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Analysis: The cause of the bug was that the method subselect_rowid_merge_engine::partial_match() was not designed for re-execution within the same query. Specifically, it didn't cleanup the bitmap of matching keys after completion. The test query requires double execution of the IN predicate because it first checks the predicate as a constant condition. The second execution during regular execution used the bitmap of matching keys produced by the first execution instead of starting with a clean one. Solution: Cleanup the bitmap of matching keys at the end of the partial matching procedure.
378 lines
10 KiB
Plaintext
378 lines
10 KiB
Plaintext
#
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# Tests for
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# MWL#68: Subquery optimization: Efficient NOT IN execution with NULLs
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#
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set @save_optimizer_switch=@@optimizer_switch;
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--echo -------------------------------
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--echo Part 1: Feature tests.
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--echo -------------------------------
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--echo Default for all tests.
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set @@optimizer_switch="materialization=on,in_to_exists=off,semijoin=off,subquery_cache=off";
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--echo
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--echo Schema requires partial matching, but data analysis discoveres there is
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--echo no need. This is possible only if all outer columns are not NULL.
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--echo
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create table t1 (a1 char(8) not null, a2 char(8) not null);
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create table t2 (b1 char(8), b2 char(8));
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insert into t1 values ('1 - 00', '2 - 00');
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insert into t1 values ('1 - 01', '2 - 01');
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insert into t2 values ('1 - 00', '2 - 00');
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insert into t2 values ('1 - 01', NULL );
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insert into t2 values (NULL , '2 - 02');
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insert into t2 values (NULL , NULL );
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insert into t2 values ('1 - 02', '2 - 02');
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select * from t1
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where (a1, a2) not in (select * from t2 where b1 is not null and b2 is not null);
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select a1, a2, (a1, a2) not in (select * from t2) as in_res from t1;
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drop table t1, t2;
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--echo
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--echo NULLs in the outer columns, no NULLs in the suqbuery
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--echo
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create table t1 (a1 char(8), a2 char(8));
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create table t2 (b1 char(8) not null, b2 char(8) not null);
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insert into t1 values (NULL , '2 - 00');
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insert into t1 values ('1 - 01', '2 - 01');
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insert into t1 values (NULL , NULL );
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insert into t2 values ('1 - 00', '2 - 00');
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insert into t2 values ('1 - 01', '2 - 01');
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insert into t2 values ('1 - 02', '2 - 00');
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select * from t1
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where (a1, a2) not in (select * from t2 where b1 is not null and b2 is not null);
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select a1, a2, (a1, a2) not in (select * from t2) as in_res from t1;
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select * from t1
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where (a1, a2) in (select * from t2 where b1 is not null and b2 is not null);
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select a1, a2, (a1, a2) in (select * from t2) as in_res from t1;
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drop table t1, t2;
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--echo
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--echo All columns require partial matching (no non-null columns)
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--echo
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--echo TODO
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--echo
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--echo Both non-NULL columns and columns with NULLs
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--echo
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--echo TODO
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--echo
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--echo Covering NULL rows
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--echo
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create table t1 (a1 char(8), a2 char(8));
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create table t2 (b1 char(8), b2 char(8));
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insert into t1 values ('1 - 00', '2 - 00');
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insert into t1 values ('1 - 01', '2 - 01');
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insert into t2 values ('1 - 01', NULL );
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insert into t2 values (NULL , '2 - 02');
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insert into t2 values (NULL , NULL );
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insert into t2 values ('1 - 02', '2 - 02');
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select * from t1
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where (a1, a2) not in (select * from t2);
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select a1, a2, (a1, a2) not in (select * from t2) as in_res from t1;
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insert into t2 values ('1 - 01', '2 - 01');
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select * from t1
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where (a1, a2) not in (select * from t2);
