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Fixed bug mdev-12099.

Browse source 
The function mysql_derived_merge() erroneously did not mark newly formed
AND formulas in ON conditions with the flag abort_on_null. As a result
not_null_tables() calculated incorrectly for these conditions. This
could prevent conversion of embedded outer joins into inner joins.

Changed a test case from table_elim.test to preserve the former execution
plan.
This commit is contained in:
Igor Babaev 2017-02-26 15:40:18 -08:00
commit 5a0fff50f8
5 changed files with 151 additions and 4 deletions
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5
mysql-test/r/table_elim.result
View file

@ -597,7 +597,8 @@ CREATE TABLE t1 (a int(11), b varchar(1)) ;
INSERT IGNORE INTO t1 VALUES (0,'g');
CREATE TABLE t3 ( a varchar(1)) ;
INSERT IGNORE INTO t3 VALUES ('g');
CREATE TABLE t2 ( a int(11) NOT NULL, PRIMARY KEY (a)) ;
CREATE TABLE t2 ( a int(11) NOT NULL, PRIMARY KEY (a));
INSERT INTO t2 VALUES (9), (10);
create view v1 as SELECT t1.* FROM t1 LEFT JOIN t2 ON ( t1.a = t2.a ) WHERE t2.a <> 0;
SELECT alias1.* FROM t3 LEFT JOIN v1 as alias1 ON ( t3.a = alias1.b );
a b
@ -606,7 +607,7 @@ EXPLAIN SELECT alias1.* FROM t3 LEFT JOIN v1 as alias1 ON ( t3.a = alias1.b );
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 system NULL NULL NULL NULL 1
1 SIMPLE t1 ALL NULL NULL NULL NULL 1 Using where
1 SIMPLE t2 eq_ref PRIMARY PRIMARY 4 test.t1.a 1 Using where; Using index
1 SIMPLE t2 eq_ref PRIMARY PRIMARY 4 test.t1.a 1 Using index
drop view v1;
DROP TABLE t1,t2,t3;
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