col_varchar_nokey` = `alias2`.`col_varchar_key`))) on((`alias3`.`col_varchar_key` = `alias2`.`col_varchar_key`))) where (`alias2`.`col_varchar_key` in (/* select#4 */ select `sq2_alias1`.`col_varchar_nokey` AS `sq2_field1` from `t3` `sq2_alias1` where (`sq2_alias1`.`col_varchar_nokey` <= `alias1`.`col_varchar_key`)) and <if>(outer_field_is_not_null, ((<cache>(`where_subselect_19379`.`field1`) = (/* select#3 */ select sum(`t4`.`pk`) AS `sq1_field1` from ((`t4`) join `t1` `sq1_alias2` on((`sq1_alias2`.`col_varchar_key` = `t4`.`col_varchar_key`))))) or isnull((/* select#3 */ select sum(`t4`.`pk`) AS `sq1_field1` from ((`t4`) join `t1` `sq1_alias2` on((`sq1_alias2`.`col_varchar_key` = `t4`.`col_varchar_key`)))))), true) and <if>(outer_field_is_not_null, ((<cache>(`where_subselect_19379`.`field2`) = `alias1`.`col_varchar_nokey`) or isnull(`alias1`.`col_varchar_nokey`)), true)) having (<if>(outer_field_is_not_null, <is_not_null_test>((/* select#3 */ select sum(`t4`.`pk`) AS `sq1_field1` from ((`t4`) join `t1` `sq1_alias2` on((`sq1_alias2`.`col_varchar_key` = `t4`.`col_varchar_key`))))), true) and <if>(outer_field_is_not_null, <is_not_null_test>(`alias1`.`col_varchar_nokey`), true))))))"
}
] /* steps */
} /* condition_processing */
},
{
"table_dependencies": [
{
"table": "`where_subselect_19379`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
] /* depends_on_map_bits */
}
] /* table_dependencies */
},
{
"ref_optimizer_key_uses": [
] /* ref_optimizer_key_uses */
},
{
"rows_estimation": [
{
"table": "`where_subselect_19379`",
"rows": 1,
"cost": 1,
"table_type": "system",
"empty": true
}
] /* rows_estimation */
}
] /* steps */,
"empty_result": {
"cause": "no matching row in const table"
} /* empty_result */
} /* join_optimization */
},
{
"join_execution": {
"select#": 1,
"steps": [
] /* steps */
} /* join_execution */
}
] /* steps */
} 0 0
drop table t1,t2,t3,t4,where_subselect_19379;
drop view view_t4;
#
# BUG#12607524 JSON PARSE ERROR ON SELECT ... FROM ... WHERE .. IN (SUBQUERY)
#
CREATE TABLE t1 (
col_int_key int(11) DEFAULT NULL,
col_varchar_key varchar(1) DEFAULT NULL,
KEY col_int_key (col_int_key),
KEY col_varchar_key (col_varchar_key,col_int_key)
) ENGINE=MyISAM;
INSERT INTO t1 VALUES (8,'g');
CREATE TABLE t2 (
col_int_key int(11) DEFAULT NULL,
col_varchar_key varchar(1) DEFAULT NULL,
KEY col_int_key (col_int_key),
KEY col_varchar_key (col_varchar_key,col_int_key)
) ENGINE=MyISAM;
INSERT INTO t2 VALUES (7,'x');
CREATE TABLE where_subselect_19033
SELECT
( SELECT col_int_key FROM t2 ) as field1
FROM t1
;
SELECT * FROM where_subselect_19033;
field1
7
SELECT field1
FROM where_subselect_19033
WHERE field1 IN
( SELECT
( SELECT col_int_key FROM t2 )
FROM t1
)
;
field1
7
SELECT * FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT field1
FROM where_subselect_19033
WHERE field1 IN
( SELECT
( SELECT col_int_key FROM t2 )
FROM t1
) {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"join_preparation": {
"select#": 2,
"steps": [
{
"join_preparation": {
"select#": 3,
"steps": [
{
"expanded_query": "/* select#3 */ select `t2`.`col_int_key` from `t2`"
}
] /* steps */
} /* join_preparation */
},
{
"expanded_query": "/* select#2 */ select (/* select#3 */ select `t2`.`col_int_key` from `t2`) from `t1`"
},
{
"transformation": {
"select#": 2,
"from": "IN (SELECT)",
"to": "semijoin",
"chosen": true
} /* transformation */
}
] /* steps */
} /* join_preparation */
},
{
"expanded_query": "/* select#1 */ select `where_subselect_19033`.`field1` AS `field1` from `where_subselect_19033` where `where_subselect_19033`.`field1` in (/* select#2 */ select (/* select#3 */ select `t2`.`col_int_key` from `t2`) from `t1`)"
}
] /* steps */
} /* join_preparation */
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"transformation": {
"select#": 2,
"from": "IN (SELECT)",
"to": "semijoin",
"chosen": true,
"evaluating_constant_semijoin_conditions": [
{
"subselect_execution": {
"select#": 3,
"steps": [
{
"join_optimization": {
"select#": 3,
"steps": [
{
"table_dependencies": [
{
"table": "`t2`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
] /* depends_on_map_bits */
}
] /* table_dependencies */
},
{
"rows_estimation": [
{
"table": "`t2`",
"rows": 1,
"cost": 1,
"table_type": "system",
"empty": false
}
] /* rows_estimation */
},
{
"attaching_conditions_to_tables": {
"original_condition": null,
"attached_conditions_computation": [
] /* attached_conditions_computation */,
"attached_conditions_summary": [
] /* attached_conditions_summary */
} /* attaching_conditions_to_tables */
},
{
"refine_plan": [
] /* refine_plan */
}
] /* steps */
} /* join_optimization */
},
{
"join_execution": {
"select#": 3,
"steps": [
] /* steps */
} /* join_execution */
}
] /* steps */
} /* subselect_execution */
},
{
"subselect_execution": {
"select#": 3,
"steps": [
] /* steps */
} /* subselect_execution */
}
] /* evaluating_constant_semijoin_conditions */
} /* transformation */
},
{
"transformations_to_nested_joins": {
"transformations": [
"semijoin"
] /* transformations */,
"expanded_query": "/* select#1 */ select `where_subselect_19033`.`field1` AS `field1` from `where_subselect_19033` semi join (`t1`) where (1 and (`where_subselect_19033`.`field1` = 7))"
} /* transformations_to_nested_joins */
},
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(1 and (`where_subselect_19033`.`field1` = 7))",
