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027d90bc58
In select_describe(), make the String object that holds the value of
"partitions" column to "own" the value buffer, so the buffer isn't
prematurely freed.
[this is the second attempt with review fixes]
mysql-test/r/partition_pruning.result:
BUG#19684: Testcase
mysql-test/t/partition_pruning.test:
BUG#19684: Testcase
sql/sql_select.cc:
BUG#19684: Garbage in 'partitions' column in EXPLAIN output:
- Added comment
- Make the String object that holds the value of "partitions" column
to "own" the value buffer, so the buffer isn't prematurely freed.
700 lines
35 KiB
Plaintext
700 lines
35 KiB
Plaintext
drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
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create table t1 ( a int not null) partition by hash(a) partitions 2;
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insert into t1 values (1),(2),(3);
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explain select * from t1 where a=5 and a=6;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
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drop table t1;
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create table t1 (
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a int(11) not null
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) partition by hash (a) partitions 2;
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insert into t1 values (1),(2),(3);
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explain partitions select * from t1 where a=1;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p1 ALL NULL NULL NULL NULL 2 Using where
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explain partitions select * from t1 where a=2;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p0 system NULL NULL NULL NULL 1
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explain partitions select * from t1 where a=1 or a=2;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p0,p1 ALL NULL NULL NULL NULL 3 Using where
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create table t2 (
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a int not null,
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b int not null
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) partition by key(a,b) partitions 2;
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insert into t2 values (1,1),(2,2),(3,3);
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explain partitions select * from t2 where a=1;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 p0,p1 ALL NULL NULL NULL NULL 3 Using where
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explain partitions select * from t2 where b=1;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 p0,p1 ALL NULL NULL NULL NULL 3 Using where
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explain partitions select * from t2 where a=1 and b=1;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 p0 ALL NULL NULL NULL NULL 3 Using where
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create table t3 (
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a int
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)
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partition by range (a*1) (
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partition p0 values less than (10),
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partition p1 values less than (20)
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);
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insert into t3 values (5),(15);
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explain partitions select * from t3 where a=11;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t3 where a=10;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t3 where a=20;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t3 where a=30;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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create table t4 (a int not null, b int not null) partition by LIST (a+b) (
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partition p0 values in (12),
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partition p1 values in (14)
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);
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insert into t4 values (10,2), (10,4);
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explain partitions select * from t4 where (a=10 and b=1) or (a=10 and b=2);
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t4 p0 system NULL NULL NULL NULL 1
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explain partitions select * from t4
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where (a=10 and b=1) or (a=10 and b=2) or (a=10 and b = 3);
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t4 p0 system NULL NULL NULL NULL 1
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explain partitions select * from t4 where (a=10 and b=2) or (a=10 and b=3)
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or (a=10 and b = 4);
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t4 p0,p1 ALL NULL NULL NULL NULL 2 Using where
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explain partitions select * from t4 where (a=10 and b=1) or a=11;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t4 p0,p1 ALL NULL NULL NULL NULL 2 Using where
