@@ -1085,7 +1085,7 @@ EXPLAIN SELECT Name, Country, Population FROM City WHERE
(Name='Samara' AND Country='RUS') OR
(Name='Seattle' AND Country='USA');
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE City index_merge Country,CountryPopulation,CountryName,CityName CountryName,CityName 38,35 NULL 27 Using sort_union(CountryName,CityName); Using where
1 SIMPLE City range Country,CountryPopulation,CountryName,CityName CityName 35 NULL 27 Using index condition; Using where
SELECT Name, Country, Population FROM City WHERE
(Name='Manila' AND Country='PHL') OR
(Name='Addis Abeba' AND Country='ETH') OR
...
...
@@ -1116,32 +1116,32 @@ SELECT Name, Country, Population FROM City WHERE
(Name='Seattle' AND Country='USA');
Name Country Population
Addis Abeba ETH 2495000
Manila PHL 1581082
Jakarta IDN 9604900
Delhi IND 7206704
Ankara TUR 3038159
Bangalore IND 2660088
Teheran IRN 6758845
Roma ITA 2643581
Venezia ITA 277305
Tokyo JPN 7980230
Toronto CAN 688275
Vancouver CAN 514008
Peking CHN 7472000
Seoul KOR 9981619
Basel CHE 166700
Caracas VEN 1975294
Dakar SEN 785071
Delhi IND 7206704
Dresden DEU 476668
Jakarta IDN 9604900
Kaunas LTU 412639
Rabat MAR 623457
Tijuana MEX 1212232
Lagos NGA 1518000
Lugansk UKR 469000
Manila PHL 1581082
Paris FRA 2125246
Dresden DEU 476668
Dakar SEN 785071
Basel CHE 166700
Peking CHN 7472000
Praha CZE 1181126
Ankara TUR 3038159
Lugansk UKR 469000
Caracas VEN 1975294
Rabat MAR 623457
Roma ITA 2643581
Samara RUS 1156100
Seattle USA 563374
Seoul KOR 9981619
Teheran IRN 6758845
Tijuana MEX 1212232
Tokyo JPN 7980230
Toronto CAN 688275
Vancouver CAN 514008
Venezia ITA 277305
set optimizer_switch='index_merge=off';
EXPLAIN SELECT Name, Country, Population FROM City WHERE
(Name='Manila' AND Country='PHL') OR
...
...
@@ -1172,7 +1172,7 @@ EXPLAIN SELECT Name, Country, Population FROM City WHERE
(Name='Samara' AND Country='RUS') OR
(Name='Seattle' AND Country='USA');
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE City range Country,CountryPopulation,CountryName,CityName CityName 35 NULL 28 Using index condition; Using where
1 SIMPLE City range Country,CountryPopulation,CountryName,CityName CityName 35 NULL 27 Using index condition; Using where
SELECT Name, Country, Population FROM City WHERE
(Name='Manila' AND Country='PHL') OR
(Name='Addis Abeba' AND Country='ETH') OR
...
...
@@ -1757,6 +1757,7 @@ INSERT INTO t1 VALUES
(0,72,321,-7),(0,73,0,3),(0,74,5,25),(0,75,5,3);
ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze status Engine-independent statistics collected
test.t1 analyze status OK
SET SESSION optimizer_switch='index_merge_sort_union=off';
EXPLAIN
...
...
@@ -1837,6 +1838,7 @@ INSERT INTO t1 VALUES
;
ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze status Engine-independent statistics collected
test.t1 analyze status OK
EXPLAIN
SELECT * FROM t1 FORCE KEY (state,capital)
...
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@@ -1904,23 +1906,23 @@ Country='NOR' AND Name IN ('Oslo', 'Bergen') OR
Country='ITA' AND Name IN ('Napoli', 'Venezia');
ID Name Country Population
175 Antwerpen BEL 446525
176 Gent BEL 224180
2808 Bergen NOR 230948
3068 Berlin DEU 3386667
3087 Bonn DEU 301048
2918 Braga PRT 90535
176 Gent BEL 224180
3242 Lahti FIN 96921
2974 Paris FRA 2125246
3580 Moscow RUS 8389200
1466 Napoli ITA 1002619
1474 Venezia ITA 277305
2808 Bergen NOR 230948
2807 Oslo NOR 508726
2928 Warszawa POL 1615369
2931 Wroclaw POL 636765
2918 Braga PRT 90535
2974 Paris FRA 2125246
2915 Porto PRT 273060
3580 Moscow RUS 8389200
3581 St Petersburg RUS 4694000
3048 Stockholm SWE 750348
3051 Uppsala SWE 189569
1474 Venezia ITA 277305
2928 Warszawa POL 1615369
2931 Wroclaw POL 636765
explain select * from City
where
Country='FIN' AND Name IN ('Lahti','Imatra') OR
...