"steps": [
{
"transformation": "equality_propagation",
"subselect_evaluation": [
] /* subselect_evaluation */,
"resulting_condition": "(1 and multiple equal(7, `where_subselect_19033`.`field1`))"
},
{
"transformation": "constant_propagation",
"resulting_condition": "(1 and multiple equal(7, `where_subselect_19033`.`field1`))"
},
{
"transformation": "trivial_condition_removal",
"resulting_condition": "multiple equal(7, `where_subselect_19033`.`field1`)"
}
] /* steps */
} /* condition_processing */
},
{
"table_dependencies": [
{
"table": "`where_subselect_19033`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
] /* depends_on_map_bits */
},
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 1,
"depends_on_map_bits": [
] /* depends_on_map_bits */
}
] /* table_dependencies */
},
{
"ref_optimizer_key_uses": [
] /* ref_optimizer_key_uses */
},
{
"pulled_out_semijoin_tables": [
] /* pulled_out_semijoin_tables */
},
{
"rows_estimation": [
{
"table": "`where_subselect_19033`",
"rows": 1,
"cost": 1,
"table_type": "system",
"empty": false
},
{
"table": "`t1`",
"table_scan": {
"rows": 1,
"cost": 2
} /* table_scan */
}
] /* rows_estimation */
},
{
"execution_plan_for_potential_materialization": {
"steps": [
{
"considered_execution_plans": [
{
"plan_prefix": [
] /* plan_prefix */,
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "scan",
"rows": 1,
"cost": 2.2049,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 2.2049,
"rows_for_plan": 1,
"chosen": true
}
] /* considered_execution_plans */
}
] /* steps */
} /* execution_plan_for_potential_materialization */
},
{
"considered_execution_plans": [
{
"plan_prefix": [
"`where_subselect_19033`"
] /* plan_prefix */,
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "scan",
"rows": 1,
"cost": 2.2049,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 2.2049,
"rows_for_plan": 1,
"semijoin_strategy_choice": [
{
"strategy": "FirstMatch",
"recalculate_access_paths_and_cost": {
"tables": [
] /* tables */
} /* recalculate_access_paths_and_cost */,
"cost": 2.2049,
"rows": 1,
"chosen": true
},
{
"strategy": "MaterializeLookup",
"cost": 4.6049,
"rows": 1,
"duplicate_tables_left": false,
"chosen": false
},
{
"strategy": "DuplicatesWeedout",
"cost": 4.6049,
"rows": 1,
"duplicate_tables_left": false,
"chosen": false
}
] /* semijoin_strategy_choice */,
"chosen": true
},
{
"final_semijoin_strategy": "FirstMatch",
"recalculate_access_paths_and_cost": {
"tables": [
] /* tables */
} /* recalculate_access_paths_and_cost */
}
] /* considered_execution_plans */
},
{
"condition_on_constant_tables": "1",
"condition_value": true
},
{
"attaching_conditions_to_tables": {
"original_condition": "1",
"attached_conditions_computation": [
] /* attached_conditions_computation */,
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": null
}
] /* attached_conditions_summary */
} /* attaching_conditions_to_tables */
},
{
"refine_plan": [
{
"table": "`t1`",
"access_type": "index_scan"
}
] /* refine_plan */
}
] /* steps */
} /* join_optimization */
},
{
"join_execution": {
"select#": 1,
"steps": [
] /* steps */
} /* join_execution */
}
] /* steps */
} 0 0
DROP TABLE where_subselect_19033,t1,t2;
# BUG#12612201 - SEGFAULT IN
# SUBSELECT_UNIQUESUBQUERY_ENGINE::PRINT WITH OPTIMIZER TRACE
CREATE TABLE t1 (
col_int_key int(11) DEFAULT NULL,
col_varchar_key varchar(1) DEFAULT NULL,
col_varchar_nokey varchar(1) DEFAULT NULL
);
CREATE TABLE t2 (
pk int(11) NOT NULL AUTO_INCREMENT,
col_int_key int(11) DEFAULT NULL,
col_varchar_key varchar(1) DEFAULT NULL,
col_varchar_nokey varchar(1) DEFAULT NULL,
PRIMARY KEY (pk)
);
INSERT INTO t2 VALUES (1,4,'v','v'),(20,5,'r','r');
CREATE TABLE t3 (
col_int_key int(11) DEFAULT NULL,
col_varchar_key varchar(1) DEFAULT NULL,
col_varchar_nokey varchar(1) DEFAULT NULL
);
INSERT INTO t3 VALUES (NULL,'j','j'),(8,'c','c');
CREATE TABLE where_updatedelete_20769 select count( alias2 . col_varchar_key ) as field1
from (
(select sq1_alias1 . *
from ( t3 as sq1_alias1
straight_join t1 as sq1_alias2
on (sq1_alias2 . col_varchar_key = sq1_alias1 . col_varchar_key)
)
where sq1_alias1 . col_int_key in (
select c_sq1_alias1 . pk as c_sq1_field1
from t2 as c_sq1_alias1
)
) as alias1
left outer join t1 as alias2
on (alias2 . col_varchar_key = alias1 . col_varchar_key )
)
where ( alias2 . col_varchar_key in (
select sq2_alias1 . col_varchar_nokey as sq2_field1
from t2 as sq2_alias1
where sq2_alias1 . col_int_key in (
select distinct c_sq2_alias1 . col_int_key as c_sq2_field1
from t3 as c_sq2_alias1
)
) )
or alias1 . col_int_key = 2
and alias2 . col_varchar_nokey <= alias1 . col_varchar_nokey
order by alias1 . col_varchar_key , field1
;
UPDATE where_updatedelete_20769 SET field1 = ( select count( alias2 . col_varchar_key ) as field1
from (
(select sq1_alias1 . *
from ( t3 as sq1_alias1
straight_join t1 as sq1_alias2
on (sq1_alias2 . col_varchar_key = sq1_alias1 . col_varchar_key)
)
where sq1_alias1 . col_int_key in (
select c_sq1_alias1 . pk as c_sq1_field1
from t2 as c_sq1_alias1
)
) as alias1
left outer join t1 as alias2
on (alias2 . col_varchar_key = alias1 . col_varchar_key )
)
where ( alias2 . col_varchar_key in (
select sq2_alias1 . col_varchar_nokey as sq2_field1
from t2 as sq2_alias1
where sq2_alias1 . col_int_key in (
select distinct c_sq2_alias1 . col_int_key as c_sq2_field1
