From db03c7e89f6ff78f04bbab2fdc3b136525fdb8e3 Mon Sep 17 00:00:00 2001 From: unknown Date: Mon, 15 Sep 2003 22:21:39 +0400 Subject: Fixed bug in the optimiser for FULL TABLE SCAN case: to estimate correctly cost of full table scan we should take into account rows read and skipped on each iteration. mysql-test/r/distinct.result: Fixed test suite: now full scan is used less often mysql-test/r/join_outer.result: Fixed test suite: now full scan is used less often mysql-test/r/select_safe.result: Fixed test suite: now full scan is used less often --- mysql-test/r/distinct.result | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'mysql-test/r/distinct.result') diff --git a/mysql-test/r/distinct.result b/mysql-test/r/distinct.result index 1dbccb65748..da0c6a5eb72 100644 --- a/mysql-test/r/distinct.result +++ b/mysql-test/r/distinct.result @@ -173,9 +173,9 @@ INSERT INTO t2 values (1),(2),(3); INSERT INTO t3 VALUES (1,'1'),(2,'2'),(1,'1'),(2,'2'); explain SELECT distinct t3.a FROM t3,t2,t1 WHERE t3.a=t1.b AND t1.a=t2.a; table type possible_keys key key_len ref rows Extra -t3 index a a 5 NULL 6 Using index; Using temporary -t2 index a a 4 NULL 5 Using index; Distinct -t1 eq_ref PRIMARY PRIMARY 4 t2.a 1 Using where; Distinct +t2 index a a 4 NULL 5 Using index; Using temporary +t1 eq_ref PRIMARY PRIMARY 4 t2.a 1 +t3 index a a 5 NULL 5 Using where; Using index SELECT distinct t3.a FROM t3,t2,t1 WHERE t3.a=t1.b AND t1.a=t2.a; a 1 -- cgit v1.2.1