Added thread variable max_seeks_for_key

Change optimizer to prefer key lookups before table scan
Change table scans to be done after tables with constrains on scanned table 


mysql-test/r/distinct.result:
  Update results
mysql-test/r/group_by.result:
  Update results
mysql-test/r/heap.result:
  Update results
mysql-test/r/join.result:
  Update results
mysql-test/r/key_diff.result:
  Update results
mysql-test/r/myisam.result:
  Update results
mysql-test/r/order_by.result:
  Update results
mysql-test/r/select_safe.result:
  Update results
mysql-test/t/distinct.test:
  Change test to be repeatable
mysql-test/t/join.test:
  Change test to be repeatable
mysql-test/t/select_safe.test:
  Add tests for MAX_SEEKS_FOR_KEY
sql/handler.h:
  Optimize structure for 64 bit machines (and to avoid problems with gdb)
sql/item_cmpfunc.cc:
  Initialize not_null_tables_cache properly
sql/mysqld.cc:
  Added max_seeks_for_key
sql/set_var.cc:
  Added max_seeks_for_key
sql/sql_class.h:
  Added max_seeks_for_key
sql/sql_select.cc:
  Added max_seeks_for_key
  Change optimizer to prefer key lookups before table scan.
  Change table scans to be done after tables with constrains on scanned table

1 files changed, 1 insertions, 4 deletions

diff --git a/mysql-test/t/join.test b/mysql-test/t/join.test
index 08cc5731723..19e04d2aa7e 100644
--- a/mysql-test/t/join.test
+++ b/mysql-test/t/join.test
@@ -98,10 +98,7 @@ CREATE TABLE t2 (
 INSERT INTO t2 VALUES (3,2,11,12,5400,7800);
 INSERT INTO t2 VALUES (4,2,25,12,6500,11200);
 INSERT INTO t2 VALUES (5,1,37,6,10000,12000);
-
-select a.id, b.category as catid, b.state as stateid, b.county as
-countyid from t1 a, t2 b where (a.token =
-'a71250b7ed780f6ef3185bfffe027983') and (a.count = b.id);
+select a.id, b.category as catid, b.state as stateid, b.county as countyid from t1 a, t2 b ignore index (primary) where (a.token ='a71250b7ed780f6ef3185bfffe027983') and (a.count = b.id);
 select a.id, b.category as catid, b.state as stateid, b.county as
 countyid from t1 a, t2 b where (a.token =
 'a71250b7ed780f6ef3185bfffe027983') and (a.count = b.id) order by a.id;