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partition_column_prune.result
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drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9; create table t1 (a char, b char, c char) partition by range columns(a,b,c) ( partition p0 values less than ('a','b','c')); insert into t1 values ('a', NULL, 'd'); explain partitions select * from t1 where a = 'a' AND c = 'd'; id select_type table partitions type possible_keys key key_len ref rows Extra 1 SIMPLE t1 p0 system NULL NULL NULL NULL 1 NULL select * from t1 where a = 'a' AND c = 'd'; a b c a NULL d drop table t1; create table t1 (a int not null) partition by range columns(a) ( partition p0 values less than (10), partition p1 values less than (20), partition p2 values less than (30), partition p3 values less than (40), partition p4 values less than (50), partition p5 values less than (60), partition p6 values less than (70) ); insert into t1 values (5),(15),(25),(35),(45),(55),(65); insert into t1 values (5),(15),(25),(35),(45),(55),(65); create table t2 (a int not null) partition by range(a) ( partition p0 values less than (10), partition p1 values less than (20), partition p2 values less than (30), partition p3 values less than (40), partition p4 values less than (50), partition p5 values less than (60), partition p6 values less than (70) ); insert into t2 values (5),(15),(25),(35),(45),(55),(65); insert into t2 values (5),(15),(25),(35),(45),(55),(65); explain partitions select * from t1 where a > 35 and a < 45; id select_type table partitions type possible_keys key key_len ref rows Extra 1 SIMPLE t1 p3,p4 ALL NULL NULL NULL NULL 4 Using where explain partitions select * from t2 where a > 35 and a < 45; id select_type table partitions type possible_keys key key_len ref rows Extra 1 SIMPLE t2 p3,p4 ALL NULL NULL NULL NULL 4 Using where drop table t1, t2; create table t1 (a int not null, b int not null ) partition by range columns(a,b) ( partition p01 values less than (2,10), partition p02 values less than (2,20), partition p03 values less than (2,30), partition p11 values less than (4,10), partition p12 values less than (4,20), partition p13 values less than (4,30), partition p21 values less than (6,10), partition p22 values less than (6,20), partition p23 values less than (6,30) ); insert into t1 values (2,5), (2,15), (2,25), (4,5), (4,15), (4,25), (6,5), (6,15), (6,25); insert into t1 select * from t1; explain partitions select * from t1 where a=2; id select_type table partitions type possible_keys key key_len ref rows Extra 1 SIMPLE t1 p01,p02,p03,p11 ALL NULL NULL NULL NULL 8 Using where explain partitions select * from t1 where a=4; id select_type table partitions type possible_keys key key_len ref rows Extra 1 SIMPLE t1 p11,p12,p13,p21 ALL NULL NULL NULL NULL 8 Using where explain partitions select * from t1 where a=2 and b < 22; id select_type table partitions type possible_keys key key_len ref rows Extra 1 SIMPLE t1 p01,p02,p03 ALL NULL NULL NULL NULL 6 Using where drop table t1;