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explain partitions select * from t4 where (a=10 and b=2) or a=11;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t4 p0,p1 ALL NULL NULL NULL NULL 2 Using where
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drop table t1, t2, t3, t4;
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create table t5 (a int not null, b int not null,
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c int not null, d int not null)
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partition by LIST(a+b) subpartition by HASH (c+d) subpartitions 2
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(
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partition p0 values in (12),
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partition p1 values in (14)
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);
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insert into t5 values (10,2,0,0), (10,4,0,0), (10,2,0,1), (10,4,0,1);
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explain partitions select * from t5;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t5 p0_p0sp0,p0_p0sp1,p1_p1sp0,p1_p1sp1 ALL NULL NULL NULL NULL 4
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explain partitions select * from t5
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where (a=10 and b=1) or (a=10 and b=2) or (a=10 and b = 3);
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t5 p0_p0sp0,p0_p0sp1 ALL NULL NULL NULL NULL 2 Using where
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explain partitions select * from t5 where (a=10 and b=2) or (a=10 and b=3)
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or (a=10 and b = 4);
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t5 p0_p0sp0,p0_p0sp1,p1_p1sp0,p1_p1sp1 ALL NULL NULL NULL NULL 4 Using where
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explain partitions select * from t5 where (c=1 and d=1);
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t5 p0_p0sp0,p1_p1sp0 ALL NULL NULL NULL NULL 2 Using where
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explain partitions select * from t5 where (c=2 and d=1);
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t5 p0_p0sp1,p1_p1sp1 ALL NULL NULL NULL NULL 2 Using where
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explain partitions select * from t5 where (a=10 and b=2 and c=1 and d=1) or
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(c=2 and d=1);
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t5 p0_p0sp0,p0_p0sp1,p1_p1sp1 ALL NULL NULL NULL NULL 3 Using where
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explain partitions select * from t5 where (a=10 and b=2 and c=1 and d=1) or
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(b=2 and c=2 and d=1);
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t5 p0_p0sp0,p0_p0sp1,p1_p1sp1 ALL NULL NULL NULL NULL 3 Using where
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create table t6 (a int not null) partition by LIST(a) (
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partition p1 values in (1),
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partition p3 values in (3),
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partition p5 values in (5),
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partition p7 values in (7),
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partition p9 values in (9)
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);
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insert into t6 values (1),(3),(5);
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explain partitions select * from t6 where a < 1;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t6 where a <= 1;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t6 p1 system NULL NULL NULL NULL 1
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explain partitions select * from t6 where a > 9;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t6 where a >= 9;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t6 where a > 0 and a < 5;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t6 p1,p3 ALL NULL NULL NULL NULL 2 Using where
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explain partitions select * from t6 where a > 5 and a < 12;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t6 where a > 3 and a < 8 ;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t6 p5,p7 system NULL NULL NULL NULL 1
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explain partitions select * from t6 where a >= 0 and a <= 5;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t6 p1,p3,p5 ALL NULL NULL NULL NULL 3 Using where
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explain partitions select * from t6 where a >= 5 and a <= 12;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t6 p5,p7,p9 system NULL NULL NULL NULL 1
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explain partitions select * from t6 where a >= 3 and a <= 8;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t6 p3,p5,p7 ALL NULL NULL NULL NULL 2 Using where
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explain partitions select * from t6 where a > 3 and a < 5;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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create table t7 (a int not null) partition by RANGE(a) (