from t3 as c_sq2_alias1
)
) )
or alias1 . col_int_key = 2
and alias2 . col_varchar_nokey <= alias1 . col_varchar_nokey
order by alias1 . col_varchar_key , field1
);
DROP TABLE where_updatedelete_20769;
DROP TABLE t1,t2,t3;
# BUG#12710761 - INVALID JSON TRACE ON SUBQUERY IN IN-CLAUSE
CREATE TABLE t1 (col_int_key int, KEY col_int_key (col_int_key));
INSERT INTO t1 VALUES (0),(8),(1),(8);
CREATE TABLE where_subselect_20070
SELECT table2 .col_int_key AS field1,
( SELECT COUNT( col_int_key )
FROM t1
)
FROM t1 AS table1
JOIN t1 AS table2
ON table2 .col_int_key = table1 .col_int_key;
SELECT *
FROM where_subselect_20070
WHERE (field1, ( SELECT COUNT( col_int_key ) FROM t1 )) IN (
SELECT table2 .col_int_key AS field1,
( SELECT COUNT( col_int_key )
FROM t1
)
FROM t1 AS table1
JOIN t1 AS table2
ON table2 .col_int_key = table1 .col_int_key
);
field1 ( SELECT COUNT( col_int_key )
FROM t1
)
0 4
1 4
8 4
8 4
8 4
8 4
select * from information_schema.optimizer_trace;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT *
FROM where_subselect_20070
WHERE (field1, ( SELECT COUNT( col_int_key ) FROM t1 )) IN (
SELECT table2 .col_int_key AS field1,
( SELECT COUNT( col_int_key )
FROM t1
)
FROM t1 AS table1
JOIN t1 AS table2
ON table2 .col_int_key = table1 .col_int_key
) {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"join_preparation": {
"select#": 3,
"steps": [
{
"join_preparation": {
"select#": 4,
"steps": [
{
"expanded_query": "/* select#4 */ select count(`t1`.`col_int_key`) from `t1`"
}
] /* steps */
} /* join_preparation */
},
{
"expanded_query": "/* select#3 */ select `table2`.`col_int_key` AS `field1`,(/* select#4 */ select count(`t1`.`col_int_key`) from `t1`) from (`t1` `table1` join `t1` `table2` on((`table2`.`col_int_key` = `table1`.`col_int_key`)))"
},
{
"join_preparation": {
"select#": 2,
"steps": [
{
"expanded_query": "/* select#2 */ select count(`t1`.`col_int_key`) from `t1`"
}
] /* steps */
} /* join_preparation */
},
{
"transformation": {
"select#": 3,
"from": "IN (SELECT)",
"to": "semijoin",
"chosen": true
} /* transformation */
}
] /* steps */
} /* join_preparation */
},
{
"expanded_query": "/* select#1 */ select `where_subselect_20070`.`field1` AS `field1`,`where_subselect_20070`.`( SELECT COUNT( col_int_key )\nFROM t1\n)` AS `( SELECT COUNT( col_int_key )\nFROM t1\n)` from `where_subselect_20070` where (`where_subselect_20070`.`field1`,(/* select#2 */ select count(`t1`.`col_int_key`) from `t1`)) in (/* select#3 */ select `table2`.`col_int_key` AS `field1`,(/* select#4 */ select count(`t1`.`col_int_key`) from `t1`) from (`t1` `table1` join `t1` `table2` on((`table2`.`col_int_key` = `table1`.`col_int_key`))))"
}
] /* steps */
} /* join_preparation */
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"transformation": {
"select#": 3,
"from": "IN (SELECT)",
"to": "semijoin",
"chosen": true,
"evaluating_constant_semijoin_conditions": [
] /* evaluating_constant_semijoin_conditions */
} /* transformation */
},
{
"transformations_to_nested_joins": {
"transformations": [
"semijoin",
"JOIN_condition_to_WHERE",
"parenthesis_removal"
] /* transformations */,
"expanded_query": "/* select#1 */ select `where_subselect_20070`.`field1` AS `field1`,`where_subselect_20070`.`( SELECT COUNT( col_int_key )\nFROM t1\n)` AS `( SELECT COUNT( col_int_key )\nFROM t1\n)` from `where_subselect_20070` semi join (`t1` `table1` join `t1` `table2`) where (1 and (`where_subselect_20070`.`field1` = `table2`.`col_int_key`) and ((/* select#2 */ select count(`t1`.`col_int_key`) from `t1`) = (/* select#4 */ select count(`t1`.`col_int_key`) from `t1`)) and (`table2`.`col_int_key` = `table1`.`col_int_key`))"
} /* transformations_to_nested_joins */
},
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(1 and (`where_subselect_20070`.`field1` = `table2`.`col_int_key`) and ((/* select#2 */ select count(`t1`.`col_int_key`) from `t1`) = (/* select#4 */ select count(`t1`.`col_int_key`) from `t1`)) and (`table2`.`col_int_key` = `table1`.`col_int_key`))",
"steps": [
{
"transformation": "equality_propagation",
"subselect_evaluation": [
] /* subselect_evaluation */,
"resulting_condition": "(1 and ((/* select#2 */ select count(`t1`.`col_int_key`) from `t1`) = (/* select#4 */ select count(`t1`.`col_int_key`) from `t1`)) and multiple equal(`where_subselect_20070`.`field1`, `table2`.`col_int_key`, `table1`.`col_int_key`))"
},
{
"transformation": "constant_propagation",
"subselect_evaluation": [
] /* subselect_evaluation */,
"resulting_condition": "(1 and ((/* select#2 */ select count(`t1`.`col_int_key`) from `t1`) = (/* select#4 */ select count(`t1`.`col_int_key`) from `t1`)) and multiple equal(`where_subselect_20070`.`field1`, `table2`.`col_int_key`, `table1`.`col_int_key`))"
},
{
"transformation": "trivial_condition_removal",
"subselect_evaluation": [
{
"subselect_execution": {
"select#": 2,
"steps": [
{
"join_optimization": {
"select#": 2,
"steps": [
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
] /* depends_on_map_bits */
}
] /* table_dependencies */
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 4,
"cost": 2
} /* table_scan */
}
] /* rows_estimation */
},
{
"considered_execution_plans": [
{
"plan_prefix": [
] /* plan_prefix */,
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "scan",
"rows": 4,
