GIF89a;
Mini Shell
Mini Shell
SET optimizer_trace_max_mem_size=1048576;
SET end_markers_in_json=on;
SET optimizer_trace="enabled=on,one_line=off";
CREATE TABLE t1 (a INT);
CREATE TABLE t2 (a INT, b INT);
INSERT INTO t1 VALUES (2);
INSERT INTO t2 VALUES (1,7),(2,7);
# Subselect execute is traced every time it is executed
SET @@optimizer_trace_features="greedy_search=off,repeated_subselect=on";
SELECT (SELECT a FROM t1 WHERE t1.a=t2.a), a FROM t2;
(SELECT a FROM t1 WHERE t1.a=t2.a) a
NULL 1
2 2
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT (SELECT a FROM t1 WHERE t1.a=t2.a), a FROM t2 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"join_preparation": {
"select#": 2,
"steps": [
{
"expanded_query": "/* select#2 */ select `t1`.`a` from `t1` where (`t1`.`a` = `t2`.`a`)"
}
] /* steps */
} /* join_preparation */
},
{
"expanded_query": "/* select#1 */ select (/* select#2 */ select `t1`.`a` from `t1` where (`t1`.`a` = `t2`.`a`)) AS `(SELECT a FROM t1 WHERE t1.a=t2.a)`,`t2`.`a` AS `a` from `t2`"
}
] /* steps */
} /* join_preparation */
},
{
"join_optimization": {
"select#": 1,
"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`",
"table_scan": {
"rows": 2,
"cost": 2
} /* table_scan */
}
] /* rows_estimation */
},
{
"considered_execution_plans": "..."
},
{
"attaching_conditions_to_tables": {
"original_condition": null,
"attached_conditions_computation": [
] /* attached_conditions_computation */,
"attached_conditions_summary": [
{
"table": "`t2`",
"attached": null
}
] /* attached_conditions_summary */
} /* attaching_conditions_to_tables */
},
{
"refine_plan": [
{
"table": "`t2`",
"access_type": "table_scan"
}
] /* refine_plan */
}
] /* steps */
} /* join_optimization */
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"subselect_execution": {
"select#": 2,
"steps": [
{
"join_optimization": {
"select#": 2,
"steps": [
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(`t1`.`a` = `t2`.`a`)",
"steps": [
{
"transformation": "equality_propagation",
"resulting_condition": "(`t1`.`a` = `t2`.`a`)"
},
{
"transformation": "constant_propagation",
"resulting_condition": "(`t1`.`a` = `t2`.`a`)"
},
{
"transformation": "trivial_condition_removal",
"resulting_condition": "(`t1`.`a` = `t2`.`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": [
] /* ref_optimizer_key_uses */
},
{
"rows_estimation": [
{
"table": "`t1`",
"rows": 1,
"cost": 1,
"table_type": "system",
"empty": false
}
] /* rows_estimation */
},
{
"attaching_conditions_to_tables": {
"original_condition": "('2' = `t2`.`a`)",
"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#": 2,
"steps": [
] /* steps */
} /* join_execution */
}
] /* steps */
} /* subselect_execution */
},
{
"subselect_execution": {
"select#": 2,
"steps": [
{
"join_execution": {
"select#": 2,
"steps": [
] /* steps */
} /* join_execution */
}
] /* steps */
} /* subselect_execution */
}
] /* steps */
} /* join_execution */
}
] /* steps */
} 0 0
# Subselect execute is traced only the first time it is executed
SET @@optimizer_trace_features="greedy_search=off,repeated_subselect=off";
SELECT (SELECT a FROM t1 WHERE t1.a=t2.a), a FROM t2;
(SELECT a FROM t1 WHERE t1.a=t2.a) a
NULL 1
2 2
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT (SELECT a FROM t1 WHERE t1.a=t2.a), a FROM t2 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"join_preparation": {
"select#": 2,
"steps": [
{
"expanded_query": "/* select#2 */ select `t1`.`a` from `t1` where (`t1`.`a` = `t2`.`a`)"
}
] /* steps */
} /* join_preparation */
},
{
"expanded_query": "/* select#1 */ select (/* select#2 */ select `t1`.`a` from `t1` where (`t1`.`a` = `t2`.`a`)) AS `(SELECT a FROM t1 WHERE t1.a=t2.a)`,`t2`.`a` AS `a` from `t2`"
}
] /* steps */
} /* join_preparation */
},
{
"join_optimization": {
"select#": 1,
"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`",
"table_scan": {
"rows": 2,
"cost": 2
} /* table_scan */
}
] /* rows_estimation */
},
{
"considered_execution_plans": "..."
},
{
"attaching_conditions_to_tables": {
"original_condition": null,
"attached_conditions_computation": [
] /* attached_conditions_computation */,
"attached_conditions_summary": [
{
"table": "`t2`",
"attached": null
}
] /* attached_conditions_summary */
} /* attaching_conditions_to_tables */
},
{
"refine_plan": [
{
"table": "`t2`",
"access_type": "table_scan"
}
] /* refine_plan */
}
] /* steps */
} /* join_optimization */
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"subselect_execution": {
"select#": 2,
"steps": [
{
"join_optimization": {
"select#": 2,
"steps": [
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(`t1`.`a` = `t2`.`a`)",
"steps": [
{
"transformation": "equality_propagation",
"resulting_condition": "(`t1`.`a` = `t2`.`a`)"
},
{
"transformation": "constant_propagation",
"resulting_condition": "(`t1`.`a` = `t2`.`a`)"
},
{
"transformation": "trivial_condition_removal",
"resulting_condition": "(`t1`.`a` = `t2`.`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": [
] /* ref_optimizer_key_uses */
},
{
"rows_estimation": [
{
"table": "`t1`",
"rows": 1,
"cost": 1,
"table_type": "system",
"empty": false
}
] /* rows_estimation */
},
{
"attaching_conditions_to_tables": {
"original_condition": "('2' = `t2`.`a`)",
"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#": 2,
"steps": [
] /* steps */
} /* join_execution */
}
] /* steps */
} /* subselect_execution */
}
] /* steps */
} /* join_execution */
}
] /* steps */
} 0 0
DROP TABLE t1,t2;
SET @@optimizer_trace_features="default";
CREATE TABLE t1 (a FLOAT(5,4) zerofill);
CREATE TABLE t2 (a FLOAT(5,4),b FLOAT(2,0));
SELECT t1.a
FROM t1
WHERE t1.a= (SELECT b FROM t2 LIMIT 1) AND NOT
t1.a= (SELECT a FROM t2 LIMIT 1) ;
a
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT t1.a
FROM t1
WHERE t1.a= (SELECT b FROM t2 LIMIT 1) AND NOT
t1.a= (SELECT a FROM t2 LIMIT 1) {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"join_preparation": {
"select#": 2,
"steps": [
{
"expanded_query": "/* select#2 */ select `t2`.`b` from `t2` limit 1"
}
] /* steps */
} /* join_preparation */
},
{
"join_preparation": {
"select#": 3,
"steps": [
{
"expanded_query": "/* select#3 */ select `t2`.`a` from `t2` limit 1"
}
] /* steps */
} /* join_preparation */
},
{
"expanded_query": "/* select#1 */ select `t1`.`a` AS `a` from `t1` where ((`t1`.`a` = (/* select#2 */ select `t2`.`b` from `t2` limit 1)) and (`t1`.`a` <> (/* select#3 */ select `t2`.`a` from `t2` limit 1)))"
}
] /* steps */
} /* join_preparation */
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "((`t1`.`a` = (/* select#2 */ select `t2`.`b` from `t2` limit 1)) and (`t1`.`a` <> (/* select#3 */ select `t2`.`a` from `t2` limit 1)))",
"steps": [
{
"transformation": "equality_propagation",
"subselect_evaluation": [
{
"subselect_execution": {
"select#": 2,
"steps": [
{
"join_optimization": {
"select#": 2,
"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": true
}
] /* rows_estimation */
}
] /* steps */,
"empty_result": {
"cause": "no matching row in const table"