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partition p10 values less than (10),
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partition p30 values less than (30),
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partition p50 values less than (50),
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partition p70 values less than (70),
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partition p90 values less than (90)
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);
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insert into t7 values (10),(30),(50);
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explain partitions select * from t7 where a < 5;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t7 where a < 10;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t7 where a <= 10;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t7 p10,p30 system NULL NULL NULL NULL 1
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explain partitions select * from t7 where a = 10;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t7 p30 system NULL NULL NULL NULL 1
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explain partitions select * from t7 where a < 90;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t7 p10,p30,p50,p70,p90 ALL NULL NULL NULL NULL 3 Using where
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explain partitions select * from t7 where a = 90;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t7 where a > 90;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t7 where a >= 90;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t7 where a > 11 and a < 29;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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create table t8 (a date not null) partition by RANGE(YEAR(a)) (
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partition p0 values less than (1980),
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partition p1 values less than (1990),
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partition p2 values less than (2000)
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);
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insert into t8 values ('1985-05-05'),('1995-05-05');
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explain partitions select * from t8 where a < '1980-02-02';
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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create table t9 (a date not null) partition by RANGE(TO_DAYS(a)) (
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partition p0 values less than (732299), -- 2004-12-19
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partition p1 values less than (732468), -- 2005-06-06
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partition p2 values less than (732664) -- 2005-12-19
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);
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insert into t9 values ('2005-05-05'), ('2005-04-04');
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explain partitions select * from t9 where a < '2004-12-19';
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t9 where a <= '2004-12-19';
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t9 p0,p1 ALL NULL NULL NULL NULL 2 Using where
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drop table t5,t6,t7,t8,t9;
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create table t1 (a enum('a','b','c','d') default 'a')
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partition by hash (ascii(a)) partitions 2;
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insert into t1 values ('a'),('b'),('c');
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explain partitions select * from t1 where a='b';
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p0,p1 ALL NULL NULL NULL NULL 3 Using where
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drop table t1;
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create table t1 (
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a1 int not null
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)
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partition by range (a1) (
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partition p0 values less than (3),
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partition p1 values less than (6),
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partition p2 values less than (9)
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);
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insert into t1 values (1),(2),(3);
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explain partitions select * from t1 where a1 > 3;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t1 where a1 >= 3;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p1,p2 system NULL NULL NULL NULL 1
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explain partitions select * from t1 where a1 < 3 and a1 > 3;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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drop table t1;
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create table t3 (a int, b int)