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select a1, a2, (a1, a2) not in (select * from t2) as in_res from t1;
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select * from t1
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where (a1, a2) in (select * from t2);
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select a1, a2, (a1, a2) in (select * from t2) as in_res from t1;
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drop table t1, t2;
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--echo
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--echo Covering NULL columns
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--echo
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--echo this case affects only the rowid-merge algorithm
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set @@optimizer_switch="partial_match_rowid_merge=on,partial_match_table_scan=off";
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create table t1 (a1 char(8) not null, a2 char(8), a3 char(8) not null);
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create table t2 (b1 char(8) not null, b2 char(8), b3 char(8) not null);
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insert into t1 values ('1 - 00', '2 - 00', '3 - 00');
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insert into t1 values ('1 - 01', '2 - 01', '3 - 01');
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insert into t2 values ('1 - 01', NULL, '3 - x1');
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insert into t2 values ('1 - 02', NULL, '3 - 02');
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insert into t2 values ('1 - 00', NULL, '3 - 00');
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select * from t1
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where (a1, a2, a3) not in (select * from t2);
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select *, (a1, a2, a3) not in (select * from t2) as in_res from t1;
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select * from t1
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where (a1, a2, a3) in (select * from t2);
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select *, (a1, a2, a3) in (select * from t2) as in_res from t1;
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drop table t1, t2;
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create table t1 (a1 char(8), a2 char(8), a3 char(8) not null);
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create table t2 (b1 char(8), b2 char(8), b3 char(8) not null);
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insert into t1 values ('1 - 00', '2 - 00', '3 - 00');
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insert into t1 values ('1 - 01', '2 - 01', '3 - 01');
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insert into t2 values (NULL, NULL, '3 - x1');
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insert into t2 values (NULL, NULL, '3 - 02');
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insert into t2 values (NULL, NULL, '3 - 00');
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select * from t1
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where (a1, a2, a3) not in (select * from t2);
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select *, (a1, a2, a3) not in (select * from t2) as in_res from t1;
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select * from t1
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where (a1, a2, a3) in (select * from t2);
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select *, (a1, a2, a3) in (select * from t2) as in_res from t1;
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drop table t1, t2;
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--echo
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--echo Covering NULL row, and a NULL column
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--echo
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create table t1 (a1 char(8) not null, a2 char(8), a3 char(8));
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create table t2 (b1 char(8), b2 char(8), b3 char(8));
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insert into t1 values ('1 - 00', '2 - 00', '3 - 00');
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insert into t1 values ('1 - 01', '2 - 01', '3 - 01');
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insert into t2 values ('1 - 01', NULL, '3 - x1');
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insert into t2 values (NULL , NULL, NULL );
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insert into t2 values ('1 - 00', NULL, '3 - 00');
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select * from t1
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where (a1, a2, a3) not in (select * from t2);
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select *, (a1, a2, a3) not in (select * from t2) as in_res from t1;
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select * from t1
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where (a1, a2, a3) in (select * from t2);
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select *, (a1, a2, a3) in (select * from t2) as in_res from t1;
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drop table t1, t2;
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--echo
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--echo Covering NULL row, and covering NULL columns
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--echo
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create table t1 (a1 char(8) not null, a2 char(8), a3 char(8));
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create table t2 (b1 char(8), b2 char(8), b3 char(8));
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insert into t1 values ('1 - 00', '2 - 00', '3 - 00');
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insert into t1 values ('1 - 01', '2 - 01', '3 - 01');
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insert into t2 values (NULL, NULL, NULL);
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insert into t2 values (NULL, NULL, NULL);
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select * from t1
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where (a1, a2, a3) not in (select * from t2);
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select *, (a1, a2, a3) not in (select * from t2) as in_res from t1;
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select * from t1
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where (a1, a2, a3) in (select * from t2);
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select *, (a1, a2, a3) in (select * from t2) as in_res from t1;
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drop table t1, t2;
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--echo -------------------------------
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--echo Part 2: Test cases for bugs.