} /* empty_result */
} /* join_optimization */
},
{
"join_execution": {
"select#": 2,
"steps": [
] /* steps */
} /* join_execution */
}
] /* steps */
} /* subselect_execution */
},
{
"subselect_execution": {
"select#": 2,
"steps": [
] /* steps */
} /* subselect_execution */
}
] /* subselect_evaluation */,
"resulting_condition": "((NULL <> (/* select#3 */ select `t2`.`a` from `t2` limit 1)) and multiple equal((/* select#2 */ select NULL from `t2` limit 1), `t1`.`a`))"
},
{
"transformation": "constant_propagation",
"subselect_evaluation": [
] /* subselect_evaluation */,
"resulting_condition": "((NULL <> (/* select#3 */ select `t2`.`a` from `t2` limit 1)) and multiple equal((/* select#2 */ select NULL from `t2` limit 1), `t1`.`a`))"
},
{
"transformation": "trivial_condition_removal",
"subselect_evaluation": [
] /* 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
SELECT 1 FROM DUAL
WHERE NOT EXISTS
(SELECT * FROM t2 WHERE a = 50 AND b = 3);
1
1
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT 1 FROM DUAL
WHERE NOT EXISTS
(SELECT * FROM t2 WHERE a = 50 AND b = 3) {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"join_preparation": {
"select#": 2,
"steps": [
{
"expanded_query": "/* select#2 */ select 1 from `t2` where ((`t2`.`a` = 50) and (`t2`.`b` = 3))"
}
] /* steps */
} /* join_preparation */
},
{
"expanded_query": "/* select#1 */ select 1 AS `1` from DUAL where (not(exists(/* select#2 */ select 1 from `t2` where ((`t2`.`a` = 50) and (`t2`.`b` = 3)))))"
}
] /* steps */
} /* join_preparation */
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(not(exists(/* select#2 */ select 1 from `t2` where ((`t2`.`a` = 50) and (`t2`.`b` = 3)))))",
"steps": [
{
"transformation": "equality_propagation",
"subselect_evaluation": [
] /* subselect_evaluation */,
"resulting_condition": "(not(exists(/* select#2 */ select 1 from `t2` where ((`t2`.`a` = 50) and (`t2`.`b` = 3)))))"
},
{
"transformation": "constant_propagation",
"subselect_evaluation": [
] /* subselect_evaluation */,
"resulting_condition": "(not(exists(/* select#2 */ select 1 from `t2` where ((`t2`.`a` = 50) and (`t2`.`b` = 3)))))"
},
{
"transformation": "trivial_condition_removal",
"subselect_evaluation": [
{
"subselect_execution": {
"select#": 2,
"steps": [
{
"join_optimization": {
"select#": 2,
"steps": [
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "((`t2`.`a` = 50) and (`t2`.`b` = 3))",
"steps": [
{
"transformation": "equality_propagation",
"resulting_condition": "((`t2`.`a` = 50) and (`t2`.`b` = 3))"
},
{
"transformation": "constant_propagation",
"resulting_condition": "((`t2`.`a` = 50) and (`t2`.`b` = 3))"
},
{
"transformation": "trivial_condition_removal",
"resulting_condition": "((`t2`.`a` = 50) and (`t2`.`b` = 3))"
}
] /* steps */
} /* condition_processing */
},
{
"table_dependencies": [
{
"table": "`t2`",
"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": "`t2`",
"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#": 2,
"steps": [
] /* steps */
} /* join_execution */
}
] /* steps */
} /* subselect_execution */
}
] /* subselect_evaluation */,
"resulting_condition": null
}
] /* steps */
} /* condition_processing */
}
] /* steps */
} /* join_optimization */
},
{
"join_execution": {
"select#": 1,
"steps": [
] /* steps */
} /* join_execution */
}
] /* steps */
} 0 0
SELECT 1 FROM DUAL WHERE NOT EXISTS (SELECT DISTINCT(a) FROM t2 GROUP BY a ORDER BY b);
1
1
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT 1 FROM DUAL WHERE NOT EXISTS (SELECT DISTINCT(a) FROM t2 GROUP BY a ORDER BY b) {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"join_preparation": {
"select#": 2,
"steps": [
{
"transformations_to_subquery": [
"removed_ordering",
"removed_distinct",
"removed_grouping"
] /* transformations_to_subquery */
},
{
"expanded_query": "/* select#2 */ select `t2`.`a` from `t2`"
}
] /* steps */
} /* join_preparation */
},
{
"expanded_query": "/* select#1 */ select 1 AS `1` from DUAL where (not(exists(/* select#2 */ select `t2`.`a` from `t2`)))"
}
] /* steps */
} /* join_preparation */
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(not(exists(/* select#2 */ select `t2`.`a` from `t2`)))",
"steps": [
{
"transformation": "equality_propagation",
"subselect_evaluation": [
] /* subselect_evaluation */,
"resulting_condition": "(not(exists(/* select#2 */ select `t2`.`a` from `t2`)))"
},
{
"transformation": "constant_propagation",
"subselect_evaluation": [
] /* subselect_evaluation */,
"resulting_condition": "(not(exists(/* select#2 */ select `t2`.`a` from `t2`)))"
},
{
"transformation": "trivial_condition_removal",
"subselect_evaluation": [
{
"subselect_execution": {
"select#": 2,
"steps": [
{
"join_optimization": {
"select#": 2,
"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": true
}
] /* rows_estimation */
}
] /* steps */,
"empty_result": {
"cause": "no matching row in const table"
} /* empty_result */
} /* join_optimization */
},
{
"join_execution": {
"select#": 2,
"steps": [
] /* steps */
} /* join_execution */
}
] /* steps */
} /* subselect_execution */
}
] /* subselect_evaluation */,
"resulting_condition": null
}
] /* steps */
} /* condition_processing */
}
] /* steps */
} /* join_optimization */
},
{
"join_execution": {
"select#": 1,
"steps": [
] /* steps */
} /* join_execution */
}
] /* steps */
} 0 0
DROP TABLE t1,t2;
#
# BUG#12905521 - ASSERT IN OPT_TRACE_STMT::SYNTAX_ERROR ON SELECT
# DISTINCT/MIN/JOIN/SUBQ QUERY
#
CREATE TABLE t1 (
pk INTEGER,
col_int_nokey INTEGER,
col_int_key INTEGER,
col_varchar_key VARCHAR(1),
col_varchar_nokey VARCHAR(1),
PRIMARY KEY (pk),
KEY (col_varchar_key,col_int_key)
) ENGINE=MYISAM;
CREATE TABLE t2 (
pk INTEGER,
col_int_nokey INTEGER,
col_int_key INTEGER,
col_varchar_key VARCHAR(1),
col_varchar_nokey VARCHAR(1),
PRIMARY KEY (pk),
KEY (col_varchar_key,col_int_key)
) ENGINE=MYISAM;
CREATE TABLE t3 (
pk INTEGER,
col_int_nokey INTEGER,
col_int_key INTEGER,
col_time_key TIME,
col_datetime_nokey DATETIME,
col_varchar_key VARCHAR(1),
col_varchar_nokey VARCHAR(1),
PRIMARY KEY (pk),
KEY (col_time_key),
KEY (col_varchar_key,col_int_key)
) ENGINE=MYISAM;
CREATE TABLE t4 (
pk INTEGER,
col_int_nokey INTEGER,
col_int_key INTEGER,
col_date_key DATE,
col_date_nokey DATE,
col_time_key TIME,
col_time_nokey TIME,
col_datetime_key DATETIME,
col_datetime_nokey DATETIME,
col_varchar_key VARCHAR(1),
col_varchar_nokey VARCHAR(1),
PRIMARY KEY (pk),
KEY (col_varchar_key,col_int_key)
) ENGINE=MYISAM;
INSERT INTO t4 (
col_int_key,col_int_nokey,
col_date_key,col_date_nokey,
col_time_key,col_time_nokey,
col_datetime_key,col_datetime_nokey,
col_varchar_key,col_varchar_nokey
) VALUES
(8,7,'2008-10-02','2008-10-02','04:07:22.028954','04:07:22.028954','2001-10-08 00:00:00','2001-10-08 00:00:00','g','g');
CREATE TABLE t5 (
pk INTEGER AUTO_INCREMENT,
col_int_nokey INTEGER,
col_int_key INTEGER,
col_date_key DATE,
col_date_nokey DATE,
col_time_key TIME,
col_time_nokey TIME,
col_datetime_key DATETIME,
col_datetime_nokey DATETIME,
col_varchar_key VARCHAR(1),