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partition by list(a) subpartition by hash(b) subpartitions 4 (
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partition p0 values in (1),
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partition p1 values in (2),
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partition p2 values in (3),
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partition p3 values in (4)
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);
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insert into t3 values (1,1),(2,2),(3,3);
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explain partitions select * from t3 where a=2 or b=1;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t3 p0_p0sp1,p1_p1sp0,p1_p1sp1,p1_p1sp2,p1_p1sp3,p2_p2sp1,p3_p3sp1 ALL NULL NULL NULL NULL 2 Using where
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explain partitions select * from t3 where a=4 or b=2;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t3 p0_p0sp2,p1_p1sp2,p2_p2sp2,p3_p3sp0,p3_p3sp1,p3_p3sp2,p3_p3sp3 system NULL NULL NULL NULL 1
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explain partitions select * from t3 where (a=2 or b=1) and (a=4 or b=2) ;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t3 p1_p1sp2,p3_p3sp1 system NULL NULL NULL NULL 1
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drop table t3;
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create table t1 (a int) partition by hash(a) partitions 2;
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insert into t1 values (1),(2);
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explain partitions select * from t1 where a is null;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t1 where a is not null;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p0,p1 ALL NULL NULL NULL NULL 2 Using where
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drop table t1;
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create table t1 (a int not null, b int not null, key(a), key(b))
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partition by hash(a) partitions 4;
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insert into t1 values (1,1),(2,2),(3,3),(4,4);
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explain partitions
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select * from t1 X, t1 Y
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where X.b = Y.b and (X.a=1 or X.a=2) and (Y.a=2 or Y.a=3);
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE X p1,p2 ALL a,b NULL NULL NULL 2 Using where
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1 SIMPLE Y p2,p3 ref a,b b 4 test.X.b 2 Using where
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explain partitions
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select * from t1 X, t1 Y where X.a = Y.a and (X.a=1 or X.a=2);
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE X p1,p2 ALL a NULL NULL NULL 2 Using where
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1 SIMPLE Y p1,p2 ref a a 4 test.X.a 2
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drop table t1;
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create table t1 (a int) partition by hash(a) partitions 20;
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insert into t1 values (1),(2),(3);
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explain partitions select * from t1 where a > 1 and a < 3;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p2 system NULL NULL NULL NULL 1
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explain partitions select * from t1 where a >= 1 and a < 3;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p1,p2 ALL NULL NULL NULL NULL 2 Using where
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explain partitions select * from t1 where a > 1 and a <= 3;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p2,p3 ALL NULL NULL NULL NULL 2 Using where
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explain partitions select * from t1 where a >= 1 and a <= 3;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p1,p2,p3 ALL NULL NULL NULL NULL 3 Using where
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drop table t1;
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create table t1 (a int, b int)
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partition by list(a) subpartition by hash(b) subpartitions 20
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(
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partition p0 values in (0),
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partition p1 values in (1),
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partition p2 values in (2),
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partition p3 values in (3)
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);
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insert into t1 values (1,1),(2,2),(3,3);
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explain partitions select * from t1 where b > 1 and b < 3;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p0_p0sp2,p1_p1sp2,p2_p2sp2,p3_p3sp2 system NULL NULL NULL NULL 1
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explain partitions select * from t1 where b > 1 and b < 3 and (a =1 or a =2);
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p1_p1sp2,p2_p2sp2 system NULL NULL NULL NULL 1
