database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-07-30 16:24:05 +03:00
Code Activity

Fix for BUG#9622: Make index statistics collection in MyISAM behave the same

Browse Source 
way in ALTER TABLE ... ENABLE KEYS, ANALYZE TABLE and after bulk insert:
now statistics collection always assumes NULLs are inequal. 


mysql-test/r/myisam.result:
  Testcase for BUG#9622
mysql-test/t/myisam.test:
  Testcase for BUG#9622
This commit is contained in:
unknown
2005-05-14 00:21:53 +02:00
parent 1fb790d3f0
commit f8bb892314
3 changed files with 64 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
mysql-test/r/myisam.result
View File

@ -581,3 +581,17 @@ check table t1;
Table Op Msg_type Msg_text
test.t1 check status OK
drop table t1;
create table t1 (a int, key(a));
insert into t1 values (1),(2),(3),(4),(NULL),(NULL),(NULL),(NULL);
analyze table t1;
Table Op Msg_type Msg_text
test.t1 analyze status OK
show keys from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t1 1 a 1 a A 8 NULL NULL YES BTREE
alter table t1 disable keys;
alter table t1 enable keys;
show keys from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t1 1 a 1 a A 8 NULL NULL YES BTREE
drop table t1;

15
mysql-test/t/myisam.test
View File

@ -560,3 +560,18 @@ update t1 set c2='A B' where c1=2;
check table t1;
drop table t1;
# BUG#9622 - ANALYZE TABLE and ALTER TABLE .. ENABLE INDEX produce
# different statistics on the same table with NULL values.
create table t1 (a int, key(a));
insert into t1 values (1),(2),(3),(4),(NULL),(NULL),(NULL),(NULL);
analyze table t1;
show keys from t1;
alter table t1 disable keys;
alter table t1 enable keys;
show keys from t1;
drop table t1;