col_varchar_nokey VARCHAR(1),
PRIMARY KEY (pk),
KEY (col_int_key),
KEY (col_varchar_key,col_int_key)
) ENGINE=MYISAM;
INSERT INTO t5 (
col_int_key,col_int_nokey,
col_date_key,col_date_nokey,
col_time_key,col_time_nokey,
col_datetime_key,col_datetime_nokey,
col_varchar_key,col_varchar_nokey
) VALUES
(8,NULL,'2000-12-03','2000-12-03','22:55:23.019225','22:55:23.019225','2005-07-20 00:00:00','2005-07-20 00:00:00','x','x'),
(7,8,'2008-05-03','2008-05-03','10:19:31.050677','10:19:31.050677','2007-10-06 17:56:40.056051','2007-10-06 17:56:40.056051','d','d'),
(8,6,'2000-09-20','2000-09-20','14:11:27.044095','14:11:27.044095','2003-06-13 23:19:49.018300','2003-06-13 23:19:49.018300','c','c');
set @old_opt_switch=@@optimizer_switch;
select distinct
alias1.`col_varchar_key` as field1 ,alias1.`col_date_key` as
field2 ,( select min( sq1_alias1.`col_varchar_nokey` ) as sq1_field1 from ( t1
as sq1_alias1 inner join ( t5 as sq1_alias2 left join t5 as sq1_alias3 on
(sq1_alias3.`col_varchar_nokey` = sq1_alias2.`col_varchar_key` ) ) on
(sq1_alias3.`col_varchar_nokey` = sq1_alias2.`col_varchar_key` ) ) where
exists ( select distinct c_sq1_alias2.`col_int_nokey` as c_sq1_field1 from (
t3 as c_sq1_alias1 right join t4 as c_sq1_alias2 on (c_sq1_alias2.`col_int_nokey` = c_sq1_alias1.`pk` ) ) where
c_sq1_alias2.`col_varchar_key` = sq1_alias2.`col_varchar_nokey` ) ) as field3
,( select max( sq2_alias1.`pk` ) as sq2_field1 from t5 as sq2_alias1 ) as
field4 ,alias2.`col_varchar_nokey` as field5 ,alias2.`col_varchar_nokey` as
field6 from ( t5 as alias1 right outer join ( ( ( select sq3_alias2.* from ( t5 as sq3_alias1 ,t4 as sq3_alias2 ) ) as alias2 right join t4
as alias3 on (alias3.`col_varchar_key` = alias2.`col_varchar_key` ) ) ) on
(alias3.`col_int_key` = alias2.`pk` ) ) where ( alias1.`col_varchar_nokey` in
( select sq4_alias1.`col_varchar_key` as sq4_field1 from ( t3 as sq4_alias1
inner join ( t2 as sq4_alias2 right outer join t3 as sq4_alias3 on
(sq4_alias3.`pk` = sq4_alias2.`col_int_key` ) ) on
(sq4_alias3.`col_varchar_nokey` = sq4_alias2.`col_varchar_key` ) ) where
sq4_alias2.`col_int_key` < alias1.`col_int_nokey` and
sq4_alias3.`col_varchar_nokey` <> alias1.`col_varchar_key` ) ) and
alias1.`col_int_key` not in (214) group by field1,field2,field3,
field4,field5,field6;
field1 field2 field3 field4 field5 field6
select * from information_schema.optimizer_trace;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
select distinct
alias1.`col_varchar_key` as field1 ,alias1.`col_date_key` as
field2 ,( select min( sq1_alias1.`col_varchar_nokey` ) as sq1_field1 from ( t1
as sq1_alias1 inner join ( t5 as sq1_alias2 left join t5 as sq1_alias3 on
(sq1_alias3.`col_varchar_nokey` = sq1_alias2.`col_varchar_key` ) ) on
(sq1_alias3.`col_varchar_nokey` = sq1_alias2.`col_varchar_key` ) ) where
exists ( select distinct c_sq1_alias2.`col_int_nokey` as c_sq1_field1 from (
t3 as c_sq1_alias1 right join t4 as c_sq1_alias2 on (c_sq1_alias2.`col_int_nokey` = c_sq1_alias1.`pk` ) ) where
c_sq1_alias2.`col_varchar_key` = sq1_alias2.`col_varchar_nokey` ) ) as field3
,( select max( sq2_alias1.`pk` ) as sq2_field1 from t5 as sq2_alias1 ) as
field4 ,alias2.`col_varchar_nokey` as field5 ,alias2.`col_varchar_nokey` as
field6 from ( t5 as alias1 right outer join ( ( ( select sq3_alias2.* from ( t5 as sq3_alias1 ,t4 as sq3_alias2 ) ) as alias2 right join t4
as alias3 on (alias3.`col_varchar_key` = alias2.`col_varchar_key` ) ) ) on
(alias3.`col_int_key` = alias2.`pk` ) ) where ( alias1.`col_varchar_nokey` in
( select sq4_alias1.`col_varchar_key` as sq4_field1 from ( t3 as sq4_alias1
inner join ( t2 as sq4_alias2 right outer join t3 as sq4_alias3 on
(sq4_alias3.`pk` = sq4_alias2.`col_int_key` ) ) on
(sq4_alias3.`col_varchar_nokey` = sq4_alias2.`col_varchar_key` ) ) where
sq4_alias2.`col_int_key` < alias1.`col_int_nokey` and
sq4_alias3.`col_varchar_nokey` <> alias1.`col_varchar_key` ) ) and
alias1.`col_int_key` not in (214) group by field1,field2,field3,
field4,field5,field6 {
"steps": [
{
"join_preparation": {
"select#": 5,
"steps": [
{
"expanded_query": "/* select#5 */ select `sq3_alias2`.`pk` AS `pk`,`sq3_alias2`.`col_int_nokey` AS `col_int_nokey`,`sq3_alias2`.`col_int_key` AS `col_int_key`,`sq3_alias2`.`col_date_key` AS `col_date_key`,`sq3_alias2`.`col_date_nokey` AS `col_date_nokey`,`sq3_alias2`.`col_time_key` AS `col_time_key`,`sq3_alias2`.`col_time_nokey` AS `col_time_nokey`,`sq3_alias2`.`col_datetime_key` AS `col_datetime_key`,`sq3_alias2`.`col_datetime_nokey` AS `col_datetime_nokey`,`sq3_alias2`.`col_varchar_key` AS `col_varchar_key`,`sq3_alias2`.`col_varchar_nokey` AS `col_varchar_nokey` from (`t5` `sq3_alias1` join `t4` `sq3_alias2`)"
}
] /* steps */
} /* join_preparation */
},
{
"join_preparation": {
"select#": 1,
"steps": [
{
"join_preparation": {
"select#": 2,
"steps": [
{
"join_preparation": {
"select#": 3,
"steps": [
{
"transformations_to_subquery": [
"removed_distinct"
] /* transformations_to_subquery */
},
{
"expanded_query": "/* select#3 */ select `c_sq1_alias2`.`col_int_nokey` AS `c_sq1_field1` from (`t4` `c_sq1_alias2` left join `t3` `c_sq1_alias1` on((`c_sq1_alias2`.`col_int_nokey` = `c_sq1_alias1`.`pk`))) where (`c_sq1_alias2`.`col_varchar_key` = `sq1_alias2`.`col_varchar_nokey`)"
}
] /* steps */
} /* join_preparation */
},
{
"expanded_query": "/* select#2 */ select min(`sq1_alias1`.`col_varchar_nokey`) AS `sq1_field1` from (`t1` `sq1_alias1` join (`t5` `sq1_alias2` left join `t5` `sq1_alias3` on((`sq1_alias3`.`col_varchar_nokey` = `sq1_alias2`.`col_varchar_key`))) on((`sq1_alias3`.`col_varchar_nokey` = `sq1_alias2`.`col_varchar_key`))) where exists(/* select#3 */ select `c_sq1_alias2`.`col_int_nokey` AS `c_sq1_field1` from (`t4` `c_sq1_alias2` left join `t3` `c_sq1_alias1` on((`c_sq1_alias2`.`col_int_nokey` = `c_sq1_alias1`.`pk`))) where (`c_sq1_alias2`.`col_varchar_key` = `sq1_alias2`.`col_varchar_nokey`))"
}
] /* steps */
} /* join_preparation */
},
{
"join_preparation": {
"select#": 4,
"steps": [
{
"expanded_query": "/* select#4 */ select max(`sq2_alias1`.`pk`) AS `sq2_field1` from `t5` `sq2_alias1`"
}
] /* steps */
} /* join_preparation */
},
{
"join_preparation": {
"select#": 6,
"steps": [
{
"expanded_query": "/* select#6 */ select `sq4_alias1`.`col_varchar_key` AS `sq4_field1` from (`t3` `sq4_alias1` join (`t3` `sq4_alias3` left join `t2` `sq4_alias2` on((`sq4_alias3`.`pk` = `sq4_alias2`.`col_int_key`))) on((`sq4_alias3`.`col_varchar_nokey` = `sq4_alias2`.`col_varchar_key`))) where ((`sq4_alias2`.`col_int_key` < `alias1`.`col_int_nokey`) and (`sq4_alias3`.`col_varchar_nokey` <> `alias1`.`col_varchar_key`))"
},
{
"transformation": {
"select#": 6,
"from": "IN (SELECT)",
"to": "semijoin",
"chosen": false
} /* transformation */
},
{
"transformation": {
"select#": 6,
"from": "IN (SELECT)",
"to": "EXISTS (CORRELATED SELECT)",
"chosen": true,
"evaluating_constant_where_conditions": [
] /* evaluating_constant_where_conditions */
} /* transformation */
}
] /* steps */