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--echo -------------------------------
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--disable_warnings
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drop table if exists t1, t2;
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--enable_warnings
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--echo #
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--echo # LP BUG#608744
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--echo #
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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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drop table t1,t2;
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--echo #
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--echo # LP BUG#601156
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--echo #
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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 @@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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DROP TABLE t1, t2;
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--echo #
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--echo # LP BUG#613009 Crash in Ordered_key::get_field_idx
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--echo #
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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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select * from t1 where (a1, a2) not in (select a1, a2 from t1);
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drop table t1;
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--echo #
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--echo # LP BUG#680058 void Ordered_key::add_key(rownum_t):
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--echo # Assertion `key_buff_elements && cur_key_idx < key_buff_elements' failed
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--echo #
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create table t1 (f1 char(1), f2 char(1));
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insert into t1 values ('t', '0'), ('0', 't');
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create table t2 (f3 char(1), f4 char(1));
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insert into t2 values ('t', NULL), ('t', NULL), ('d', 'y');
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set @@optimizer_switch='materialization=on,partial_match_rowid_merge=on,partial_match_table_scan=off,semijoin=off';
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select * from t1 where (f1, f2) not in (select * from t2);
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drop table t1, t2;
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--echo #
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--echo # LP BUG#809245 Second assertion `bit < (map)->n_bits' with partial_match_merge
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--echo #
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CREATE TABLE t1 (d varchar(32)) ;
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INSERT INTO t1 VALUES ('r');
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CREATE TABLE t2 ( a int, c varchar(32)) ;
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INSERT INTO t2 VALUES (5,'r');
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CREATE TABLE t3 ( a int NOT NULL , d varchar(32)) ;
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INSERT INTO t3 VALUES (10,'g');
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set @@optimizer_switch='materialization=on,partial_match_rowid_merge=on,partial_match_table_scan=off,in_to_exists=off';
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EXPLAIN SELECT *
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FROM t1
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WHERE (t1.d , t1.d) NOT IN (
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SELECT t3.d , t2.c
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FROM t3 LEFT JOIN t2 ON t3.a = t2.a);
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SELECT *
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FROM t1
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WHERE (t1.d , t1.d) NOT IN (
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SELECT t3.d , t2.c
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FROM t3 LEFT JOIN t2 ON t3.a = t2.a);
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set @@optimizer_switch='materialization=off,in_to_exists=on';
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EXPLAIN SELECT *
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FROM t1
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WHERE (t1.d , t1.d) NOT IN (
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SELECT t3.d , t2.c
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FROM t3 LEFT JOIN t2 ON t3.a = t2.a);
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SELECT *
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FROM t1
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WHERE (t1.d , t1.d) NOT IN (
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SELECT t3.d , t2.c
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FROM t3 LEFT JOIN t2 ON t3.a = t2.a);
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drop table t1, t2, t3;
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--echo #
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--echo # LP BUG#809266 Diverging results with partial_match_rowid_merge=on
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--echo #
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CREATE TABLE t1 (c int) ;
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INSERT INTO t1 VALUES (0),(0);
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CREATE TABLE t2 (a int, b int) ;
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INSERT INTO t2 VALUES (6,3), (9,NULL);
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set @@optimizer_switch='materialization=on,partial_match_rowid_merge=on,partial_match_table_scan=off,in_to_exists=off';
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EXPLAIN
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SELECT * FROM t1 WHERE (6, 4 ) NOT IN (SELECT b, a FROM t2);
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SELECT * FROM t1 WHERE (6, 4 ) NOT IN (SELECT b, a FROM t2);
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EXPLAIN
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SELECT * FROM t1 WHERE (6, 4 ) NOT IN (SELECT a, b FROM t2);
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SELECT * FROM t1 WHERE (6, 4 ) NOT IN (SELECT a, b FROM t2);
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set @@optimizer_switch='materialization=off,in_to_exists=on';
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EXPLAIN
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SELECT * FROM t1 WHERE (6, 4 ) NOT IN (SELECT b, a FROM t2);
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SELECT * FROM t1 WHERE (6, 4 ) NOT IN (SELECT b, a FROM t2);
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EXPLAIN
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SELECT * FROM t1 WHERE (6, 4 ) NOT IN (SELECT a, b FROM t2);
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SELECT * FROM t1 WHERE (6, 4 ) NOT IN (SELECT a, b FROM t2);
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drop table t1, t2;
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--echo #
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--echo # LP BUG#856152 Wrong result with NOT IN subquery and partial_match_rowid_merge
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--echo #
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CREATE TABLE t1 ( f1 integer NOT NULL , f2 integer) ;
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INSERT INTO t1 VALUES (3,3),(48,NULL),(49,1);
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CREATE TABLE t2 ( f3 int) ;
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INSERT INTO t2 VALUES (5);
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set @@optimizer_switch='in_to_exists=off,materialization=on,partial_match_rowid_merge=on,partial_match_table_scan=off';
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EXPLAIN SELECT * FROM t2 WHERE ( 3 , 1 ) NOT IN ( SELECT f1 , f2 FROM t1 );
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SELECT * FROM t2 WHERE ( 3 , 1 ) NOT IN ( SELECT f1 , f2 FROM t1 );
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set @@optimizer_switch='in_to_exists=on,materialization=off';
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EXPLAIN SELECT * FROM t2 WHERE ( 3 , 1 ) NOT IN ( SELECT f1 , f2 FROM t1 );
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SELECT * FROM t2 WHERE ( 3 , 1 ) NOT IN ( SELECT f1 , f2 FROM t1 );
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drop table t1, t2;
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set @@optimizer_switch=@save_optimizer_switch;
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