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drop table t1;
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create table t1 (a int) partition by list(a) (
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partition p0 values in (1,2),
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partition p1 values in (3,4)
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);
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insert into t1 values (1),(1),(2),(2),(3),(4),(3),(4);
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flush status;
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update t1 set a=100 where a=5;
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show status like 'Handler_read_rnd_next';
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Variable_name Value
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Handler_read_rnd_next 0
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flush status;
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update t1 set a=100 where a+1=5+1;
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show status like 'Handler_read_rnd_next';
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Variable_name Value
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Handler_read_rnd_next 10
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flush status;
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delete from t1 where a=5;
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show status like 'Handler_read_rnd_next';
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Variable_name Value
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Handler_read_rnd_next 0
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flush status;
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delete from t1 where a+1=5+1;
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show status like 'Handler_read_rnd_next';
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Variable_name Value
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Handler_read_rnd_next 10
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create table t2 like t1;
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insert into t2 select * from t2;
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flush status;
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update t1,t2 set t1.a=1000, t2.a=1000 where t1.a=5 and t2.a=5;
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show status like 'Handler_read_rnd_next';
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Variable_name Value
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Handler_read_rnd_next 0
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flush status;
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delete t1,t2 from t1, t2 where t1.a=5 and t2.a=5;
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show status like 'Handler_read_rnd_next';
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Variable_name Value
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Handler_read_rnd_next 0
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drop table t1,t2;
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CREATE TABLE `t1` (
|
|
`a` int(11) default NULL
|
|
);
|
|
INSERT INTO t1 VALUES (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
|
|
CREATE TABLE `t2` (
|
|
`a` int(11) default NULL,
|
|
KEY `a` (`a`)
|
|
) ;
|
|
insert into t2 select A.a + 10*(B.a + 10* C.a) from t1 A, t1 B, t1 C ;
|
|
insert into t1 select a from t2;
|
|
drop table t2;
|
|
CREATE TABLE `t2` (
|
|
`a` int(11) default NULL,
|
|
`b` int(11) default NULL
|
|
)
|
|
PARTITION BY RANGE (a) (
|
|
PARTITION p0 VALUES LESS THAN (200),
|
|
PARTITION p1 VALUES LESS THAN (400),
|
|
PARTITION p2 VALUES LESS THAN (600),
|
|
PARTITION p3 VALUES LESS THAN (800),
|
|
PARTITION p4 VALUES LESS THAN (1001));
|
|
insert into t2 select a,1 from t1 where a < 200;
|
|
insert into t2 select a,2 from t1 where a >= 200 and a < 400;
|
|
insert into t2 select a,3 from t1 where a >= 400 and a < 600;
|
|
insert into t2 select a,4 from t1 where a >= 600 and a < 800;
|
|
insert into t2 select a,5 from t1 where a >= 800 and a < 1001;
|
|
explain partitions select * from t2;
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 p0,p1,p2,p3,p4 ALL NULL NULL NULL NULL 1010
|
|
explain partitions select * from t2 where a < 801 and a > 200;
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 p1,p2,p3,p4 ALL NULL NULL NULL NULL 800 Using where
|
|
explain partitions select * from t2 where a < 801 and a > 800;
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 p4 ALL NULL NULL NULL NULL 200 Using where
|
|
explain partitions select * from t2 where a > 600;
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 p3,p4 ALL NULL NULL NULL NULL 400 Using where
|
|
explain partitions select * from t2 where a > 600 and b = 1;
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 p3,p4 ALL NULL NULL NULL NULL 400 Using where
|
|
explain partitions select * from t2 where a > 600 and b = 4;
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 p3,p4 ALL NULL NULL NULL NULL 400 Using where
|
|
explain partitions select * from t2 where a > 600 and b = 5;
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 p3,p4 ALL NULL NULL NULL NULL 400 Using where
|
|