} /* join_preparation */
},
{
"expanded_query": "/* select#1 */ select distinct `alias1`.`col_varchar_key` AS `field1`,`alias1`.`col_date_key` AS `field2`,(/* select#2 */ select min(`sq1_alias1`.`col_varchar_nokey`) AS `sq1_field1` from (`t1` `sq1_alias1` join (`t5` `sq1_alias2` left join `t5` `sq1_alias3` on((`sq1_alias3`.`col_varchar_nokey` = `sq1_alias2`.`col_varchar_key`))) on((`sq1_alias3`.`col_varchar_nokey` = `sq1_alias2`.`col_varchar_key`))) where exists(/* select#3 */ select `c_sq1_alias2`.`col_int_nokey` AS `c_sq1_field1` from (`t4` `c_sq1_alias2` left join `t3` `c_sq1_alias1` on((`c_sq1_alias2`.`col_int_nokey` = `c_sq1_alias1`.`pk`))) where (`c_sq1_alias2`.`col_varchar_key` = `sq1_alias2`.`col_varchar_nokey`))) AS `field3`,(/* select#4 */ select max(`sq2_alias1`.`pk`) AS `sq2_field1` from `t5` `sq2_alias1`) AS `field4`,`alias2`.`col_varchar_nokey` AS `field5`,`alias2`.`col_varchar_nokey` AS `field6` from ((`t4` `alias3` left join ((/* select#5 */ select `sq3_alias2`.`pk` AS `pk`,`sq3_alias2`.`col_int_nokey` AS `col_int_nokey`,`sq3_alias2`.`col_int_key` AS `col_int_key`,`sq3_alias2`.`col_date_key` AS `col_date_key`,`sq3_alias2`.`col_date_nokey` AS `col_date_nokey`,`sq3_alias2`.`col_time_key` AS `col_time_key`,`sq3_alias2`.`col_time_nokey` AS `col_time_nokey`,`sq3_alias2`.`col_datetime_key` AS `col_datetime_key`,`sq3_alias2`.`col_datetime_nokey` AS `col_datetime_nokey`,`sq3_alias2`.`col_varchar_key` AS `col_varchar_key`,`sq3_alias2`.`col_varchar_nokey` AS `col_varchar_nokey` from (`t5` `sq3_alias1` join `t4` `sq3_alias2`))) `alias2` on((`alias3`.`col_varchar_key` = `alias2`.`col_varchar_key`))) left join `t5` `alias1` on((`alias3`.`col_int_key` = `alias2`.`pk`))) where (<in_optimizer>(`alias1`.`col_varchar_nokey`,<exists>(/* select#6 */ select `sq4_alias1`.`col_varchar_key` AS `sq4_field1` from (`t3` `sq4_alias1` join (`t3` `sq4_alias3` left join `t2` `sq4_alias2` on((`sq4_alias3`.`pk` = `sq4_alias2`.`col_int_key`))) on((`sq4_alias3`.`col_varchar_nokey` = `sq4_alias2`.`col_varchar_key`))) where ((`sq4_alias2`.`col_int_key` < `alias1`.`col_int_nokey`) and (`sq4_alias3`.`col_varchar_nokey` <> `alias1`.`col_varchar_key`) and (<cache>(`alias1`.`col_varchar_nokey`) = `sq4_alias1`.`col_varchar_key`)))) and (`alias1`.`col_int_key` <> 214)) group by `field1`,`field2`,`field3`,`field4`,`field5`,`field6`"
}
] /* steps */
} /* join_preparation */
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"join_optimization": {
"select#": 5,
"steps": [
{
"transformations_to_nested_joins": {
"transformations": [
"parenthesis_removal"
] /* transformations */,
"expanded_query": "/* select#5 */ select `sq3_alias2`.`pk` AS `pk`,`sq3_alias2`.`col_int_nokey` AS `col_int_nokey`,`sq3_alias2`.`col_int_key` AS `col_int_key`,`sq3_alias2`.`col_date_key` AS `col_date_key`,`sq3_alias2`.`col_date_nokey` AS `col_date_nokey`,`sq3_alias2`.`col_time_key` AS `col_time_key`,`sq3_alias2`.`col_time_nokey` AS `col_time_nokey`,`sq3_alias2`.`col_datetime_key` AS `col_datetime_key`,`sq3_alias2`.`col_datetime_nokey` AS `col_datetime_nokey`,`sq3_alias2`.`col_varchar_key` AS `col_varchar_key`,`sq3_alias2`.`col_varchar_nokey` AS `col_varchar_nokey` from `t5` `sq3_alias1` join `t4` `sq3_alias2`"
} /* transformations_to_nested_joins */
},
{
"table_dependencies": [
{
"table": "`t5` `sq3_alias1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
] /* depends_on_map_bits */
},
{
"table": "`t4` `sq3_alias2`",
"row_may_be_null": false,
"map_bit": 1,
"depends_on_map_bits": [
] /* depends_on_map_bits */
}
] /* table_dependencies */
},
{
"rows_estimation": [
{
"table": "`t5` `sq3_alias1`",
"table_scan": {
"rows": 3,
"cost": 2
} /* table_scan */
},
{
"table": "`t4` `sq3_alias2`",
"rows": 1,
"cost": 1,
"table_type": "system",
"empty": false
}
] /* rows_estimation */
},
{
"considered_execution_plans": [
{
"plan_prefix": [
"`t4` `sq3_alias2`"
] /* plan_prefix */,
"table": "`t5` `sq3_alias1`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "scan",
"rows": 3,
"cost": 2.6342,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 2.6342,
"rows_for_plan": 3,
"chosen": true
}
] /* considered_execution_plans */
},
{
"attaching_conditions_to_tables": {
"original_condition": null,
"attached_conditions_computation": [
] /* attached_conditions_computation */,
"attached_conditions_summary": [
{
"table": "`t5` `sq3_alias1`",
"attached": null
}
] /* attached_conditions_summary */
} /* attaching_conditions_to_tables */
},
{
"refine_plan": [
{
"table": "`t5` `sq3_alias1`",
"access_type": "index_scan"
}
] /* refine_plan */
}
] /* steps */
} /* join_optimization */
},
{
"transformations_to_nested_joins": {
"transformations": [
"outer_join_to_inner_join",
"JOIN_condition_to_WHERE",
"parenthesis_removal"
] /* transformations */,
"expanded_query": "/* select#1 */ select distinct `alias1`.`col_varchar_key` AS `field1`,`alias1`.`col_date_key` AS `field2`,(/* select#2 */ select min(`sq1_alias1`.`col_varchar_nokey`) AS `sq1_field1` from (`t1` `sq1_alias1` join (`t5` `sq1_alias2` left join `t5` `sq1_alias3` on((`sq1_alias3`.`col_varchar_nokey` = `sq1_alias2`.`col_varchar_key`))) on((`sq1_alias3`.`col_varchar_nokey` = `sq1_alias2`.`col_varchar_key`))) where exists(/* select#3 */ select `c_sq1_alias2`.`col_int_nokey` AS `c_sq1_field1` from (`t4` `c_sq1_alias2` left join `t3` `c_sq1_alias1` on((`c_sq1_alias2`.`col_int_nokey` = `c_sq1_alias1`.`pk`))) where (`c_sq1_alias2`.`col_varchar_key` = `sq1_alias2`.`col_varchar_nokey`))) AS `field3`,(/* select#4 */ select max(`sq2_alias1`.`pk`) AS `sq2_field1` from `t5` `sq2_alias1`) AS `field4`,`alias2`.`col_varchar_nokey` AS `field5`,`alias2`.`col_varchar_nokey` AS `field6` from `t4` `alias3` join ((/* select#5 */ select '0' AS `pk`,'7' AS `col_int_nokey`,'8' AS `col_int_key`,'2008-10-02' AS `col_date_key`,'2008-10-02' AS `col_date_nokey`,'04:07:22' AS `col_time_key`,'04:07:22' AS `col_time_nokey`,'2001-10-08 00:00:00' AS `col_datetime_key`,'2001-10-08 00:00:00' AS `col_datetime_nokey`,'g' AS `col_varchar_key`,'g' AS `col_varchar_nokey` from `t5` `sq3_alias1`)) `alias2` join `t5` `alias1` where (<in_optimizer>(`alias1`.`col_varchar_nokey`,<exists>(/* select#6 */ select `sq4_alias1`.`col_varchar_key` AS `sq4_field1` from (`t3` `sq4_alias1` join (`t3` `sq4_alias3` left join `t2` `sq4_alias2` on((`sq4_alias3`.`pk` = `sq4_alias2`.`col_int_key`))) on((`sq4_alias3`.`col_varchar_nokey` = `sq4_alias2`.`col_varchar_key`))) where ((`sq4_alias2`.`col_int_key` < `alias1`.`col_int_nokey`) and (`sq4_alias3`.`col_varchar_nokey` <> `alias1`.`col_varchar_key`) and (<cache>(`alias1`.`col_varchar_nokey`) = `sq4_alias1`.`col_varchar_key`)))) and (`alias1`.`col_int_key` <> 214) and (`alias3`.`col_int_key` = `alias2`.`pk`) and (`alias3`.`col_varchar_key` = `alias2`.`col_varchar_key`)) group by `field1`,`field2`,`field3`,`field4`,`field5`,`field6`"
} /* transformations_to_nested_joins */
},
