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3bdede3c67
The set of Ordered keys of a rowid merge engine is dense. Thus when we decide not to create a key for a column that has only NULLs, this column shouldn't be counted. Notice that the caller has already precomputed the correct total number of keys that should be created.
51 lines
2.3 KiB
Plaintext
51 lines
2.3 KiB
Plaintext
drop table if exists t1, t2;
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#
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# LP BUG#608744
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#
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set @save_optimizer_switch=@@optimizer_switch;
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set @@optimizer_switch="materialization=on,semijoin=off,partial_match_rowid_merge=on,partial_match_table_scan=off";
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create table t1 (a1 char(1), a2 char(1));
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insert into t1 values (NULL, 'b');
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create table t2 (b1 char(1), b2 char(2));
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insert into t2 values ('a','b'), ('c', 'd');
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select * from t1 where (a1, a2) NOT IN (select b1, b2 from t2);
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a1 a2
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drop table t1,t2;
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set @@optimizer_switch=@save_optimizer_switch;
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#
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# LP BUG#601156
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#
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CREATE TABLE t1 (a1 int DEFAULT NULL, a2 int DEFAULT NULL);
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INSERT INTO t1 VALUES (NULL,2);
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INSERT INTO t1 VALUES (4,NULL);
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CREATE TABLE t2 (b1 int DEFAULT NULL, b2 int DEFAULT NULL);
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INSERT INTO t2 VALUES (6,NULL);
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INSERT INTO t2 VALUES (NULL,0);
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set @save_optimizer_switch=@@optimizer_switch;
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set @@optimizer_switch='materialization=on,semijoin=off,partial_match_rowid_merge=on,partial_match_table_scan=on';
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EXPLAIN EXTENDED
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SELECT * FROM (SELECT * FROM t1 WHERE a1 NOT IN (SELECT b2 FROM t2)) table1;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY <derived2> system NULL NULL NULL NULL 0 0.00 const row not found
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2 DERIVED t1 ALL NULL NULL NULL NULL 2 100.00 Using where
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3 SUBQUERY t2 ALL NULL NULL NULL NULL 2 100.00
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Warnings:
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Note 1003 select NULL AS `a1`,NULL AS `a2` from (select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where (not(<expr_cache><`test`.`t1`.`a1`>(<in_optimizer>(`test`.`t1`.`a1`,`test`.`t1`.`a1` in ()))))) `table1`
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DROP TABLE t1, t2;
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set @@optimizer_switch=@save_optimizer_switch;
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#
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# LP BUG#613009 Crash in Ordered_key::get_field_idx
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#
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set @save_optimizer_switch=@@optimizer_switch;
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set @@optimizer_switch='materialization=on,semijoin=off,partial_match_rowid_merge=on,partial_match_table_scan=off';
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create table t1 (a1 char(3) DEFAULT NULL, a2 char(3) DEFAULT NULL);
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insert into t1 values (NULL, 'a21'), (NULL, 'a22');
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explain select * from t1 where (a1, a2) not in (select a1, a2 from t1);
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
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2 SUBQUERY t1 ALL NULL NULL NULL NULL 2
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select * from t1 where (a1, a2) not in (select a1, a2 from t1);
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a1 a2
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drop table t1;
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set @@optimizer_switch=@save_optimizer_switch;
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