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Added thread variable max_seeks_for_key

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Change optimizer to prefer key lookups before table scan
Change table scans to be done after tables with constrains on scanned table
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monty@mashka.mysql.fi
2003-06-27 03:04:54 +03:00
parent 5f556f11e0
commit 34919a03c4
17 changed files with 114 additions and 65 deletions
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mysql-test/r/key_diff.result
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@ -36,7 +36,7 @@ a a a a
explain select t1.*,t2.* from t1,t1 as t2 where t1.A=t2.B;
table type possible_keys key key_len ref rows Extra
t1 ALL a NULL NULL NULL 5
t2 ALL b NULL NULL NULL 5 Using where
t2 ALL b NULL NULL NULL 4 Using where
select t1.*,t2.* from t1,t1 as t2 where t1.A=t2.B order by binary t1.a,t2.a;
a b a b
A B a a