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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/heap.result
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@ -166,7 +166,7 @@ alter table t1 add column new_col char(1) not null, add key (btn,new_col), drop
update t1 set new_col=btn;
explain select * from t1 where btn="a";
table type possible_keys key key_len ref rows Extra
t1 ALL btn NULL NULL NULL 14 Using where
t1 ALL btn NULL NULL NULL 11 Using where
explain select * from t1 where btn="a" and new_col="a";
table type possible_keys key key_len ref rows Extra
t1 ref btn btn 11 const,const 10 Using where