"cost": 2.8068,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 2.8068,
"rows_for_plan": 4,
"chosen": true
}
] /* considered_execution_plans */
},
{
"attaching_conditions_to_tables": {
"original_condition": null,
"attached_conditions_computation": [
] /* attached_conditions_computation */,
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": null
}
] /* attached_conditions_summary */
} /* attaching_conditions_to_tables */
},
{
"refine_plan": [
{
"table": "`t1`",
"access_type": "index_scan"
}
] /* refine_plan */
}
] /* steps */
} /* join_optimization */
},
{
"join_execution": {
"select#": 2,
"steps": [
] /* steps */
} /* join_execution */
}
] /* steps */
} /* subselect_execution */
},
{
"subselect_execution": {
"select#": 4,
"steps": [
{
"join_optimization": {
"select#": 4,
"steps": [
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
] /* depends_on_map_bits */
}
] /* table_dependencies */
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 4,
"cost": 2
} /* table_scan */
}
] /* rows_estimation */
},
{
"considered_execution_plans": [
{
"plan_prefix": [
] /* plan_prefix */,
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "scan",
"rows": 4,
"cost": 2.8068,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 2.8068,
"rows_for_plan": 4,
"chosen": true
}
] /* considered_execution_plans */
},
{
"attaching_conditions_to_tables": {
"original_condition": null,
"attached_conditions_computation": [
] /* attached_conditions_computation */,
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": null
}
] /* attached_conditions_summary */
} /* attaching_conditions_to_tables */
},
{
"refine_plan": [
{
"table": "`t1`",
"access_type": "index_scan"
}
] /* refine_plan */
}
] /* steps */
} /* join_optimization */
},
{
"join_execution": {
"select#": 4,
"steps": [
] /* steps */
} /* join_execution */
}
] /* steps */
} /* subselect_execution */
}
] /* subselect_evaluation */,
"resulting_condition": "multiple equal(`where_subselect_20070`.`field1`, `table2`.`col_int_key`, `table1`.`col_int_key`)"
}
] /* steps */
} /* condition_processing */
},
{
"table_dependencies": [
{
"table": "`where_subselect_20070`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
] /* depends_on_map_bits */
},
{
"table": "`t1` `table1`",
"row_may_be_null": false,
"map_bit": 1,
"depends_on_map_bits": [
] /* depends_on_map_bits */
},
{
"table": "`t1` `table2`",
"row_may_be_null": false,
"map_bit": 2,
"depends_on_map_bits": [
] /* depends_on_map_bits */
}
] /* table_dependencies */
},
{
"ref_optimizer_key_uses": [
{
"table": "`t1` `table1`",
"field": "col_int_key",
"equals": "`where_subselect_20070`.`field1`",
"null_rejecting": true
},
{
"table": "`t1` `table1`",
"field": "col_int_key",
"equals": "`table2`.`col_int_key`",
"null_rejecting": true
},
{
"table": "`t1` `table2`",
"field": "col_int_key",
"equals": "`where_subselect_20070`.`field1`",
"null_rejecting": true
},
{
"table": "`t1` `table2`",
"field": "col_int_key",
"equals": "`table1`.`col_int_key`",
"null_rejecting": true
}
] /* ref_optimizer_key_uses */
},
{
"pulled_out_semijoin_tables": [
] /* pulled_out_semijoin_tables */
},
{
"rows_estimation": [
{
"table": "`where_subselect_20070`",
"table_scan": {
"rows": 6,
"cost": 2
} /* table_scan */
},
{
"table": "`t1` `table1`",
"table_scan": {
"rows": 4,
"cost": 2
} /* table_scan */
},
{
"table": "`t1` `table2`",
"table_scan": {
"rows": 4,
"cost": 2
} /* table_scan */
}
] /* rows_estimation */
},
{
"execution_plan_for_potential_materialization": {
"steps": [
{
"considered_execution_plans": [
{
"plan_prefix": [
] /* plan_prefix */,
"table": "`t1` `table1`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "col_int_key",
"usable": false,
"chosen": false
},
{
"access_type": "scan",
"rows": 4,
"cost": 2.8068,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 2.8068,
"rows_for_plan": 4,
"rest_of_plan": [
{
"plan_prefix": [
"`t1` `table1`"
] /* plan_prefix */,
"table": "`t1` `table2`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "col_int_key",
"rows": 2,
"cost": 4.493,
"chosen": true
},
{
"access_type": "scan",
"using_join_cache": true,
"rows": 3,
"cost": 4.607,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 7.4138,
"rows_for_plan": 12,
"chosen": true
}
] /* rest_of_plan */
},
{
"plan_prefix": [
] /* plan_prefix */,
"table": "`t1` `table2`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "col_int_key",
"usable": false,
"chosen": false
},
{
"access_type": "scan",
"rows": 4,
"cost": 2.8068,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 2.8068,
"rows_for_plan": 4,
"rest_of_plan": [
{
"plan_prefix": [
"`t1` `table2`"
] /* plan_prefix */,
"table": "`t1` `table1`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "col_int_key",
"rows": 2,
"cost": 4.493,
"chosen": true
},
{
"access_type": "scan",
"using_join_cache": true,
"rows": 3,
"cost": 4.607,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 7.4138,
"rows_for_plan": 12,
"pruned_by_cost": true
}
] /* rest_of_plan */
}
] /* considered_execution_plans */
}
] /* steps */
} /* execution_plan_for_potential_materialization */
},
{
"considered_execution_plans": [
{
"plan_prefix": [
] /* plan_prefix */,
"table": "`where_subselect_20070`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "scan",
"rows": 6,
"cost": 3.219,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 3.219,
"rows_for_plan": 6,