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(<in_optimizer>(`alias1`.`col_varchar_nokey`,<exists>(/* select#6 */ select `sq4_alias1`.`col_varchar_key` AS `sq4_field1` from (`t3` `sq4_alias1` join (`t3` `sq4_alias3` left join `t2` `sq4_alias2` on((`sq4_alias3`.`pk` = `sq4_alias2`.`col_int_key`))) on((`sq4_alias3`.`col_varchar_nokey` = `sq4_alias2`.`col_varchar_key`))) where ((`sq4_alias2`.`col_int_key` < `alias1`.`col_int_nokey`) and (`sq4_alias3`.`col_varchar_nokey` <> `alias1`.`col_varchar_key`) and (<cache>(`alias1`.`col_varchar_nokey`) = `sq4_alias1`.`col_varchar_key`)))) and (`alias1`.`col_int_key` <> 214) and (`alias3`.`col_int_key` = `alias2`.`pk`) and (`alias3`.`col_varchar_key` = `alias2`.`col_varchar_key`))",
"steps": [
{
"transformation": "equality_propagation",
"subselect_evaluation": [
] /* subselect_evaluation */,
"resulting_condition": "(<in_optimizer>(`alias1`.`col_varchar_nokey`,<exists>(/* select#6 */ select `sq4_alias1`.`col_varchar_key` AS `sq4_field1` from (`t3` `sq4_alias1` join (`t3` `sq4_alias3` left join `t2` `sq4_alias2` on((`sq4_alias3`.`pk` = `sq4_alias2`.`col_int_key`))) on((`sq4_alias3`.`col_varchar_nokey` = `sq4_alias2`.`col_varchar_key`))) where ((`sq4_alias2`.`col_int_key` < `alias1`.`col_int_nokey`) and (`sq4_alias3`.`col_varchar_nokey` <> `alias1`.`col_varchar_key`) and (<cache>(`alias1`.`col_varchar_nokey`) = `sq4_alias1`.`col_varchar_key`)))) and (`alias1`.`col_int_key` <> 214) and multiple equal(`alias3`.`col_int_key`, `alias2`.`pk`) and multiple equal(`alias3`.`col_varchar_key`, `alias2`.`col_varchar_key`))"
},
{
"transformation": "constant_propagation",
"subselect_evaluation": [
] /* subselect_evaluation */,
"resulting_condition": "(<in_optimizer>(`alias1`.`col_varchar_nokey`,<exists>(/* select#6 */ select `sq4_alias1`.`col_varchar_key` AS `sq4_field1` from (`t3` `sq4_alias1` join (`t3` `sq4_alias3` left join `t2` `sq4_alias2` on((`sq4_alias3`.`pk` = `sq4_alias2`.`col_int_key`))) on((`sq4_alias3`.`col_varchar_nokey` = `sq4_alias2`.`col_varchar_key`))) where ((`sq4_alias2`.`col_int_key` < `alias1`.`col_int_nokey`) and (`sq4_alias3`.`col_varchar_nokey` <> `alias1`.`col_varchar_key`) and (<cache>(`alias1`.`col_varchar_nokey`) = `sq4_alias1`.`col_varchar_key`)))) and (`alias1`.`col_int_key` <> 214) and multiple equal(`alias3`.`col_int_key`, `alias2`.`pk`) and multiple equal(`alias3`.`col_varchar_key`, `alias2`.`col_varchar_key`))"
},
{
"transformation": "trivial_condition_removal",
"subselect_evaluation": [
] /* subselect_evaluation */,
"resulting_condition": "(<in_optimizer>(`alias1`.`col_varchar_nokey`,<exists>(/* select#6 */ select `sq4_alias1`.`col_varchar_key` AS `sq4_field1` from (`t3` `sq4_alias1` join (`t3` `sq4_alias3` left join `t2` `sq4_alias2` on((`sq4_alias3`.`pk` = `sq4_alias2`.`col_int_key`))) on((`sq4_alias3`.`col_varchar_nokey` = `sq4_alias2`.`col_varchar_key`))) where ((`sq4_alias2`.`col_int_key` < `alias1`.`col_int_nokey`) and (`sq4_alias3`.`col_varchar_nokey` <> `alias1`.`col_varchar_key`) and (<cache>(`alias1`.`col_varchar_nokey`) = `sq4_alias1`.`col_varchar_key`)))) and (`alias1`.`col_int_key` <> 214) and multiple equal(`alias3`.`col_int_key`, `alias2`.`pk`) and multiple equal(`alias3`.`col_varchar_key`, `alias2`.`col_varchar_key`))"
}
] /* steps */
} /* condition_processing */
},
{
"table_dependencies": [
{
"table": "`t5` `alias1`",
"row_may_be_null": true,
"map_bit": 0,
"depends_on_map_bits": [
] /* depends_on_map_bits */
},
{
"table": " `alias2`",
"row_may_be_null": true,
"map_bit": 1,
"depends_on_map_bits": [
] /* depends_on_map_bits */
},
{
"table": "`t4` `alias3`",
"row_may_be_null": false,
"map_bit": 2,
"depends_on_map_bits": [
] /* depends_on_map_bits */
}
] /* table_dependencies */
},
{
"ref_optimizer_key_uses": [
{
"table": " `alias2`",
"field": "pk",
"equals": "`alias3`.`col_int_key`",
"null_rejecting": true
},
{
"table": " `alias2`",
"field": "col_varchar_key",
"equals": "`alias3`.`col_varchar_key`",
"null_rejecting": true
},
{
"table": " `alias2`",
"field": "pk",
"equals": "`alias3`.`col_int_key`",
"null_rejecting": true
},
{
"table": " `alias2`",
"field": "col_varchar_key",
"equals": "`alias3`.`col_varchar_key`",
"null_rejecting": true
},
{
"table": "`t4` `alias3`",
"field": "col_varchar_key",
"equals": "`alias2`.`col_varchar_key`",
"null_rejecting": true
},
{
"table": "`t4` `alias3`",
"field": "col_int_key",
"equals": "`alias2`.`pk`",
"null_rejecting": true
}
] /* ref_optimizer_key_uses */
},
{
"rows_estimation": [
{
"table": "`t5` `alias1`",
"range_analysis": {
"table_scan": {
"rows": 3,
"cost": 4.7342
} /* table_scan */,
"potential_range_indices": [
{
"index": "PRIMARY",
"usable": false,
"cause": "not_applicable"
},
{
"index": "col_int_key",
"usable": true,
"key_parts": [
"col_int_key"
] /* key_parts */
},
{
"index": "col_varchar_key",
"usable": false,
"cause": "not_applicable"
}
] /* potential_range_indices */,
"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",
"ranges": [
"NULL < col_int_key < 214",
"214 < col_int_key"
] /* ranges */,
"index_dives_for_eq_ranges": true,
"rowid_ordered": false,
"using_mrr": false,
"index_only": false,
"rows": 3,
"cost": 5.61,
"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 */
},
{
"table": " `alias2`"
},
{
"table": "`t4` `alias3`",
"rows": 1,
"cost": 1,
"table_type": "system",
"empty": false
}
] /* rows_estimation */
},
{
"considered_execution_plans": [
{
"plan_prefix": [
"`t4` `alias3`"
] /* plan_prefix */,
"table": "`t5` `alias1`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "scan",
"rows": 3,
"cost": 2.6342,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 2.6342,
"rows_for_plan": 3,
"rest_of_plan": [
{
"plan_prefix": [
"`t4` `alias3`",
"`t5` `alias1`"
] /* plan_prefix */,
"table": " `alias2`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "<auto_key0>",
"rows": 0.3,
"cost": 0.96,
"chosen": true
},
{
"access_type": "ref",
"index": "<auto_key1>",
"rows": 0.3,
"cost": 0.96,
"chosen": false
},
{
"access_type": "scan",
"cost": 10.6,
"rows": 3,
"cause": "cost",
"chosen": false
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 3.7142,
"rows_for_plan": 0.9,
"chosen": true
}
] /* rest_of_plan */
},
{
"plan_prefix": [
"`t4` `alias3`"
] /* plan_prefix */,
"table": " `alias2`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "<auto_key0>",
"rows": 0.3,
"cost": 0.36,
"chosen": true
},
{
"access_type": "ref",
"index": "<auto_key1>",
"rows": 0.3,
"cost": 0.36,
"chosen": false
},
{
"access_type": "scan",
"cost": 10.6,
"rows": 3,
"cause": "cost",
"chosen": false
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 0.36,
"rows_for_plan": 0.3,
"rest_of_plan": [
{
"plan_prefix": [
"`t4` `alias3`",
" `alias2`"
] /* plan_prefix */,
"table": "`t5` `alias1`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "scan",
"using_join_cache": true,
"rows": 3,
"cost": 2.2143,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 2.5743,
"rows_for_plan": 0.9,
"chosen": true
}
] /* rest_of_plan */
}
] /* considered_execution_plans */
},
{
"attaching_conditions_to_tables": {