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@@ -1934,7 +1936,7 @@ Country='POL' AND Name IN ('Warszawa', 'Wroclaw') OR
Country='NOR' AND Name IN ('Oslo', 'Bergen') OR
Country='ITA' AND Name IN ('Napoli', 'Venezia');
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE City range CountryName,Name CountryName 38 NULL 20 Using index condition; Using where
1 SIMPLE City range CountryName,Name Name 35 NULL 20 Using index condition; Using where
DROP DATABASE world;
set session optimizer_switch='index_merge_sort_intersection=default';
set global innodb_stats_persistent= @innodb_stats_persistent_save;
Note 1003 /* select#1 */ select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` where <expr_cache><`test`.`t1i`.`a1`,`test`.`t1i`.`a2`>(<in_optimizer>((`test`.`t1i`.`a1`,`test`.`t1i`.`a2`),(`test`.`t1i`.`a1`,`test`.`t1i`.`a2`) in ( <materialize> (/* select#2 */ select `test`.`t2i`.`b1`,max(`test`.`t2i`.`b2`) from `test`.`t2i` where `test`.`t2i`.`b1` > '0' group by `test`.`t2i`.`b1` ), <primary_index_lookup>(`test`.`t1i`.`a1` in <temporary table> on distinct_key where `test`.`t1i`.`a1` = `<subquery2>`.`b1` and `test`.`t1i`.`a2` = `<subquery2>`.`max(b2)`))))
select * from t1i where (a1, a2) in (select b1, max(b2) from t2i where b1 > '0' group by b1);
...
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@@ -144,7 +150,7 @@ explain extended
select * from t1i where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);
id select_type table type possible_keys key key_len ref rows filtered Extra
Note 1003 /* select#1 */ select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` where <expr_cache><`test`.`t1i`.`a1`,`test`.`t1i`.`a2`>(<in_optimizer>((`test`.`t1i`.`a1`,`test`.`t1i`.`a2`),(`test`.`t1i`.`a1`,`test`.`t1i`.`a2`) in ( <materialize> (/* select#2 */ select `test`.`t2i`.`b1`,min(`test`.`t2i`.`b2`) from `test`.`t2i` where `test`.`t2i`.`b1` > '0' group by `test`.`t2i`.`b1` ), <primary_index_lookup>(`test`.`t1i`.`a1` in <temporary table> on distinct_key where `test`.`t1i`.`a1` = `<subquery2>`.`b1` and `test`.`t1i`.`a2` = `<subquery2>`.`min(b2)`))))
select * from t1i where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);
...
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@@ -158,6 +164,7 @@ insert into t2i_c select * from t2i;
insert into t2i_c select * from t2i;
analyze table t2i_c;
Table Op Msg_type Msg_text
test.t2i_c analyze status Engine-independent statistics collected
test.t2i_c analyze status OK
show create table t2i_c;
Table Create Table
...
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@@ -172,7 +179,7 @@ explain extended
select * from t1 where (a1, a2) in (select b1, max(b2) from t2i_c group by b1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
2 MATERIALIZED t2i_c range NULL it2i3 9 NULL 3 100.00 Using index for group-by
2 MATERIALIZED t2i_c range NULL it2i3 9 NULL 4 100.00 Using index for group-by
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where <expr_cache><`test`.`t1`.`a1`,`test`.`t1`.`a2`>(<in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( <materialize> (/* select#2 */ select `test`.`t2i_c`.`b1`,max(`test`.`t2i_c`.`b2`) from `test`.`t2i_c` group by `test`.`t2i_c`.`b1` ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where `test`.`t1`.`a1` = `<subquery2>`.`b1` and `test`.`t1`.`a2` = `<subquery2>`.`max(b2)`))))
select * from t1 where (a1, a2) in (select b1, max(b2) from t2i_c group by b1);
...
...