"semijoin_strategy_choice": [
] /* semijoin_strategy_choice */,
"rest_of_plan": [
{
"plan_prefix": [
"`where_subselect_20070`"
] /* plan_prefix */,
"table": "`t1` `table1`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "col_int_key",
"rows": 2,
"cost": 6.5395,
"chosen": true
},
{
"access_type": "scan",
"using_join_cache": true,
"rows": 3,
"cost": 5.8074,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 9.0265,
"rows_for_plan": 18,
"semijoin_strategy_choice": [
] /* semijoin_strategy_choice */,
"rest_of_plan": [
{
"plan_prefix": [
"`where_subselect_20070`",
"`t1` `table1`"
] /* plan_prefix */,
"table": "`t1` `table2`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "col_int_key",
"rows": 2,
"cost": 18.819,
"chosen": true
},
{
"access_type": "scan",
"using_join_cache": true,
"rows": 3,
"cost": 13.009,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 22.036,
"rows_for_plan": 54,
"semijoin_strategy_choice": [
{
"strategy": "FirstMatch",
"recalculate_access_paths_and_cost": {
"tables": [
{
"table": "`t1` `table1`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "col_int_key",
"rows": 2,
"cost": 6.5395,
"chosen": true
},
{
"access_type": "scan",
"rows": 3,
"cost": 16.841,
"chosen": false
}
] /* considered_access_paths */
} /* best_access_path */
},
{
"table": "`t1` `table2`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "col_int_key",
"rows": 2,
"cost": 12.679,
"chosen": true
},
{
"access_type": "scan",
"rows": 3,
"cost": 33.682,
"chosen": false
}
] /* considered_access_paths */
} /* best_access_path */
}
] /* tables */
} /* recalculate_access_paths_and_cost */,
"cost": 28.838,
"rows": 6,
"chosen": true
},
{
"strategy": "MaterializeLookup",
"cost": 16.233,
"rows": 6,
"duplicate_tables_left": false,
"chosen": true
},
{
"strategy": "DuplicatesWeedout",
"cost": 36.036,
"rows": 6,
"duplicate_tables_left": false,
"chosen": false
}
] /* semijoin_strategy_choice */,
"chosen": true
}
] /* rest_of_plan */
},
{
"plan_prefix": [
"`where_subselect_20070`"
] /* plan_prefix */,
"table": "`t1` `table2`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "col_int_key",
"rows": 2,
"cost": 6.5395,
"chosen": true
},
{
"access_type": "scan",
"using_join_cache": true,
"rows": 3,
"cost": 5.8074,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 9.0265,
"rows_for_plan": 18,
"semijoin_strategy_choice": [
] /* semijoin_strategy_choice */,
"rest_of_plan": [
{
"plan_prefix": [
"`where_subselect_20070`",
"`t1` `table2`"
] /* plan_prefix */,
"table": "`t1` `table1`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "col_int_key",
"rows": 2,
"cost": 18.819,
"chosen": true
},
{
"access_type": "scan",
"using_join_cache": true,
"rows": 3,
"cost": 13.009,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 22.036,
"rows_for_plan": 54,
"semijoin_strategy_choice": [
{
"strategy": "FirstMatch",
"recalculate_access_paths_and_cost": {
"tables": [
{
"table": "`t1` `table2`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "col_int_key",
"rows": 2,
"cost": 6.5395,
"chosen": true
},
{
"access_type": "scan",
"rows": 3,
"cost": 16.841,
"chosen": false
}
] /* considered_access_paths */
} /* best_access_path */
},
{
"table": "`t1` `table1`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "col_int_key",
"rows": 2,
"cost": 12.679,
"chosen": true
},
{
"access_type": "scan",
"rows": 3,
"cost": 33.682,
"chosen": false
}
] /* considered_access_paths */
} /* best_access_path */
}
] /* tables */
} /* recalculate_access_paths_and_cost */,
"cost": 28.838,
"rows": 6,
"chosen": true
},
{
"strategy": "MaterializeLookup",
"cost": 16.233,
"rows": 6,
"duplicate_tables_left": false,
"chosen": true
},
{
"strategy": "DuplicatesWeedout",
"cost": 36.036,
"rows": 6,
"duplicate_tables_left": false,
"chosen": false
}
] /* semijoin_strategy_choice */,
"pruned_by_cost": true
}
] /* rest_of_plan */
}
] /* rest_of_plan */
},
{
"plan_prefix": [
] /* plan_prefix */,
"table": "`t1` `table1`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "col_int_key",
"usable": false,
"chosen": false
},
{
"access_type": "scan",
"rows": 4,
"cost": 2.8068,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 2.8068,
"rows_for_plan": 4,
"semijoin_strategy_choice": [
] /* semijoin_strategy_choice */,
"rest_of_plan": [
{
"plan_prefix": [
"`t1` `table1`"
] /* plan_prefix */,
"table": "`where_subselect_20070`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "scan",
"using_join_cache": true,
"rows": 6,
"cost": 6.8192,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 9.626,
"rows_for_plan": 24,
"semijoin_strategy_choice": [
] /* semijoin_strategy_choice */,
"rest_of_plan": [
{
"plan_prefix": [
"`t1` `table1`",
"`where_subselect_20070`"
] /* plan_prefix */,
"table": "`t1` `table2`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "col_int_key",
"rows": 2,
"cost": 24.958,
"chosen": true
},
{
"access_type": "scan",
"using_join_cache": true,
"rows": 3,
"cost": 16.61,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 26.236,
"rows_for_plan": 72,
"semijoin_strategy_choice": [
{
"strategy": "DuplicatesWeedout",
"cost": 43.836,
"rows": 6,
"duplicate_tables_left": true,
"chosen": true
}
] /* semijoin_strategy_choice */,
"pruned_by_cost": true
}
] /* rest_of_plan */
},
{
"plan_prefix": [
"`t1` `table1`"
] /* plan_prefix */,
"table": "`t1` `table2`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "col_int_key",