"original_condition": "((`alias2`.`col_varchar_key` = 'g') and (`alias2`.`pk` = '8') and <in_optimizer>(`alias1`.`col_varchar_nokey`,<exists>(/* select#6 */ select `sq4_alias1`.`col_varchar_key` AS `sq4_field1` from (`t3` `sq4_alias1` join (`t3` `sq4_alias3` left join `t2` `sq4_alias2` on((`sq4_alias3`.`pk` = `sq4_alias2`.`col_int_key`))) on((`sq4_alias3`.`col_varchar_nokey` = `sq4_alias2`.`col_varchar_key`))) where ((`sq4_alias2`.`col_int_key` < `alias1`.`col_int_nokey`) and (`sq4_alias3`.`col_varchar_nokey` <> `alias1`.`col_varchar_key`) and (<cache>(`alias1`.`col_varchar_nokey`) = `sq4_alias1`.`col_varchar_key`)))) and (`alias1`.`col_int_key` <> 214))",
"attached_conditions_computation": [
] /* attached_conditions_computation */,
"attached_conditions_summary": [
{
"table": " `alias2`",
"attached": null
},
{
"table": "`t5` `alias1`",
"attached": "(<in_optimizer>(`alias1`.`col_varchar_nokey`,<exists>(/* select#6 */ select `sq4_alias1`.`col_varchar_key` AS `sq4_field1` from (`t3` `sq4_alias1` join (`t3` `sq4_alias3` left join `t2` `sq4_alias2` on((`sq4_alias3`.`pk` = `sq4_alias2`.`col_int_key`))) on((`sq4_alias3`.`col_varchar_nokey` = `sq4_alias2`.`col_varchar_key`))) where ((`sq4_alias2`.`col_int_key` < `alias1`.`col_int_nokey`) and (`sq4_alias3`.`col_varchar_nokey` <> `alias1`.`col_varchar_key`) and (<cache>(`alias1`.`col_varchar_nokey`) = `sq4_alias1`.`col_varchar_key`)))) and (`alias1`.`col_int_key` <> 214))"
}
] /* attached_conditions_summary */
} /* attaching_conditions_to_tables */
},
{
"clause_processing": {
"clause": "GROUP BY",
"original_clause": "`field1`,`field2`,`field3`,`field4`,`field5`,`field6`",
"items": [
{
"item": "`alias1`.`col_varchar_key`"
},
{
"item": "`alias1`.`col_date_key`"
},
{
"item": "(/* select#2 */ select min(`sq1_alias1`.`col_varchar_nokey`) AS `sq1_field1` from (`t1` `sq1_alias1` join (`t5` `sq1_alias2` left join `t5` `sq1_alias3` on((`sq1_alias3`.`col_varchar_nokey` = `sq1_alias2`.`col_varchar_key`))) on((`sq1_alias3`.`col_varchar_nokey` = `sq1_alias2`.`col_varchar_key`))) where exists(/* select#3 */ select `c_sq1_alias2`.`col_int_nokey` AS `c_sq1_field1` from (`t4` `c_sq1_alias2` left join `t3` `c_sq1_alias1` on((`c_sq1_alias2`.`col_int_nokey` = `c_sq1_alias1`.`pk`))) where (`c_sq1_alias2`.`col_varchar_key` = `sq1_alias2`.`col_varchar_nokey`)))",
"subselect_evaluation": [
{
"subselect_execution": {
"select#": 2,
"steps": [
{
"join_optimization": {
"select#": 2,
"steps": [
{
"transformations_to_nested_joins": {
"transformations": [
"outer_join_to_inner_join",
"JOIN_condition_to_WHERE",
"parenthesis_removal"
] /* transformations */,
"expanded_query": "/* select#2 */ select min(`sq1_alias1`.`col_varchar_nokey`) AS `sq1_field1` from `t1` `sq1_alias1` join `t5` `sq1_alias2` join `t5` `sq1_alias3` where (exists(/* select#3 */ select `c_sq1_alias2`.`col_int_nokey` AS `c_sq1_field1` from (`t4` `c_sq1_alias2` left join `t3` `c_sq1_alias1` on((`c_sq1_alias2`.`col_int_nokey` = `c_sq1_alias1`.`pk`))) where (`c_sq1_alias2`.`col_varchar_key` = `sq1_alias2`.`col_varchar_nokey`)) and (`sq1_alias3`.`col_varchar_nokey` = `sq1_alias2`.`col_varchar_key`) and (`sq1_alias3`.`col_varchar_nokey` = `sq1_alias2`.`col_varchar_key`))"
} /* transformations_to_nested_joins */
},
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(exists(/* select#3 */ select `c_sq1_alias2`.`col_int_nokey` AS `c_sq1_field1` from (`t4` `c_sq1_alias2` left join `t3` `c_sq1_alias1` on((`c_sq1_alias2`.`col_int_nokey` = `c_sq1_alias1`.`pk`))) where (`c_sq1_alias2`.`col_varchar_key` = `sq1_alias2`.`col_varchar_nokey`)) and (`sq1_alias3`.`col_varchar_nokey` = `sq1_alias2`.`col_varchar_key`) and (`sq1_alias3`.`col_varchar_nokey` = `sq1_alias2`.`col_varchar_key`))",
"steps": [
{
"transformation": "equality_propagation",
"subselect_evaluation": [
] /* subselect_evaluation */,
"resulting_condition": "(exists(/* select#3 */ select `c_sq1_alias2`.`col_int_nokey` AS `c_sq1_field1` from (`t4` `c_sq1_alias2` left join `t3` `c_sq1_alias1` on((`c_sq1_alias2`.`col_int_nokey` = `c_sq1_alias1`.`pk`))) where (`c_sq1_alias2`.`col_varchar_key` = `sq1_alias2`.`col_varchar_nokey`)) and multiple equal(`sq1_alias3`.`col_varchar_nokey`, `sq1_alias2`.`col_varchar_key`))"
},
{
"transformation": "constant_propagation",
"subselect_evaluation": [
] /* subselect_evaluation */,
"resulting_condition": "(exists(/* select#3 */ select `c_sq1_alias2`.`col_int_nokey` AS `c_sq1_field1` from (`t4` `c_sq1_alias2` left join `t3` `c_sq1_alias1` on((`c_sq1_alias2`.`col_int_nokey` = `c_sq1_alias1`.`pk`))) where (`c_sq1_alias2`.`col_varchar_key` = `sq1_alias2`.`col_varchar_nokey`)) and multiple equal(`sq1_alias3`.`col_varchar_nokey`, `sq1_alias2`.`col_varchar_key`))"
},
{
"transformation": "trivial_condition_removal",
"subselect_evaluation": [
] /* subselect_evaluation */,
"resulting_condition": "(exists(/* select#3 */ select `c_sq1_alias2`.`col_int_nokey` AS `c_sq1_field1` from (`t4` `c_sq1_alias2` left join `t3` `c_sq1_alias1` on((`c_sq1_alias2`.`col_int_nokey` = `c_sq1_alias1`.`pk`))) where (`c_sq1_alias2`.`col_varchar_key` = `sq1_alias2`.`col_varchar_nokey`)) and multiple equal(`sq1_alias3`.`col_varchar_nokey`, `sq1_alias2`.`col_varchar_key`))"
}
] /* steps */
} /* condition_processing */
},
{
"table_dependencies": [
{
"table": "`t1` `sq1_alias1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
] /* depends_on_map_bits */
},
{
"table": "`t5` `sq1_alias2`",
"row_may_be_null": false,
"map_bit": 1,
"depends_on_map_bits": [
] /* depends_on_map_bits */
},
{
"table": "`t5` `sq1_alias3`",
"row_may_be_null": true,
"map_bit": 2,
"depends_on_map_bits": [
] /* depends_on_map_bits */
}
] /* table_dependencies */
},
{
"ref_optimizer_key_uses": [
{
"table": "`t5` `sq1_alias2`",
"field": "col_varchar_key",
"equals": "`sq1_alias3`.`col_varchar_nokey`",
"null_rejecting": true
}
] /* ref_optimizer_key_uses */
},
{
"rows_estimation": [
{
"table": "`t1` `sq1_alias1`",
"rows": 1,
"cost": 1,
"table_type": "system",
"empty": true
},
{
"table": "`t5` `sq1_alias2`",
"table_scan": {
"rows": 3,
"cost": 2
} /* table_scan */
},
{
"table": "`t5` `sq1_alias3`",
"table_scan": {
"rows": 3,
"cost": 2
} /* table_scan */
}
] /* rows_estimation */
},
{
"considered_execution_plans": [
{
"plan_prefix": [
"`t1` `sq1_alias1`"
] /* plan_prefix */,
"table": "`t5` `sq1_alias3`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "scan",
"rows": 3,
"cost": 2.6342,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 2.6342,
"rows_for_plan": 3,
"rest_of_plan": [
{
"plan_prefix": [
"`t1` `sq1_alias1`",
"`t5` `sq1_alias3`"
] /* plan_prefix */,
"table": "`t5` `sq1_alias2`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "col_varchar_key",
"rows": 1,
"cost": 4.1,
"chosen": true
},
{
"access_type": "scan",
"using_join_cache": true,
"rows": 3,
"cost": 3.8343,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 6.4685,
"rows_for_plan": 9,
"chosen": true
}
] /* rest_of_plan */
},
{
"plan_prefix": [
"`t1` `sq1_alias1`"
] /* plan_prefix */,
"table": "`t5` `sq1_alias2`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "col_varchar_key",