@@ -183,11 +190,11 @@ prepare st1 from "explain select * from t1 where (a1, a2) in (select b1, max(b2)
execute st1;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 Using where
2 MATERIALIZED t2i_c range NULL it2i3 9 NULL 3 Using index for group-by
2 MATERIALIZED t2i_c range NULL it2i3 9 NULL 4 Using index for group-by
execute st1;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 Using where
2 MATERIALIZED t2i_c range NULL it2i3 9 NULL 3 Using index for group-by
2 MATERIALIZED t2i_c range NULL it2i3 9 NULL 4 Using index for group-by
prepare st2 from "select * from t1 where (a1, a2) in (select b1, max(b2) from t2i_c group by b1)";
execute st2;
a1 a2
...
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@@ -202,7 +209,7 @@ explain extended
select * from t1 where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
2 MATERIALIZED t2i range it2i1,it2i3 it2i3 18 NULL 3 100.00 Using where; Using index for group-by
2 MATERIALIZED t2i range it2i1,it2i3 it2i3 9 NULL 5 100.00 Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where <expr_cache><`test`.`t1`.`a1`,`test`.`t1`.`a2`>(<in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( <materialize> (/* select#2 */ select `test`.`t2i`.`b1`,min(`test`.`t2i`.`b2`) from `test`.`t2i` where `test`.`t2i`.`b1` > '0' group by `test`.`t2i`.`b1` ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where `test`.`t1`.`a1` = `<subquery2>`.`b1` and `test`.`t1`.`a2` = `<subquery2>`.`min(b2)`))))
select * from t1 where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);
...
...
@@ -511,7 +518,7 @@ where (c1, c2) in (select b1, b2 from t2i where b2 > '0' or b2 = a2));
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
5 DEPENDENT SUBQUERY t3c ALL NULL NULL NULL NULL 4 100.00 Using where
6 DEPENDENT SUBQUERY t2i index_subquery it2i1,it2i2,it2i3 it2i3 18 func,func 2 100.00 Using index; Using where
6 DEPENDENT SUBQUERY t2i index_subquery it2i1,it2i2,it2i3 it2i3 18 func,func 1 100.00 Using index; Using where
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 5 100.00 Using where
4 MATERIALIZED t3b ALL NULL NULL NULL NULL 4 100.00 Using where
3 DEPENDENT SUBQUERY t3a ALL NULL NULL NULL NULL 4 100.00 Using where
Note 1003 /* select#1 */ select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from <materialize> (/* select#2 */ select `test`.`t2i`.`b1`,max(`test`.`t2i`.`b2`) from `test`.`t2i` where `test`.`t2i`.`b1` > '0' group by `test`.`t2i`.`b1`) join `test`.`t1i` where `<subquery2>`.`b1` = `test`.`t1i`.`a1` and `<subquery2>`.`max(b2)` = `test`.`t1i`.`a2`
select * from t1i where (a1, a2) in (select b1, max(b2) from t2i where b1 > '0' group by b1);
...
...
@@ -150,7 +156,7 @@ select * from t1i where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0'
id select_type table type possible_keys key key_len ref rows filtered Extra
Note 1003 /* select#1 */ select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from <materialize> (/* select#2 */ select `test`.`t2i`.`b1`,min(`test`.`t2i`.`b2`) from `test`.`t2i` where `test`.`t2i`.`b1` > '0' group by `test`.`t2i`.`b1`) join `test`.`t1i` where `<subquery2>`.`b1` = `test`.`t1i`.`a1` and `<subquery2>`.`min(b2)` = `test`.`t1i`.`a2`
select * from t1i where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);
...
...
@@ -164,6 +170,7 @@ insert into t2i_c select * from t2i;
insert into t2i_c select * from t2i;
analyze table t2i_c;
Table Op Msg_type Msg_text
test.t2i_c analyze status Engine-independent statistics collected
test.t2i_c analyze status OK
show create table t2i_c;
Table Create Table
...
...
@@ -179,7 +186,7 @@ select * from t1 where (a1, a2) in (select b1, max(b2) from t2i_c group by b1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
2 MATERIALIZED t2i_c range NULL it2i3 9 NULL 3 100.00 Using index for group-by
2 MATERIALIZED t2i_c range NULL it2i3 9 NULL 4 100.00 Using index for group-by
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from <materialize> (/* select#2 */ select `test`.`t2i_c`.`b1`,max(`test`.`t2i_c`.`b2`) from `test`.`t2i_c` group by `test`.`t2i_c`.`b1`) join `test`.`t1` where `<subquery2>`.`b1` = `test`.`t1`.`a1` and `<subquery2>`.`max(b2)` = `test`.`t1`.`a2`
select * from t1 where (a1, a2) in (select b1, max(b2) from t2i_c group by b1);
...
