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Merge spetrunia@bk-internal.mysql.com:/home/bk/mysql-5.1-opt

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into  mysql.com:/home/psergey/mysql-5.1-bug22393


mysql-test/t/range.test:
  Auto merged
sql/sql_select.cc:
  Auto merged
mysql-test/r/range.result:
  Manual merge
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2006-09-19 21:14:37 +04:00
parent 86b4ca8480 5e34af3240
commit d752b1a8da
3 changed files with 64 additions and 0 deletions
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mysql-test/t/range.test
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@@ -740,3 +740,30 @@ SELECT * FROM t1 WHERE item='A1' AND started<='2005-12-02 00:00:00';
DROP TABLE t1;
# End of 5.0 tests
# BUG#22393 fix: Adjust 'ref' estimate if we have 'range' estimate for
# a smaller scan interval
create table t1 (a int);
insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t2 (a int, b int, filler char(100));
insert into t2 select A.a + 10 * (B.a + 10 * C.a), 10, 'filler' from t1 A,
t1 B, t1 C where A.a < 5;
insert into t2 select 1000, b, 'filler' from t2;
alter table t2 add index (a,b);
# t2 values
# ( 1 , 10, 'filler')
# ( 2 , 10, 'filler')
# ( 3 , 10, 'filler')
# (... , 10, 'filler')
# ...
# (1000, 10, 'filler') - 500 times
# 500 rows, 1 row
select 'In following EXPLAIN the access method should be ref, #rows~=500 (and not 2)' Z;
explain select * from t2 where a=1000 and b<11;
drop table t1, t2;