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Fixed bug in the optimiser for FULL TABLE SCAN case:

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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
This commit is contained in:
unknown
2003-09-15 22:21:39 +04:00
parent cdbc2fe43a
commit db03c7e89f
4 changed files with 27 additions and 29 deletions
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2
mysql-test/r/join_outer.result
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@ -615,7 +615,7 @@ INSERT INTO t2 VALUES (1,1);
explain SELECT * from t1 left join t2 on t1.id=t2.id where t2.id IS NULL;
table type possible_keys key key_len ref rows Extra
t1 ALL NULL NULL NULL NULL 2
t2 index id id 8 NULL 1 Using where; Using index; Not exists
t2 ref id id 4 t1.id 1 Using where; Using index; Not exists
SELECT * from t1 left join t2 on t1.id=t2.id where t2.id IS NULL;
id name id idx
2 no NULL NULL