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| author | unknown <gkodinov/kgeorge@magare.gmz> | 2007-10-05 17:28:34 +0300 |
|---|---|---|
| committer | unknown <gkodinov/kgeorge@magare.gmz> | 2007-10-05 17:28:34 +0300 |
| commit | 10cde5e4b1c8716c8e76259041b35456795f6906 (patch) | |
| tree | 95dd19af11e1dc3bca25d0a65b698bef67e312e1 /mysql-test/t/join.test | |
| parent | 7e5f4fe24b0fcd8801cd3d8c0d0968c6e9431dc2 (diff) | |
| download | mariadb-git-10cde5e4b1c8716c8e76259041b35456795f6906.tar.gz | |
Bug #31094: Forcing index-based sort doesn't work anymore if joins are done
A rule was introduced by the 5.1 part of the fix for bug 27531 to
prefer filesort over indexed ORDER BY when accessing all of the rows of a
table (because it's faster). This new rule was not accounting for the
presence of a LIMIT clause.
Fixed the condition for this rule so it will prefer filesort over
indexed ORDER BY only if no LIMIT.
mysql-test/r/compress.result:
Bug #31094: LIMIT is not considered a full index scan
mysql-test/r/join.result:
Bug #31094: test case
mysql-test/r/select.result:
Bug #31094: LIMIT is not considered a full index scan
mysql-test/r/ssl.result:
Bug #31094: LIMIT is not considered a full index scan
mysql-test/r/ssl_compress.result:
Bug #31094: LIMIT is not considered a full index scan
mysql-test/t/join.test:
Bug #31094: test case
sql/sql_select.cc:
Bug #31094: prefer filesort over indexed ORDER BY only if no LIMIT
Diffstat (limited to 'mysql-test/t/join.test')
| -rw-r--r-- | mysql-test/t/join.test | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/mysql-test/t/join.test b/mysql-test/t/join.test index 14c98431970..ed1b84bb5ec 100644 --- a/mysql-test/t/join.test +++ b/mysql-test/t/join.test @@ -698,4 +698,33 @@ select '^^: The above should be ~= 20 + cost(select * from t1). Value less than drop table t1, t2; +# +# Bug #31094: Forcing index-based sort doesn't work anymore if joins are +# done +# + +CREATE TABLE t1 (a INT PRIMARY KEY, b INT); +CREATE TABLE t2 (c INT PRIMARY KEY, d INT); + +INSERT INTO t1 VALUES(1,NULL),(2,NULL),(3,NULL),(4,NULL); +INSERT INTO t1 SELECT a + 4, b FROM t1; +INSERT INTO t1 SELECT a + 8, b FROM t1; +INSERT INTO t1 SELECT a + 16, b FROM t1; +INSERT INTO t1 SELECT a + 32, b FROM t1; +INSERT INTO t1 SELECT a + 64, b FROM t1; +INSERT INTO t2 SELECT a, b FROM t1; + +#expect indexed ORDER BY +EXPLAIN SELECT * FROM t1 JOIN t2 ON b=c ORDER BY a LIMIT 2; +EXPLAIN SELECT * FROM t1 JOIN t2 ON a=c ORDER BY a LIMIT 2; +SELECT * FROM t1 JOIN t2 ON b=c ORDER BY a LIMIT 2; +SELECT * FROM t1 JOIN t2 ON a=c ORDER BY a LIMIT 2; + +#expect filesort +EXPLAIN SELECT * FROM t1 JOIN t2 ON b=c ORDER BY a; +EXPLAIN SELECT * FROM t1 JOIN t2 ON a=c ORDER BY a; +SELECT * FROM t1 JOIN t2 ON b=c ORDER BY a; +SELECT * FROM t1 JOIN t2 ON a=c ORDER BY a; + +DROP TABLE IF EXISTS t1,t2; --echo End of 5.0 tests. |