"rows": 2,
"cost": 4.493,
"chosen": true
},
{
"access_type": "scan",
"using_join_cache": true,
"rows": 3,
"cost": 4.607,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 7.4138,
"rows_for_plan": 12,
"semijoin_strategy_choice": [
{
"strategy": "MaterializeScan",
"choice": "deferred"
}
] /* semijoin_strategy_choice */,
"rest_of_plan": [
{
"plan_prefix": [
"`t1` `table1`",
"`t1` `table2`"
] /* plan_prefix */,
"table": "`where_subselect_20070`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "scan",
"using_join_cache": true,
"rows": 6,
"cost": 16.42,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 23.834,
"rows_for_plan": 72,
"semijoin_strategy_choice": [
{
"strategy": "MaterializeScan",
"recalculate_access_paths_and_cost": {
"tables": [
{
"table": "`where_subselect_20070`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "scan",
"using_join_cache": true,
"rows": 6,
"cost": 6.8194,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */
}
] /* tables */
} /* recalculate_access_paths_and_cost */,
"cost": 19.433,
"rows": 6,
"duplicate_tables_left": true,
"chosen": true
},
{
"strategy": "DuplicatesWeedout",
"cost": 41.434,
"rows": 6,
"duplicate_tables_left": false,
"chosen": false
}
] /* semijoin_strategy_choice */,
"pruned_by_cost": true
}
] /* rest_of_plan */
}
] /* rest_of_plan */
},
{
"plan_prefix": [
] /* plan_prefix */,
"table": "`t1` `table2`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "col_int_key",
"rows": 2e308,
"cost": 0,
"chosen": false
},
{
"access_type": "scan",
"rows": 4,
"cost": 2.8068,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 2.8068,
"rows_for_plan": 4,
"semijoin_strategy_choice": [
] /* semijoin_strategy_choice */,
"rest_of_plan": [
{
"plan_prefix": [
"`t1` `table2`"
] /* plan_prefix */,
"table": "`where_subselect_20070`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "scan",
"using_join_cache": true,
"rows": 6,
"cost": 6.8192,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 9.626,
"rows_for_plan": 24,
"semijoin_strategy_choice": [
] /* semijoin_strategy_choice */,
"rest_of_plan": [
{
"plan_prefix": [
"`t1` `table2`",
"`where_subselect_20070`"
] /* plan_prefix */,
"table": "`t1` `table1`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "col_int_key",
"rows": 2,
"cost": 24.958,
"chosen": true
},
{
"access_type": "scan",
"using_join_cache": true,
"rows": 3,
"cost": 16.61,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 26.236,
"rows_for_plan": 72,
"semijoin_strategy_choice": [
{
"strategy": "DuplicatesWeedout",
"cost": 43.836,
"rows": 6,
"duplicate_tables_left": true,
"chosen": true
}
] /* semijoin_strategy_choice */,
"pruned_by_cost": true
}
] /* rest_of_plan */
},
{
"plan_prefix": [
"`t1` `table2`"
] /* plan_prefix */,
"table": "`t1` `table1`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "col_int_key",
"rows": 2,
"cost": 4.493,
"chosen": true
},
{
"access_type": "scan",
"using_join_cache": true,
"rows": 3,
"cost": 4.607,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 7.4138,
"rows_for_plan": 12,
"semijoin_strategy_choice": [
{
"strategy": "MaterializeScan",
"choice": "deferred"
}
] /* semijoin_strategy_choice */,
"rest_of_plan": [
{
"plan_prefix": [
"`t1` `table2`",
"`t1` `table1`"
] /* plan_prefix */,
"table": "`where_subselect_20070`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "scan",
"using_join_cache": true,
"rows": 6,
"cost": 16.42,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 23.834,
"rows_for_plan": 72,
"semijoin_strategy_choice": [
{
"strategy": "MaterializeScan",
"recalculate_access_paths_and_cost": {
"tables": [
{
"table": "`where_subselect_20070`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "scan",
"using_join_cache": true,
"rows": 6,
"cost": 6.8194,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */
}
] /* tables */
} /* recalculate_access_paths_and_cost */,
"cost": 19.433,
"rows": 6,
"duplicate_tables_left": true,
"chosen": true
},
{
"strategy": "DuplicatesWeedout",
"cost": 41.434,
"rows": 6,
"duplicate_tables_left": false,
"chosen": false
}
] /* semijoin_strategy_choice */,
"pruned_by_cost": true
}
] /* rest_of_plan */
}
] /* rest_of_plan */
},
{
"final_semijoin_strategy": "MaterializeLookup"
}
] /* considered_execution_plans */
},
{
"creating_tmp_table": {
"tmp_table_info": {
"row_length": 13,
"key_length": 14,
"unique_constraint": false,
"location": "memory (heap)",
"row_limit_estimate": 80659
} /* tmp_table_info */
} /* creating_tmp_table */
},
{
"subselect_execution": {
"select#": 2,
"steps": [
] /* steps */
} /* subselect_execution */
},
{
"attaching_conditions_to_tables": {
"original_condition": "((`<subquery3>`.`field1` = `where_subselect_20070`.`field1`) and (`table2`.`col_int_key` = `table1`.`col_int_key`))",
"attached_conditions_computation": [
{
"table": "`t1` `table2`",
"rechecking_index_usage": {
"recheck_reason": "not_first_table",
"range_analysis": {
"table_scan": {
"rows": 4,
"cost": 4.9068
} /* table_scan */,
"potential_range_indices": [
{
"index": "col_int_key",
"usable": true,
"key_parts": [
"col_int_key"
] /* key_parts */
}
] /* potential_range_indices */,
"best_covering_index_scan": {
"index": "col_int_key",
"cost": 1.8698,
"chosen": true
} /* best_covering_index_scan */,
"setup_range_conditions": [
] /* setup_range_conditions */,
"group_index_range": {
