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Fix bug#11482 4.1.12 produces different resultset for a complex query

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than in previous 4.1.x

Wrongly applied optimization were adding NOT NULL constraint which results in
rejecting valid rows and reduced result set.

The problem was that add_notnull_conds() while checking subquery were adding
NOT NULL constraint to left joined table, to which, normally, optimization 
don't have to be applied.


sql/sql_select.cc:
  Fix bug #11482 Wrongly applied optimization was erroneously rejecting valid rows
  Constraint were added to optimization appliance test.
mysql-test/t/select.test:
  Test case for bug #11482  Wrongly applied optimization was erroneously rejecting valid rows
mysql-test/r/select.result:
  Test case for bug #11482  Wrongly applied optimization was erroneously rejecting valid rows
This commit is contained in:
unknown
2005-07-16 03:29:12 +04:00
parent dba3190474
commit 0f41fb4234
3 changed files with 41 additions and 1 deletions
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11
mysql-test/r/select.result
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@ -2559,3 +2559,14 @@ WHERE
COUNT(*)
4
drop table t1,t2,t3;
create table t1 (f1 int);
insert into t1 values (1),(NULL);
create table t2 (f2 int, f3 int, f4 int);
create index idx1 on t2 (f4);
insert into t2 values (1,2,3),(2,4,6);
select A.f2 from t1 left join t2 A on A.f2 = f1 where A.f3=(select min(f3)
from t2 C where A.f4 = C.f4) or A.f3 IS NULL;
f2
1
NULL
drop table t1,t2;

11
mysql-test/t/select.test
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@ -2116,3 +2116,14 @@ WHERE
drop table t1,t2,t3;
#
# Bug #11482 4.1.12 produces different resultset for a complex query
# than in previous 4.1.x
create table t1 (f1 int);
insert into t1 values (1),(NULL);
create table t2 (f2 int, f3 int, f4 int);
create index idx1 on t2 (f4);
insert into t2 values (1,2,3),(2,4,6);
select A.f2 from t1 left join t2 A on A.f2 = f1 where A.f3=(select min(f3)
from t2 C where A.f4 = C.f4) or A.f3 IS NULL;
drop table t1,t2;