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author | unknown <hf@deer.(none)> | 2003-12-12 21:26:20 +0400 |
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committer | unknown <hf@deer.(none)> | 2003-12-12 21:26:20 +0400 |
commit | e205d96d3f5ada439ed4bfbffeb93149ccccb750 (patch) | |
tree | ba27c057d64a301e15acd992f4117e0d62eb5108 /mysql-test/t/join_outer.test | |
parent | e21c799dde9e9fbcd3e89f757b352eb9589a82f4 (diff) | |
download | mariadb-git-e205d96d3f5ada439ed4bfbffeb93149ccccb750.tar.gz |
Proposed fix for #2093
it happens because of the LEFT JOINT optimization in add_key_part()
This optimization does exactly the same in JOIN and in WHERE conditions
Not right.
I moved that optimization one level upper.
mysql-test/r/join_outer.result:
appropriate test result
mysql-test/t/join_outer.test:
test case
sql/sql_select.cc:
optimizing of the left_join now only for WHERE conditions
and for first table in list
Diffstat (limited to 'mysql-test/t/join_outer.test')
-rw-r--r-- | mysql-test/t/join_outer.test | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/mysql-test/t/join_outer.test b/mysql-test/t/join_outer.test index ee7d55d2a4e..bed4d4b033b 100644 --- a/mysql-test/t/join_outer.test +++ b/mysql-test/t/join_outer.test @@ -437,3 +437,16 @@ select * from t1 left outer join t2 using (f2) left outer join t3 using (f3); drop table t1,t2,t3; + +create table t1 (a1 int, a2 int); +create table t2 (b1 int not null, b2 int); +create table t3 (c1 int, c2 int); + +insert into t1 values (1,2), (2,2), (3,2); +insert into t2 values (1,3), (2,3); +insert into t3 values (2,4), (3,4); + +select * from t1 left join t2 on b1 = a1 left join t3 on c1 = a1 and b1 is null; +explain select * from t1 left join t2 on b1 = a1 left join t3 on c1 = a1 and b1 is null; + +drop table t1, t2, t3; |