explain partitions select * from t2 where b = 5;
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 p0,p1,p2,p3,p4 ALL NULL NULL NULL NULL 1010 Using where
|
|
flush status;
|
|
update t2 set b = 100 where b = 6;
|
|
show status like 'Handler_read_rnd_next';
|
|
Variable_name Value
|
|
Handler_read_rnd_next 1015
|
|
flush status;
|
|
update t2 set a = 1002 where a = 1001;
|
|
show status like 'Handler_read_rnd_next';
|
|
Variable_name Value
|
|
Handler_read_rnd_next 0
|
|
flush status;
|
|
update t2 set b = 6 where a = 600;
|
|
show status like 'Handler_read_rnd_next';
|
|
Variable_name Value
|
|
Handler_read_rnd_next 201
|
|
flush status;
|
|
update t2 set b = 6 where a > 600 and a < 800;
|
|
show status like 'Handler_read_rnd_next';
|
|
Variable_name Value
|
|
Handler_read_rnd_next 201
|
|
flush status;
|
|
delete from t2 where a > 600;
|
|
show status like 'Handler_read_rnd_next';
|
|
Variable_name Value
|
|
Handler_read_rnd_next 402
|
|
drop table t2;
|
|
CREATE TABLE `t2` (
|
|
`a` int(11) default NULL,
|
|
`b` int(11) default NULL,
|
|
index (b)
|
|
)
|
|
PARTITION BY RANGE (a) (
|
|
PARTITION p0 VALUES LESS THAN (200),
|
|
PARTITION p1 VALUES LESS THAN (400),
|
|
PARTITION p2 VALUES LESS THAN (600),
|
|
PARTITION p3 VALUES LESS THAN (800),
|
|
PARTITION p4 VALUES LESS THAN (1001));
|
|
insert into t2 select a,1 from t1 where a < 100;
|
|
insert into t2 select a,2 from t1 where a >= 200 and a < 300;
|
|
insert into t2 select a,3 from t1 where a >= 300 and a < 400;
|
|
insert into t2 select a,4 from t1 where a >= 400 and a < 500;
|
|
insert into t2 select a,5 from t1 where a >= 500 and a < 600;
|
|
insert into t2 select a,6 from t1 where a >= 600 and a < 700;
|
|
insert into t2 select a,7 from t1 where a >= 700 and a < 800;
|
|
insert into t2 select a,8 from t1 where a >= 800 and a < 900;
|
|
insert into t2 select a,9 from t1 where a >= 900 and a < 1001;
|
|
explain partitions select * from t2;
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 p0,p1,p2,p3,p4 ALL NULL NULL NULL NULL 910
|
|
explain partitions select * from t2 where a = 101;
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 p0 ALL NULL NULL NULL NULL 110 Using where
|
|
explain partitions select * from t2 where a = 550;
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 p2 ALL NULL NULL NULL NULL 200 Using where
|
|
explain partitions select * from t2 where a = 833;
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 p4 ALL NULL NULL NULL NULL 200 Using where
|
|
explain partitions select * from t2 where (a = 100 OR a = 900);
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 p0,p4 ALL NULL NULL NULL NULL 310 Using where
|
|
explain partitions select * from t2 where (a > 100 AND a < 600);
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 p0,p1,p2,p3 ALL NULL NULL NULL NULL 710 Using where
|
|
explain partitions select * from t2 where b = 4;
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 p0,p1,p2,p3,p4 ref b b 5 const 76 Using where
|
|
explain partitions select * from t2 where b = 6;
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 p0,p1,p2,p3,p4 ref b b 5 const 76 Using where
|
|
explain partitions select * from t2 where b in (1,3,5);
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 p0,p1,p2,p3,p4 ALL b NULL NULL NULL 910 Using where
|
|
explain partitions select * from t2 where b in (2,4,6);
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 p0,p1,p2,p3,p4 ALL b NULL NULL NULL 910 Using where
|
|
explain partitions select * from t2 where b in (7,8,9);
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 p0,p1,p2,p3,p4 ALL b NULL NULL NULL 910 Using where
|
|
explain partitions select * from t2 where b > 5;
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 p0,p1,p2,p3,p4 ALL b NULL NULL NULL 910 Using where
|
|
explain partitions select * from t2 where b > 5 and b < 8;
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 p0,p1,p2,p3,p4 ALL b NULL NULL NULL 910 Using where
|
|
explain partitions select * from t2 where b > 5 and b < 7;
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 p0,p1,p2,p3,p4 range b b 5 NULL 76 Using where
|
|
explain partitions select * from t2 where b > 0 and b < 5;
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 p0,p1,p2,p3,p4 ALL b NULL NULL NULL 910 Using where
|
|
flush status;
|
|
update t2 set a = 111 where b = 10;
|
|
show status like 'Handler_read_rnd_next';
|
|
Variable_name Value
|
|
Handler_read_rnd_next 0
|
|
show status like 'Handler_read_key';
|
|
Variable_name Value
|
|
Handler_read_key 5
|
|
flush status;
|
|
update t2 set a = 111 where b in (5,6);
|
|
show status like 'Handler_read_rnd_next';
|
|
Variable_name Value
|
|
Handler_read_rnd_next 915
|
|
show status like 'Handler_read_key';
|
|
Variable_name Value
|
|
Handler_read_key 0
|
|
flush status;
|
|
update t2 set a = 222 where b = 7;
|
|
show status like 'Handler_read_rnd_next';
|
|
Variable_name Value
|
|
Handler_read_rnd_next 0
|
|
show status like 'Handler_read_key';
|
|
Variable_name Value
|
|
Handler_read_key 5
|
|
flush status;
|
|
delete from t2 where b = 7;
|
|
show status like 'Handler_read_rnd_next';
|
|
Variable_name Value
|
|
Handler_read_rnd_next 0
|
|
show status like 'Handler_read_key';
|
|
Variable_name Value
|
|
Handler_read_key 5
|
|
flush status;
|
|
delete from t2 where b > 5;
|
|
show status like 'Handler_read_rnd_next';
|
|
Variable_name Value