...
@@ -191,12 +198,12 @@ execute st1;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 Using where
2 MATERIALIZED t2i range it2i1,it2i3 it2i3 18 NULL 3 100.00 Using where; Using index for group-by
2 MATERIALIZED t2i range it2i1,it2i3 it2i3 9 NULL 5 100.00 Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from <materialize> (/* select#2 */ select `test`.`t2i`.`b1`,min(`test`.`t2i`.`b2`) from `test`.`t2i` where `test`.`t2i`.`b1` > '0' group by `test`.`t2i`.`b1`) join `test`.`t1` where `<subquery2>`.`b1` = `test`.`t1`.`a1` and `<subquery2>`.`min(b2)` = `test`.`t1`.`a2`
select * from t1 where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);
...
...
@@ -328,7 +335,7 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
3 MATERIALIZED t3 ALL NULL NULL NULL NULL 4 100.00 Using where
3 MATERIALIZED t2i ref it2i1,it2i2,it2i3 it2i3 18 test.t3.c1,test.t3.c2 2 100.00 Using index
3 MATERIALIZED t2i ref it2i1,it2i2,it2i3 it2i3 18 test.t3.c1,test.t3.c2 1 100.00 Using index
2 MATERIALIZED t2 ALL NULL NULL NULL NULL 5 100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` semi join (`test`.`t2`) semi join (`test`.`t2i` join `test`.`t3`) where `test`.`t2i`.`b1` = `test`.`t3`.`c1` and `test`.`t2i`.`b2` = `test`.`t3`.`c2` and `test`.`t2`.`b1` > '0' and `test`.`t3`.`c2` > '0'
...
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@@ -348,7 +355,7 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
Note 1003 select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` semi join (`test`.`t2i`) semi join (`test`.`t2i` join `test`.`t3i`) where `test`.`t1i`.`a1` = `test`.`t2i`.`b1` and `test`.`t3i`.`c1` = `test`.`t2i`.`b1` and `test`.`t2i`.`b1` = `test`.`t2i`.`b1` and `test`.`t1i`.`a2` = `test`.`t2i`.`b2` and `test`.`t3i`.`c2` = `test`.`t2i`.`b2` and `test`.`t2i`.`b2` = `test`.`t2i`.`b2` and `test`.`t2i`.`b1` > '0' and `test`.`t2i`.`b2` > '0'
select * from t1i
...
...
@@ -370,7 +377,7 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
NULL UNION RESULT <union1,7> ALL NULL # # # NULL NULL #
Warnings:
Note 1003 (/* select#1 */ select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` semi join (`test`.`t2`) semi join (`test`.`t2i` join `test`.`t3`) where `test`.`t2i`.`b1` = `test`.`t3`.`c1` and `test`.`t2i`.`b2` = `test`.`t3`.`c2` and (<expr_cache><`test`.`t2`.`b2`>(<in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (/* select#3 */ select `test`.`t3`.`c2` from `test`.`t3` where `test`.`t3`.`c2` like '%02' ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where `test`.`t2`.`b2` = `<subquery3>`.`c2`)))) or <expr_cache><`test`.`t2`.`b2`>(<in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (/* select#4 */ select `test`.`t3`.`c2` from `test`.`t3` where `test`.`t3`.`c2` like '%03' ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where `test`.`t2`.`b2` = `<subquery4>`.`c2`))))) and `test`.`t3`.`c2` > '0') union (/* select#7 */ select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` semi join (`test`.`t2i`) semi join (`test`.`t2i` join `test`.`t3i`) where `test`.`t1i`.`a1` = `test`.`t2i`.`b1` and `test`.`t3i`.`c1` = `test`.`t2i`.`b1` and `test`.`t2i`.`b1` = `test`.`t2i`.`b1` and `test`.`t1i`.`a2` = `test`.`t2i`.`b2` and `test`.`t3i`.`c2` = `test`.`t2i`.`b2` and `test`.`t2i`.`b2` = `test`.`t2i`.`b2` and `test`.`t2i`.`b1` > '0' and `test`.`t2i`.`b2` > '0')
...
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@@ -464,7 +471,7 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where