"usable": false,
"chosen": false
},
{
"access_type": "scan",
"rows": 3,
"cost": 2.6342,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 2.6342,
"rows_for_plan": 3,
"pruned_by_heuristic": true
}
] /* considered_execution_plans */
}
] /* steps */,
"empty_result": {
"cause": "no matching row in const table"
} /* empty_result */
} /* join_optimization */
},
{
"join_execution": {
"select#": 2,
"steps": [
] /* steps */
} /* join_execution */
}
] /* steps */
} /* subselect_execution */
}
] /* subselect_evaluation */,
"uses_only_constant_tables": true
},
{
"item": "(/* select#4 */ select max(`sq2_alias1`.`pk`) AS `sq2_field1` from `t5` `sq2_alias1`)",
"subselect_evaluation": [
{
"subselect_execution": {
"select#": 4,
"steps": [
{
"join_optimization": {
"select#": 4,
"steps": [
] /* steps */,
"empty_result": {
"cause": "Select tables optimized away"
} /* empty_result */
} /* join_optimization */
},
{
"join_execution": {
"select#": 4,
"steps": [
] /* steps */
} /* join_execution */
}
] /* steps */
} /* subselect_execution */
}
] /* subselect_evaluation */,
"uses_only_constant_tables": true
},
{
"item": "`alias2`.`col_varchar_nokey`"
},
{
"item": "`alias2`.`col_varchar_nokey`",
"duplicate_item": true
}
] /* items */,
"resulting_clause_is_simple": false,
"resulting_clause": "`field1`,`field2`,`field5`"
} /* clause_processing */
},
{
"refine_plan": [
{
"table": " `alias2`"
},
{
"table": "`t5` `alias1`",
"access_type": "table_scan"
}
] /* refine_plan */
}
] /* steps */
} /* join_optimization */
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"creating_tmp_table": {
"tmp_table_info": {
"table": " `alias2`",
"row_length": 40,
"key_length": 8,
"unique_constraint": false,
"location": "memory (heap)",
"row_limit_estimate": 26214
} /* tmp_table_info */
} /* creating_tmp_table */
},
{
"join_execution": {
"select#": 5,
"steps": [
] /* steps */
} /* join_execution */
},
{
"creating_tmp_table": {
"tmp_table_info": {
"table": "intermediate_tmp_table",
"row_length": 13,
"key_length": 12,
"unique_constraint": false,
"location": "memory (heap)",
"row_limit_estimate": 80659
} /* tmp_table_info */
} /* creating_tmp_table */
},
{
"filesort_information": [
{
"direction": "asc",
"table": "intermediate_tmp_table",
"field": "col_varchar_key"
},
{
"direction": "asc",
"table": "intermediate_tmp_table",
"field": "col_date_key"
},
{
"direction": "asc",
"table": "intermediate_tmp_table",
"field": "col_varchar_nokey"
}
] /* filesort_information */,
"filesort_priority_queue_optimization": {
"usable": false,
"cause": "not applicable (no LIMIT)"
} /* filesort_priority_queue_optimization */,
"filesort_execution": [
] /* filesort_execution */,
"filesort_summary": {
"rows": 0,
"examined_rows": 0,
"number_of_tmp_files": 0,
"sort_buffer_size": "NNN",
"sort_mode": "<sort_key, rowid>"
} /* filesort_summary */
}
] /* steps */
} /* join_execution */
}
] /* steps */
} 0 0
set optimizer_switch=@old_opt_switch;
drop table t1,t2,t3,t4,t5;
#
# BUG#12905758 - ASSERT IN OPT_TRACE_STMT::SYNTAX_ERROR ON
# SELECT/SUBQ/SUM QUERY
#
CREATE TABLE t1 (
pk INTEGER AUTO_INCREMENT,
col_int_nokey INTEGER,
col_int_key INTEGER,
col_date_key DATE,
col_date_nokey DATE,
col_time_key TIME,
col_time_nokey TIME,
col_datetime_key DATETIME,
col_datetime_nokey DATETIME,
col_varchar_key VARCHAR(1),
col_varchar_nokey VARCHAR(1),
PRIMARY KEY (pk),
KEY (col_varchar_key,col_int_key)
) ENGINE=MYISAM;
INSERT INTO t1 (
col_int_key,col_int_nokey,
col_date_key,col_date_nokey,
col_time_key,col_time_nokey,
col_datetime_key,col_datetime_nokey,
col_varchar_key,col_varchar_nokey
) VALUES
(8,NULL,'2000-12-03','2000-12-03','22:55:23.019225','22:55:23.019225','2005-07-20 00:00:00','2005-07-20 00:00:00','x','x'),
(8,6,'2000-09-20','2000-09-20','14:11:27.044095','14:11:27.044095','2003-06-13 23:19:49.018300','2003-06-13 23:19:49.018300','c','c');
CREATE TABLE t2 (I INTEGER);
select ( select sum( subquery1_t1.`col_int_nokey` ) as subquery1_field1 from
t1 as subquery1_t1 ) as field1 from ( t1 as table1 straight_join t1 as table2
on (table2.`col_varchar_key` = table1.`col_varchar_key` ) ) where (
table2.`col_int_nokey` <> any ( select 5 from t2 ) ) and table1.`pk` in
(192,18) order by field1 desc;
field1
select * from information_schema.optimizer_trace;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
select ( select sum( subquery1_t1.`col_int_nokey` ) as subquery1_field1 from
t1 as subquery1_t1 ) as field1 from ( t1 as table1 straight_join t1 as table2
on (table2.`col_varchar_key` = table1.`col_varchar_key` ) ) where (
table2.`col_int_nokey` <> any ( select 5 from t2 ) ) and table1.`pk` in
(192,18) order by field1 desc {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"join_preparation": {
"select#": 2,
"steps": [
{
"expanded_query": "/* select#2 */ select sum(`subquery1_t1`.`col_int_nokey`) AS `subquery1_field1` from `t1` `subquery1_t1`"
}
] /* steps */
} /* join_preparation */
},
{
"join_preparation": {
"select#": 3,
"steps": [
{
"expanded_query": "/* select#3 */ select 5 from `t2`"
},
{
"transformation": {
"select#": 3,
"from": "IN (SELECT)",
"to": "EXISTS (CORRELATED SELECT)",
"chosen": true,
"evaluating_constant_where_conditions": [
] /* evaluating_constant_where_conditions */
} /* transformation */
}
] /* steps */
} /* join_preparation */
},
{
"expanded_query": "/* select#1 */ select (/* select#2 */ select sum(`subquery1_t1`.`col_int_nokey`) AS `subquery1_field1` from `t1` `subquery1_t1`) AS `field1` from (`t1` `table1` straight_join `t1` `table2` on((`table2`.`col_varchar_key` = `table1`.`col_varchar_key`))) where (<nop>(<in_optimizer>(`table2`.`col_int_nokey`,<exists>(/* select#3 */ select 5 from `t2` where <if>(outer_field_is_not_null, (<cache>(`table2`.`col_int_nokey`) <> 5), true)))) and (`table1`.`pk` in (192,18))) order by `field1` desc"
}
] /* steps */
} /* join_preparation */
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"transformations_to_nested_joins": {
"transformations": [
"JOIN_condition_to_WHERE",
"parenthesis_removal"
] /* transformations */,
"expanded_query": "/* select#1 */ select (/* select#2 */ select sum(`subquery1_t1`.`col_int_nokey`) AS `subquery1_field1` from `t1` `subquery1_t1`) AS `field1` from `t1` `table1` straight_join `t1` `table2` where (<nop>(<in_optimizer>(`table2`.`col_int_nokey`,<exists>(/* select#3 */ select 5 from `t2` where <if>(outer_field_is_not_null, (<cache>(`table2`.`col_int_nokey`) <> 5), true)))) and (`table1`.`pk` in (192,18)) and (`table2`.`col_varchar_key` = `table1`.`col_varchar_key`)) order by `field1` desc"
} /* transformations_to_nested_joins */
},
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(<nop>(<in_optimizer>(`table2`.`col_int_nokey`,<exists>(/* select#3 */ select 5 from `t2` where <if>(outer_field_is_not_null, (<cache>(`table2`.`col_int_nokey`) <> 5), true)))) and (`table1`.`pk` in (192,18)) and (`table2`.`col_varchar_key` = `table1`.`col_varchar_key`))",
"steps": [
{
"transformation": "equality_propagation",