|
|
Handler_read_rnd_next 1215
|
|
show status like 'Handler_read_key';
|
|
Variable_name Value
|
|
Handler_read_key 0
|
|
show status like 'Handler_read_prev';
|
|
Variable_name Value
|
|
Handler_read_prev 0
|
|
show status like 'Handler_read_next';
|
|
Variable_name Value
|
|
Handler_read_next 0
|
|
flush status;
|
|
delete from t2 where b < 5 or b > 3;
|
|
show status like 'Handler_read_rnd_next';
|
|
Variable_name Value
|
|
Handler_read_rnd_next 1215
|
|
show status like 'Handler_read_key';
|
|
Variable_name Value
|
|
Handler_read_key 0
|
|
show status like 'Handler_read_prev';
|
|
Variable_name Value
|
|
Handler_read_prev 0
|
|
show status like 'Handler_read_next';
|
|
Variable_name Value
|
|
Handler_read_next 0
|
|
drop table t1, t2;
|
|
create table t1 ( f_int1 mediumint, f_int2 integer)
|
|
partition by list(mod(f_int1,4)) (
|
|
partition p_3 values in (-3),
|
|
partition p_2 values in (-2),
|
|
partition p_1 values in (-1),
|
|
partition p0 values in (0),
|
|
partition p1 values in (1),
|
|
partition p2 values in (2),
|
|
partition p3 values in (3)
|
|
);
|
|
insert into t1 values (9, 9), (8, 8), (7, 7), (6, 6), (5, 5),
|
|
(4, 4), (3, 3), (2, 2), (1, 1);
|
|
select * from t1 where f_int1 between 5 and 15 order by f_int1;
|
|
f_int1 f_int2
|
|
5 5
|
|
6 6
|
|
7 7
|
|
8 8
|
|
9 9
|
|
drop table t1;
|
|
create table t1 (a char(10)) partition by list(length(a)) (
|
|
partition p1 values in (1),
|
|
partition p2 values in (2),
|
|
partition p3 values in (3),
|
|
partition p4 values in (4),
|
|
partition p5 values in (5)
|
|
);
|
|
insert into t1 values ('a'),('bb'),('ccc'),('dddd'),('eeEee');
|
|
select * from t1 where a>='a' and a <= 'dddd';
|
|
a
|
|
a
|
|
bb
|
|
ccc
|
|
dddd
|
|
explain partitions select * from t1 where a>='a' and a <= 'dddd';
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 p1,p2,p3,p4,p5 ALL NULL NULL NULL NULL 5 Using where
|
|
drop table t1;
|
|
create table t1 (f_int1 integer) partition by list(abs(mod(f_int1,2)))
|
|
subpartition by hash(f_int1) subpartitions 2
|
|
(
|
|
partition part1 values in (0),
|
|
partition part2 values in (1),
|
|
partition part4 values in (null)
|
|
);
|
|
insert into t1 set f_int1 = null;
|
|
select * from t1 where f_int1 is null;
|
|
f_int1
|
|
NULL
|
|
explain partitions select * from t1 where f_int1 is null;
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 part4_part4sp0 system NULL NULL NULL NULL 1
|
|
drop table t1;
|
|
create table t1 (a int not null, b int not null)
|
|
partition by list(a)
|
|
subpartition by hash(b) subpartitions 4
|
|
(
|
|
partition p0 values in (1),
|
|
partition p1 values in (2),
|
|
partition p2 values in (3)
|
|
);
|
|
insert into t1 values (1,1),(1,2),(1,3),(1,4),
|
|
(2,1),(2,2),(2,3),(2,4);
|
|
explain partitions select * from t1 where a=1 AND (b=1 OR b=2);
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 p0_p0sp1,p0_p0sp2 ALL NULL NULL NULL NULL 2 Using where
|
|
drop table t1;
|
|
create table t1 (a int, b int not null)
|
|
partition by list(a)
|
|
subpartition by hash(b) subpartitions 2
|
|
(
|
|
partition p0 values in (1),
|
|
partition p1 values in (2),
|
|
partition p2 values in (3),
|
|
partition pn values in (NULL)
|
|
);
|
|
insert into t1 values (1,1),(1,2),(1,3),(1,4),
|
|
(2,1),(2,2),(2,3),(2,4), (NULL,1);
|
|
explain partitions select * from t1 where a IS NULL AND (b=1 OR b=2);
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 pn_pnsp0,pn_pnsp1 system NULL NULL NULL NULL 1
|
|
explain partitions select * from t1 where (a IS NULL or a < 1) AND (b=1 OR b=2);
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 pn_pnsp0,pn_pnsp1 system NULL NULL NULL NULL 1
|
|
explain partitions select * from t1 where (a IS NULL or a < 2) AND (b=1 OR b=2);
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 p0_p0sp0,p0_p0sp1,pn_pnsp0,pn_pnsp1 ALL NULL NULL NULL NULL 5 Using where
|
|
explain partitions select * from t1 where (a IS NULL or a <= 1) AND (b=1 OR b=2);
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 p0_p0sp0,p0_p0sp1,pn_pnsp0,pn_pnsp1 ALL NULL NULL NULL NULL 5 Using where
|
|
drop table t1;
|
|
create table t1 ( a int) partition by list (MOD(a, 10))
|
|
( partition p0 values in (0), partition p1 values in (1),
|
|
partition p2 values in (2), partition p3 values in (3),
|
|
partition p4 values in (4), partition p5 values in (5),
|
|
partition p6 values in (6), partition pn values in (NULL)
|
|
);
|
|
insert into t1 values (NULL), (0),(1),(2),(3),(4),(5),(6);
|
|
explain partitions select * from t1 where a is null or a < 2;
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 p0,p1,p2,p3,p4,p5,p6,pn ALL NULL NULL NULL NULL 8 Using where
|
|
drop table t1;
|
|
create table t1 (s1 int) partition by list (s1)
|
|
(partition p1 values in (0),
|
|
partition p2 values in (1),
|
|
partition p3 values in (null));
|
|
insert into t1 values (0),(1),(null);
|
|
select count(*) from t1 where s1 < 0 or s1 is null;
|
|
count(*)
|
|
1
|
|
explain partitions select count(*) from t1 where s1 < 0 or s1 is null;
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 p3 system NULL NULL NULL NULL 1
|
|
drop table t1;
|
|
create table t1 (a char(32) primary key)
|
|
partition by key()
|
|
partitions 100;
|
|
insert into t1 values ('na');
|
|
select * from t1;
|
|
a
|
|
na
|
|
select * from t1 where a like 'n%';
|
|
a
|
|
na
|
|
drop table t1;
|
|