"chosen": false,
"cause": "not_single_table"
} /* group_index_range */,
"analyzing_range_alternatives": {
"range_scan_alternatives": [
{
"index": "col_int_key",
"chosen": false,
"cause": "unknown"
}
] /* range_scan_alternatives */,
"analyzing_roworder_intersect": {
"usable": false,
"cause": "too_few_roworder_scans"
} /* analyzing_roworder_intersect */
} /* analyzing_range_alternatives */
} /* range_analysis */
} /* rechecking_index_usage */
}
] /* attached_conditions_computation */,
"attached_conditions_summary": [
{
"table": "`where_subselect_20070`",
"attached": "(`where_subselect_20070`.`field1` is not null)"
},
{
"table": "``.`<subquery3>`",
"attached": null
},
{
"table": "`t1` `table1`",
"attached": null
},
{
"table": "`t1` `table2`",
"attached": "(`table2`.`col_int_key` = `table1`.`col_int_key`)"
}
] /* attached_conditions_summary */
} /* attaching_conditions_to_tables */
},
{
"refine_plan": [
{
"table": "`where_subselect_20070`",
"access_type": "table_scan"
},
{
"table": "``.`<subquery3>`"
},
{
"table": "`t1` `table1`",
"access_type": "index_scan"
},
{
"table": "`t1` `table2`",
"access_type": "index_scan"
}
] /* refine_plan */
}
] /* steps */
} /* join_optimization */
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"subselect_execution": {
"select#": 4,
"steps": [
] /* steps */
} /* subselect_execution */
},
{
"subselect_execution": {
"select#": 4,
"steps": [
] /* steps */
} /* subselect_execution */
},
{
"subselect_execution": {
"select#": 4,
"steps": [
] /* steps */
} /* subselect_execution */
},
{
"subselect_execution": {
"select#": 4,
"steps": [
] /* steps */
} /* subselect_execution */
},
{
"subselect_execution": {
"select#": 4,
"steps": [
] /* steps */
} /* subselect_execution */
},
{
"subselect_execution": {
"select#": 4,
"steps": [
] /* steps */
} /* subselect_execution */
},
{
"subselect_execution": {
"select#": 4,
"steps": [
] /* steps */
} /* subselect_execution */
},
{
"subselect_execution": {
"select#": 4,
"steps": [
] /* steps */
} /* subselect_execution */
},
{
"subselect_execution": {
"select#": 4,
"steps": [
] /* steps */
} /* subselect_execution */
},
{
"subselect_execution": {
"select#": 4,
"steps": [
] /* steps */
} /* subselect_execution */
},
{
"subselect_execution": {
"select#": 4,
"steps": [
] /* steps */
} /* subselect_execution */
},
{
"subselect_execution": {
"select#": 4,
"steps": [
] /* steps */
} /* subselect_execution */
}
] /* steps */
} /* join_execution */
}
] /* steps */
} 0 0
DROP TABLE where_subselect_20070,t1;
#
# Bug#13430443 - ASSERTION `NEW_TYPE[0] != 'U'' FAILED. WHEN
# OPTIMIZER_TRACE IS ENABLED
#
CREATE TABLE t1
(a INT,b INT,c INT, KEY(a),KEY (a,c)) ENGINE=INNODB;
SELECT 1 FROM t1 WHERE 1 LIKE
(SELECT a FROM t1 WHERE a = 1 ORDER BY c);
1
SELECT * FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT 1 FROM t1 WHERE 1 LIKE
(SELECT a FROM t1 WHERE a = 1 ORDER BY c) {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"join_preparation": {
"select#": 2,
"steps": [
{
"expanded_query": "/* select#2 */ select `t1`.`a` from `t1` where (`t1`.`a` = 1) order by `t1`.`c`"
}
] /* steps */
} /* join_preparation */
},
{
"expanded_query": "/* select#1 */ select 1 AS `1` from `t1` where (1 like (/* select#2 */ select `t1`.`a` from `t1` where (`t1`.`a` = 1) order by `t1`.`c`))"
}
] /* steps */
} /* join_preparation */
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(1 like (/* select#2 */ select `t1`.`a` from `t1` where (`t1`.`a` = 1) order by `t1`.`c`))",
"steps": [
{
"transformation": "equality_propagation",
"subselect_evaluation": [
] /* subselect_evaluation */,
"resulting_condition": "(1 like (/* select#2 */ select `t1`.`a` from `t1` where (`t1`.`a` = 1) order by `t1`.`c`))"
},
{
"transformation": "constant_propagation",
"subselect_evaluation": [
] /* subselect_evaluation */,
"resulting_condition": "(1 like (/* select#2 */ select `t1`.`a` from `t1` where (`t1`.`a` = 1) order by `t1`.`c`))"
},
{
"transformation": "trivial_condition_removal",
"subselect_evaluation": [
{
"subselect_execution": {
"select#": 2,
"steps": [
{
"join_optimization": {
"select#": 2,
"steps": [
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(`t1`.`a` = 1)",
"steps": [
{
"transformation": "equality_propagation",
"resulting_condition": "multiple equal(1, `t1`.`a`)"
},
{
"transformation": "constant_propagation",
"resulting_condition": "multiple equal(1, `t1`.`a`)"
},
{
"transformation": "trivial_condition_removal",
"resulting_condition": "multiple equal(1, `t1`.`a`)"
}
] /* steps */
} /* condition_processing */
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
] /* depends_on_map_bits */
}
] /* table_dependencies */
},
{
"ref_optimizer_key_uses": [
{
"table": "`t1`",
"field": "a",
"equals": "1",
"null_rejecting": false
},
{
"table": "`t1`",
"field": "a",
"equals": "1",
"null_rejecting": false
}
] /* ref_optimizer_key_uses */
},
{
"rows_estimation": [
{
"table": "`t1`",
"range_analysis": {
"table_scan": {
"rows": 1,
"cost": 3.3
} /* table_scan */,
"potential_range_indices": [
{
"index": "a",
"usable": true,
"key_parts": [
"a"
] /* key_parts */
},
{
"index": "a_2",
"usable": true,
"key_parts": [
"a",
"c"
] /* key_parts */
}
] /* potential_range_indices */,
"best_covering_index_scan": {
"index": "a_2",
"cost": 1.2,
"chosen": true
} /* best_covering_index_scan */,
"setup_range_conditions": [