"subselect_evaluation": [
] /* subselect_evaluation */,
"resulting_condition": "(<nop>(<in_optimizer>(`table2`.`col_int_nokey`,<exists>(/* select#3 */ select 5 from `t2` where <if>(outer_field_is_not_null, (<cache>(`table2`.`col_int_nokey`) <> 5), true)))) and (`table1`.`pk` in (192,18)) and multiple equal(`table2`.`col_varchar_key`, `table1`.`col_varchar_key`))"
},
{
"transformation": "constant_propagation",
"subselect_evaluation": [
] /* subselect_evaluation */,
"resulting_condition": "(<nop>(<in_optimizer>(`table2`.`col_int_nokey`,<exists>(/* select#3 */ select 5 from `t2` where <if>(outer_field_is_not_null, (<cache>(`table2`.`col_int_nokey`) <> 5), true)))) and (`table1`.`pk` in (192,18)) and multiple equal(`table2`.`col_varchar_key`, `table1`.`col_varchar_key`))"
},
{
"transformation": "trivial_condition_removal",
"subselect_evaluation": [
] /* subselect_evaluation */,
"resulting_condition": "(<nop>(<in_optimizer>(`table2`.`col_int_nokey`,<exists>(/* select#3 */ select 5 from `t2` where <if>(outer_field_is_not_null, (<cache>(`table2`.`col_int_nokey`) <> 5), true)))) and (`table1`.`pk` in (192,18)) and multiple equal(`table2`.`col_varchar_key`, `table1`.`col_varchar_key`))"
}
] /* steps */
} /* condition_processing */
},
{
"table_dependencies": [
{
"table": "`t1` `table1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
] /* depends_on_map_bits */
},
{
"table": "`t1` `table2`",
"row_may_be_null": false,
"map_bit": 1,
"depends_on_map_bits": [
0
] /* depends_on_map_bits */
}
] /* table_dependencies */
},
{
"ref_optimizer_key_uses": [
{
"table": "`t1` `table1`",
"field": "col_varchar_key",
"equals": "`table2`.`col_varchar_key`",
"null_rejecting": true
},
{
"table": "`t1` `table2`",
"field": "col_varchar_key",
"equals": "`table1`.`col_varchar_key`",
"null_rejecting": true
}
] /* ref_optimizer_key_uses */
},
{
"rows_estimation": [
{
"table": "`t1` `table1`",
"range_analysis": {
"table_scan": {
"rows": 2,
"cost": 4.5225
} /* table_scan */,
"potential_range_indices": [
{
"index": "PRIMARY",
"usable": true,
"key_parts": [
"pk"
] /* key_parts */
},
{
"index": "col_varchar_key",
"usable": false,
"cause": "not_applicable"
}
] /* potential_range_indices */,
"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": "PRIMARY",
"ranges": [
"18 <= pk <= 18",
"192 <= pk <= 192"
] /* ranges */,
"index_dives_for_eq_ranges": true,
"rowid_ordered": false,
"using_mrr": false,
"index_only": false,
"rows": 2,
"cost": 4.41,
"chosen": true
}
] /* range_scan_alternatives */,
"analyzing_roworder_intersect": {
"usable": false,
"cause": "too_few_roworder_scans"
} /* analyzing_roworder_intersect */
} /* analyzing_range_alternatives */,
"chosen_range_access_summary": {
"range_access_plan": {
"type": "range_scan",
"index": "PRIMARY",
"rows": 2,
"ranges": [
"18 <= pk <= 18",
"192 <= pk <= 192"
] /* ranges */
} /* range_access_plan */,
"rows_for_plan": 2,
"cost_for_plan": 4.41,
"chosen": true
} /* chosen_range_access_summary */
} /* range_analysis */
},
{
"table": "`t1` `table2`",
"table_scan": {
"rows": 2,
"cost": 2
} /* table_scan */
}
] /* rows_estimation */
},
{
"considered_execution_plans": [
{
"plan_prefix": [
] /* plan_prefix */,
"table": "`t1` `table1`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "col_varchar_key",
"usable": false,
"chosen": false
},
{
"access_type": "range",
"rows": 2,
"cost": 4.81,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 4.81,
"rows_for_plan": 2,
"rest_of_plan": [
{
"plan_prefix": [
"`t1` `table1`"
] /* plan_prefix */,
"table": "`t1` `table2`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "col_varchar_key",
"rows": 1,
"cost": 2.6,
"chosen": true
},
{
"access_type": "scan",
"using_join_cache": true,
"rows": 2,
"cost": 2.8226,
"chosen": false
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 7.61,
"rows_for_plan": 2,
"chosen": true
}
] /* rest_of_plan */
}
] /* considered_execution_plans */
},
{
"attaching_conditions_to_tables": {
"original_condition": "((`table2`.`col_varchar_key` = `table1`.`col_varchar_key`) and <nop>(<in_optimizer>(`table2`.`col_int_nokey`,<exists>(/* select#3 */ select 5 from `t2` where <if>(outer_field_is_not_null, (<cache>(`table2`.`col_int_nokey`) <> 5), true)))) and (`table1`.`pk` in (192,18)))",
"attached_conditions_computation": [
] /* attached_conditions_computation */,
"attached_conditions_summary": [
{
"table": "`t1` `table1`",
"attached": "((`table1`.`pk` in (192,18)) and (`table1`.`col_varchar_key` is not null))"
},
{
"table": "`t1` `table2`",
"attached": "<nop>(<in_optimizer>(`table2`.`col_int_nokey`,<exists>(/* select#3 */ select 5 from `t2` where <if>(outer_field_is_not_null, (<cache>(`table2`.`col_int_nokey`) <> 5), true))))"
}
] /* attached_conditions_summary */
} /* attaching_conditions_to_tables */
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`field1` desc",
"items": [
{
"item": "(/* select#2 */ select sum(`subquery1_t1`.`col_int_nokey`) AS `subquery1_field1` from `t1` `subquery1_t1`)",
"subselect_evaluation": [
{
"subselect_execution": {
"select#": 2,
"steps": [
{
"join_optimization": {
"select#": 2,
"steps": [
{
"table_dependencies": [
{
"table": "`t1` `subquery1_t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
] /* depends_on_map_bits */
}
] /* table_dependencies */
},
{
"rows_estimation": [
{
"table": "`t1` `subquery1_t1`",
"table_scan": {
"rows": 2,
"cost": 2
} /* table_scan */
}
] /* rows_estimation */
},
{
"considered_execution_plans": [
{
"plan_prefix": [
] /* plan_prefix */,
"table": "`t1` `subquery1_t1`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "scan",
"rows": 2,
"cost": 2.4225,
"chosen": true
}
] /* considered_access_paths */
} /* best_access_path */,
"cost_for_plan": 2.4225,
"rows_for_plan": 2,
"chosen": true
}
] /* considered_execution_plans */
},
{
"attaching_conditions_to_tables": {
"original_condition": null,
"attached_conditions_computation": [
] /* attached_conditions_computation */,
"attached_conditions_summary": [
{
"table": "`t1` `subquery1_t1`",
"attached": null
}
] /* attached_conditions_summary */
} /* attaching_conditions_to_tables */
},
{
"refine_plan": [
{
"table": "`t1` `subquery1_t1`",
"access_type": "table_scan"
}
] /* refine_plan */
}
] /* steps */
} /* join_optimization */
},
{
"join_execution": {
"select#": 2,
"steps": [
] /* steps */
} /* join_execution */
}
] /* steps */
} /* subselect_execution */
}
] /* subselect_evaluation */,
"uses_only_constant_tables": true
}
] /* items */,
"resulting_clause_is_simple": true,
"resulting_clause": ""
} /* clause_processing */
},
{
"refine_plan": [
{
"table": "`t1` `table1`",
"pushed_index_condition": "(`table1`.`pk` in (192,18))",
"table_condition_attached": "(`table1`.`col_varchar_key` is not null)",
"access_type": "range"
},
{
"table": "`t1` `table2`"
}
] /* refine_plan */
}
] /* steps */
} /* join_optimization */
},
{
"join_execution": {
"select#": 1,
"steps": [
] /* steps */
} /* join_execution */
}
] /* steps */
} 0 0
drop table t1,t2;
./BlackJoker Mini Shell 1.0