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192427e37d
There was a bug in JOIN::make_notnull_conds_for_range_scans() when clearing TABLE->tmp_set, which was used to mark fields that could not be null. This function was only used if 'not_null_range_scan=on' is set. The effect was that tmp_set contained a 'random value' and this caused the optimizer to think that some fields could not be null. FLUSH TABLES clears tmp_set and because of this things worked temporarily. Fixed by clearing tmp_set properly.
76 lines
2.5 KiB
Text
76 lines
2.5 KiB
Text
drop table if exists t1;
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create table t1 (nr int(5) not null auto_increment,b blob,str char(10), primary key (nr));
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select count(*) from t1;
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count(*)
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0
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select * from t1;
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nr b str
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select * from t1 limit 0;
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nr b str
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show status like "Empty_queries";
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Variable_name Value
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Empty_queries 2
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drop table t1;
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select * from t2;
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ERROR 42S02: Table 'test.t2' doesn't exist
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show status like "Empty_queries";
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Variable_name Value
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Empty_queries 2
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# End of 4.1 tests
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#
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# MDEV-30333 Wrong result with not_null_range_scan and LEFT JOIN with empty table
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#
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set @save_optimizer_switch=@@optimizer_switch;
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CREATE TABLE t1 (a INT, b INT) ENGINE=MyISAM;
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INSERT INTO t1 (b) VALUES (1),(2);
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CREATE TABLE t2 (c INT) ENGINE=MyISAM;
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SET optimizer_switch= 'not_null_range_scan=off';
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explain extended SELECT b FROM t1 LEFT JOIN t2 ON t2.c = a WHERE a IS NULL ORDER BY b;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t2 system NULL NULL NULL NULL 0 0.00 Const row not found
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1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00 Using where; Using filesort
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Warnings:
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Note 1003 select `test`.`t1`.`b` AS `b` from `test`.`t1` where `test`.`t1`.`a` is null order by `test`.`t1`.`b`
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SELECT b FROM t1 LEFT JOIN t2 ON t2.c = a WHERE a IS NULL ORDER BY b;
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b
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1
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2
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SET optimizer_switch = 'not_null_range_scan=on';
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explain extended SELECT b FROM t1 LEFT JOIN t2 ON t2.c = a WHERE a IS NULL ORDER BY b;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t2 system NULL NULL NULL NULL 0 0.00 Const row not found
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1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00 Using where; Using filesort
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Warnings:
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Note 1003 select `test`.`t1`.`b` AS `b` from `test`.`t1` where `test`.`t1`.`a` is null order by `test`.`t1`.`b`
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SELECT b FROM t1 LEFT JOIN t2 ON t2.c = a WHERE a IS NULL ORDER BY b;
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b
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1
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2
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flush tables;
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SELECT b FROM t1 LEFT JOIN t2 ON t2.c = a WHERE a IS NULL ORDER BY b;
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b
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1
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2
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drop table t1,t2;
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# Second test in MDEV-30333
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CREATE TABLE t1 (a int, b varchar(10)) ENGINE=MyISAM;
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INSERT INTO t1 VALUES (69,'foo'),(71,'bar');
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CREATE TABLE t2 (c int) ENGINE=MyISAM;
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INSERT INTO t2 VALUES (1),(2);
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CREATE TABLE t3 (d int, e int, KEY(e)) ENGINE=MyISAM;
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SELECT * FROM t1 LEFT JOIN t2 LEFT JOIN t3 ON t3.e = t3.d ON 1;
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a b c d e
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69 foo 1 NULL NULL
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71 bar 1 NULL NULL
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69 foo 2 NULL NULL
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71 bar 2 NULL NULL
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SET optimizer_switch = 'not_null_range_scan=on';
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SELECT * FROM t1 LEFT JOIN t2 LEFT JOIN t3 ON t3.e = t3.d ON 1;
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a b c d e
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69 foo 1 NULL NULL
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71 bar 1 NULL NULL
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69 foo 2 NULL NULL
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71 bar 2 NULL NULL
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DROP TABLE t1, t2, t3;
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set @@optimizer_switch=@save_optimizer_switch;
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End of 10.5 tests
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