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642aa4366d
tell the optimizer that every TokuDB "clustering" index is the "covering" index in the MariaDB optimizer sense.
144 lines
2.1 KiB
Plaintext
144 lines
2.1 KiB
Plaintext
SET DEFAULT_STORAGE_ENGINE = 'tokudb';
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DROP TABLE IF EXISTS foo;
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create table foo (a int, b bigint, c int, primary key (a))engine=TokuDB;
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insert into foo values (1,10,100),(2,20,200),(3,30,300),(4,40,400),(5,50,500),(6,60,600);
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select * from foo;
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a b c
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1 10 100
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2 20 200
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3 30 300
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4 40 400
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5 50 500
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6 60 600
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select a from foo;
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a
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1
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2
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3
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4
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5
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6
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select * from foo where a > 2;
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a b c
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3 30 300
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4 40 400
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5 50 500
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6 60 600
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select a from foo where a > 2;
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a
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3
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4
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5
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6
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select count(*) from foo;
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count(*)
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6
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alter table foo add index b(b);
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select b from foo;
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b
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10
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20
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30
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40
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50
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60
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explain select * from foo where b > 30;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE foo range b b 9 NULL 3 Using where
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select * from foo where b > 30;
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a b c
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4 40 400
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5 50 500
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6 60 600
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alter table foo drop index b;
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alter table foo add index c(c) clustering=yes;
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select c from foo;
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c
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100
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200
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300
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400
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500
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600
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explain select * from foo where c > 300;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE foo range c c 5 NULL 3 Using where; Using index
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select * from foo where c > 300;
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a b c
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4 40 400
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5 50 500
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6 60 600
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drop table foo;
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create table foo (a int, b int);
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insert into foo values (1,10),(2,20),(3,30),(4,40),(5,50),(6,60);
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select * from foo;
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a b
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1 10
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2 20
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3 30
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4 40
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5 50
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6 60
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select a from foo;
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a
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1
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2
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3
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4
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5
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6
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select b from foo;
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b
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10
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20
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30
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40
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50
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60
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select count(*) from foo;
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count(*)
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6
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drop table foo;
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create table foo (a int, b varchar(10), c blob, d bigint, e varchar(10), f mediumblob)engine=TokuDB;
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insert into foo values(1,"bb","ccccc",100,"eee","fffffffffffffffffffff");
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select * from foo;
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a b c d e f
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1 bb ccccc 100 eee fffffffffffffffffffff
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select a,d from foo;
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a d
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1 100
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select b,e from foo;
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b e
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bb eee
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select c,f from foo;
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c f
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ccccc fffffffffffffffffffff
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select d from foo;
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d
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100
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select e from foo;
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e
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eee
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select f from foo;
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f
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fffffffffffffffffffff
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select a from foo;
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a
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1
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select b from foo;
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b
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bb
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select c from foo;
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c
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ccccc
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select b,c,e,f from foo;
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b c e f
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bb ccccc eee fffffffffffffffffffff
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select a,b,d,e from foo;
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a b d e
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1 bb 100 eee
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select a,d,c,f from foo;
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a d c f
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1 100 ccccc fffffffffffffffffffff
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DROP TABLE foo;
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