create table t1 (s1 varchar(15)) partition by key (s1);
|
|
select * from t1 where s1 = 0 or s1 is null;
|
|
s1
|
|
insert into t1 values ('aa'),('bb'),('0');
|
|
explain partitions select * from t1 where s1 = 0 or s1 is null;
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 p0 ALL NULL NULL NULL NULL 3 Using where
|
|
drop table t1;
|
|
create table t2 (a int, b int)
|
|
partition by LIST(a)
|
|
subpartition by HASH(b) subpartitions 40
|
|
( partition p_0_long_partition_name values in(1),
|
|
partition p_1_long_partition_name values in(2));
|
|
insert into t2 values (1,1),(2,2);
|
|
explain partitions select * from t2;
|
|
id 1
|
|
select_type SIMPLE
|
|
table t2
|
|
partitions p_0_long_partition_name_p_0_long_partition_namesp0,p_0_long_partition_name_p_0_long_partition_namesp1,p_0_long_partition_name_p_0_long_partition_namesp2,p_0_long_partition_name_p_0_long_partition_namesp3,p_0_long_partition_name_p_0_long_partition_namesp4,p_0_long_partition_name_p_0_long_partition_namesp5,p_0_long_partition_name_p_0_long_partition_namesp6,p_0_long_partition_name_p_0_long_partition_namesp7,p_0_long_partition_name_p_0_long_partition_namesp8,p_0_long_partition_name_p_0_long_partition_namesp9,p_0_long_partition_name_p_0_long_partition_namesp10,p_0_long_partition_name_p_0_long_partition_namesp11,p_0_long_partition_name_p_0_long_partition_namesp12,p_0_long_partition_name_p_0_long_partition_namesp13,p_0_long_partition_name_p_0_long_partition_namesp14,p_0_long_partition_name_p_0_long_partition_namesp15,p_0_long_partition_name_p_0_long_partition_namesp16,p_0_long_partition_name_p_0_long_partition_namesp17,p_0_long_partition_name_p_0_long_partition_namesp18,p_0_long_partition_name_p_0_long_partition_namesp19,p_0_long_partition_name_p_0_long_partition_namesp20,p_0_long_partition_name_p_0_long_partition_namesp21,p_0_long_partition_name_p_0_long_partition_namesp22,p_0_long_partition_name_p_0_long_partition_namesp23,p_0_long_partition_name_p_0_long_partition_namesp24,p_0_long_partition_name_p_0_long_partition_namesp25,p_0_long_partition_name_p_0_long_partition_namesp26,p_0_long_partition_name_p_0_long_partition_namesp27,p_0_long_partition_name_p_0_long_partition_namesp28,p_0_long_partition_name_p_0_long_partition_namesp29,p_0_long_partition_name_p_0_long_partition_namesp30,p_0_long_partition_name_p_0_long_partition_namesp31,p_0_long_partition_name_p_0_long_partition_namesp32,p_0_long_partition_name_p_0_long_partition_namesp33,p_0_long_partition_name_p_0_long_partition_namesp34,p_0_long_partition_name_p_0_long_partition_namesp35,p_0_long_partition_name_p_0_long_partition_namesp36,p_0_long_partition_name_p_0_long_partition_namesp37,p_0_long_partition_name_p_0_long_partition_namesp38,p_0_long_partition_name_p_0_long_partition_namesp39,p_1_long_partition_name_p_1_long_partition_namesp0,p_1_long_partition_name_p_1_long_partition_namesp1,p_1_long_partition_name_p_1_long_partition_namesp2,p_1_long_partition_name_p_1_long_partition_namesp3,p_1_long_partition_name_p_1_long_partition_namesp4,p_1_long_partition_name_p_1_long_partition_namesp5,p_1_long_partition_name_p_1_long_partition_namesp6,p_1_long_partition_name_p_1_long_partition_namesp7,p_1_long_partition_name_p_1_long_partition_namesp8,p_1_long_partition_name_p_1_long_partition_namesp9,p_1_long_partition_name_p_1_long_partition_namesp10,p_1_long_partition_name_p_1_long_partition_namesp11,p_1_long_partition_name_p_1_long_partition_namesp12,p_1_long_partition_name_p_1_long_partition_namesp13,p_1_long_partition_name_p_1_long_partition_namesp14,p_1_long_partition_name_p_1_long_partition_namesp15,p_1_long_partition_name_p_1_long_partition_namesp16,p_1_long_partition_name_p_1_long_partition_namesp17,p_1_long_partition_name_p_1_long_partition_namesp18,p_1_long_partition_name_p_1_long_partition_namesp19,p_1_long_partition_name_p_1_long_partition_namesp20,p_1_long_partition_name_p_1_long_partition_namesp21,p_1_long_partition_name_p_1_long_partition_namesp22,p_1_long_partition_name_p_1_long_partition_namesp23,p_1_long_partition_name_p_1_long_partition_namesp24,p_1_long_partition_name_p_1_long_partition_namesp25,p_1_long_partition_name_p_1_long_partition_namesp26,p_1_long_partition_name_p_1_long_partition_namesp27,p_1_long_partition_name_p_1_long_partition_namesp28,p_1_long_partition_name_p_1_long_partition_namesp29,p_1_long_partition_name_p_1_long_partition_namesp30,p_1_long_partition_name_p_1_long_partition_namesp31,p_1_long_partition_name_p_1_long_partition_namesp32,p_1_long_partition_name_p_1_long_partition_namesp33,p_1_long_partition_name_p_1_long_partition_namesp34,p_1_long_partition_name_p_1_long_partition_namesp35,p_1_long_partition_name_p_1_long_partition_namesp36,p_1_long_partition_name_p_1_long_partition_namesp37,p_1_long_partition_name_p_1_long_partition_namesp38,p_1_long_partition_name_p_1_long_partition_namesp39
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type ALL
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possible_keys NULL
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key NULL
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key_len NULL
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ref NULL
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rows 2
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Extra
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drop table t2;
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