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BUG#16393: Let the 'ref' optimizer use ON condition of nested join to construct

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'ref' accesses to all tables that are direct children of the nested join and are 
not inner wrt their siblings.


mysql-test/r/join_nested.result:
  Testcase for BUG#16393
mysql-test/t/join_nested.test:
  Testcase for BUG#16393
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unknown
2006-01-13 23:55:30 +03:00
parent bf1ebe98df
commit 2956a79b93
3 changed files with 99 additions and 15 deletions
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14
mysql-test/t/join_nested.test
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@@ -900,3 +900,17 @@ explain select * from t2 left join
join t5 on t5.a=t3.b) on t3.a=t2.b;
drop table t0, t1, t2, t3, t4, t5, t6, t7;
# BUG#16393
create table t1 (a int);
insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t2 (a int, filler char(100), key(a));
insert into t2 select A.a + 10*B.a, '' from t1 A, t1 B;
create table t3 like t2;
insert into t3 select * from t2;
explain select * from t1 left join
(t2 left join t3 on (t2.a = t3.a))
on (t1.a = t2.a);
drop table t1, t2, t3;