] /* setup_range_conditions */,
"group_index_range": {
"chosen": false,
"cause": "not_group_by_or_distinct"
} /* group_index_range */,
"analyzing_range_alternatives": {
"range_scan_alternatives": [
{
"index": "a",
"ranges": [
"1 <= a <= 1"
] /* ranges */,
"index_dives_for_eq_ranges": true,
"rowid_ordered": true,
"using_mrr": true,
"index_only": false,
"rows": 1,
"cost": 2.1031,
"chosen": false,
"cause": "cost"
},
{
"index": "a_2",
"ranges": [
"1 <= a <= 1"
] /* ranges */,
"index_dives_for_eq_ranges": true,
"rowid_ordered": false,
"using_mrr": false,
"index_only": true,
"rows": 1,
"cost": 2.21,
"chosen": false,
"cause": "cost"
}
] /* range_scan_alternatives */,
"analyzing_roworder_intersect": {
"usable": false,
"cause": "too_few_roworder_scans"
} /* analyzing_roworder_intersect */
} /* analyzing_range_alternatives */
} /* range_analysis */
}
] /* rows_estimation */
},
{
"considered_execution_plans": [
{
"plan_prefix": [
] /* plan_prefix */,
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "a",
"rows": 1,
"cost": 1.2,
"chosen": true
},
{
"access_type": "ref",
"index": "a_2",
"rows": 1,
"cost": 1.2,
"chosen": false
},
{
"access_type": "scan",
"cause": "covering_index_better_than_full_scan",
"chosen": false
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 1.2,
"rows_for_plan": 1,
"chosen": true
}
] /* considered_execution_plans */
},
{
"attaching_conditions_to_tables": {
"original_condition": "(`t1`.`a` = 1)",
"attached_conditions_computation": [
] /* attached_conditions_computation */,
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": null
}
] /* attached_conditions_summary */
} /* attaching_conditions_to_tables */
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`c`",
"items": [
{
"item": "`t1`.`c`"
}
] /* items */,
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`c`"
} /* clause_processing */
},
{
"refine_plan": [
{
"table": "`t1`"
}
] /* refine_plan */
},
{
"added_back_ref_condition": "((`t1`.`a` <=> 1))"
},
{
"reconsidering_access_paths_for_index_ordering": {
"clause": "ORDER BY",
"index_order_summary": {
"table": "`t1`",
"index_provides_order": true,
"order_direction": "asc",
"index": "a_2",
"plan_changed": true,
"access_type": "ref"
} /* index_order_summary */
} /* reconsidering_access_paths_for_index_ordering */
}
] /* steps */
} /* join_optimization */
},
{
"join_execution": {
"select#": 2,
"steps": [
] /* steps */
} /* join_execution */
}
] /* steps */
} /* subselect_execution */
}
] /* subselect_evaluation */,
"resulting_condition": null
}
] /* steps */
} /* condition_processing */
}
] /* steps */,
"empty_result": {
"cause": "Impossible WHERE"
} /* empty_result */
} /* join_optimization */
},
{
"join_execution": {
"select#": 1,
"steps": [
] /* steps */
} /* join_execution */
}
] /* steps */
} 0 0
DROP TABLE t1;
#
# Bug#18791851 CRASH IN ST_SELECT_LEX::PRINT WITH OPTIMIZER_TRACE ON SUBQUERY
#
CREATE TABLE t1 (
pk INT NOT NULL,
col_int_nokey INT,
col_int_key INT,
col_time_key time,
col_varchar_key VARCHAR(1),
col_varchar_nokey VARCHAR(1),
PRIMARY KEY (pk),
KEY col_varchar_key (col_varchar_key,col_int_key)
);
CREATE TABLE t2 (
pk INT NOT NULL,
col_int_nokey INT,
col_int_key INT,
col_varchar_key VARCHAR(1),
col_varchar_nokey VARCHAR(1),
PRIMARY KEY (pk),
KEY col_varchar_key (col_varchar_key,col_int_key)
);
CREATE TABLE t3 (
pk INT NOT NULL,
col_int_nokey INT,
col_int_key INT,
col_varchar_key VARCHAR(1),
col_varchar_nokey VARCHAR(1),
PRIMARY KEY (pk),
KEY col_varchar_key (col_varchar_key,col_int_key)
);
CREATE TABLE t4 (
pk INT NOT NULL,
col_int_nokey INT,
col_int_key INT,
col_time_key time,
col_varchar_key VARCHAR(1),
col_varchar_nokey VARCHAR(1),
PRIMARY KEY (pk),
KEY col_varchar_key (col_varchar_key,col_int_key)
);
SELECT alias1.col_int_nokey AS field1,
alias2.col_varchar_key AS field2,
alias1.col_time_key AS field3,
MIN( alias1.col_int_nokey ) AS field4
FROM (
(
SELECT SQ1_alias1.*
FROM ( t1 AS SQ1_alias1, t2 AS SQ1_alias2 )
) AS alias1,
t4 AS alias2
)
WHERE
EXISTS (
SELECT DISTINCT SQ2_alias2.col_varchar_nokey AS SQ2_field1
FROM t2 AS SQ2_alias1
INNER JOIN (t4 AS SQ2_alias2
INNER JOIN t3 AS SQ2_alias3
ON SQ2_alias3.pk = SQ2_alias2.pk)
ON SQ2_alias3.col_varchar_key = SQ2_alias2.col_varchar_nokey
)
AND alias1.col_int_key = alias2.pk
HAVING alias1.col_int_nokey IN ( SELECT 2 FROM DUAL ) ;
field1 field2 field3 field4
DROP TABLE t1,t2,t3,t4;
#
# Bug #23259872: OPTIMIZER CHOOSES TO USE NON PRIMARY
# INDEX, EVEN THOUGH COST IS HIGHER
#
CREATE TABLE t1 (
a TINYTEXT NOT NULL,
b TINYINT(3) UNSIGNED NOT NULL,
PRIMARY KEY (a(32),b),
KEY b_idx(b)
) ENGINE=INNODB;
INSERT INTO t1 VALUES ('a',1),('a',2),('a',3),('b',1),('b',4),('c',1),('d',1),
('c',4),('d',3),('e',2),('f',2);
ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze status OK
SET @optimizer_switch_saved=@@session.optimizer_switch;
SET @@session.optimizer_switch=default;
EXPLAIN SELECT * FROM t1 WHERE a IN ('a', 'b') AND b = 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range PRIMARY,b_idx b_idx 35 NULL 2 Using index condition; Using where
SELECT TRACE into @trace FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE;
SELECT @trace RLIKE "rerunning_range_optimizer_for_single_index";
@trace RLIKE "rerunning_range_optimizer_for_single_index"
1
SET @@session.optimizer_switch=@optimizer_switch_saved;
DROP TABLE t1;
./BlackJoker Mini Shell 1.0