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

Replaced a lame implementation of the function sel_trees_must_be_ored

Browse Source 
that blocked building index merge plans for the queries with where
conditions of the form 
(key1|2_p1=c AND range(key1_p2)) OR (key1|2_p1=c AND range(key2_p2)).

The problem was discovered by Sergey Petrunia when he reviewed the patch
for WL#24.

Added new test cases. One of them failed to produce an index merge plan
before the patch was applied.
This commit is contained in:
Igor Babaev
2009-10-29 11:49:58 -07:00
parent da47ee7ef9
commit 27191a30c0
4 changed files with 214 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

62
mysql-test/r/range_vs_index_merge.result
View File

@ -1076,6 +1076,68 @@ ID BETWEEN 3500 AND 3800) AND Country='USA'
AND (Name LIKE 'Pho%' OR ID BETWEEN 4000 AND 4300);
ID Name Country Population
3798 Phoenix USA 1321045
DROP INDEX Population ON City;
DROP INDEX Name ON City;
EXPLAIN
SELECT * FROM City
WHERE Country='USA' AND Population BETWEEN 101000 AND 102000 OR
Country='USA' AND Name LIKE 'Pa%';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE City index_merge Country,CountryPopulation,CountryName CountryPopulation,CountryName 7,38 NULL 10 Using sort_union(CountryPopulation,CountryName); Using where
SELECT * FROM City USE INDEX()
WHERE Country='USA' AND Population BETWEEN 101000 AND 102000 OR
Country='USA' AND Name LIKE 'Pa%';
ID Name Country Population
3932 Paterson USA 149222
3943 Pasadena USA 141674
3953 Pasadena USA 133936
3967 Paradise USA 124682
3986 Palmdale USA 116670
4030 Sandy USA 101853
4031 Athens-Clarke County USA 101489
4032 Cambridge USA 101355
SELECT * FROM City
WHERE Country='USA' AND Population BETWEEN 101000 AND 102000 OR
Country='USA' AND Name LIKE 'Pa%';
ID Name Country Population
3932 Paterson USA 149222
3943 Pasadena USA 141674
3953 Pasadena USA 133936
3967 Paradise USA 124682
3986 Palmdale USA 116670
4030 Sandy USA 101853
4031 Athens-Clarke County USA 101489
4032 Cambridge USA 101355
EXPLAIN
SELECT * FROM City
WHERE Country='USA' AND
(Population BETWEEN 101000 AND 102000 OR Name LIKE 'Pa%');
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE City index_merge Country,CountryPopulation,CountryName CountryPopulation,CountryName 7,38 NULL 10 Using sort_union(CountryPopulation,CountryName); Using where
SELECT * FROM City
WHERE Country='USA' AND
(Population BETWEEN 101000 AND 102000 OR Name LIKE 'Pa%');
ID Name Country Population
3932 Paterson USA 149222
3943 Pasadena USA 141674
3953 Pasadena USA 133936
3967 Paradise USA 124682
3986 Palmdale USA 116670
4030 Sandy USA 101853
4031 Athens-Clarke County USA 101489
4032 Cambridge USA 101355
SELECT * FROM City
WHERE Country='USA' AND
(Population BETWEEN 101000 AND 102000 OR Name LIKE 'Pa%');
ID Name Country Population
3932 Paterson USA 149222
3943 Pasadena USA 141674
3953 Pasadena USA 133936
3967 Paradise USA 124682
3986 Palmdale USA 116670
4030 Sandy USA 101853
4031 Athens-Clarke County USA 101489
4032 Cambridge USA 101355
DROP DATABASE world;
use test;
CREATE TABLE t1 (