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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/select_safe.result
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@ -70,7 +70,7 @@ insert into t1 values (null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(nu
explain select STRAIGHT_JOIN * from t1,t1 as t2 where t1.b=t2.b;
table type possible_keys key key_len ref rows Extra
t1 ALL b NULL NULL NULL 21
t2 ALL b NULL NULL NULL 16 Using where
t2 ref b b 21 t1.b 6 Using where
set MAX_SEEKS_FOR_KEY=1;
explain select STRAIGHT_JOIN * from t1,t1 as t2 where t1.b=t2.b;
table type possible_keys key key_len ref rows Extra