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5.3 merge
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@@ -2130,6 +2130,47 @@ the value below *must* be 1
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show status like 'Created_tmp_disk_tables';
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Variable_name Value
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Created_tmp_disk_tables 1
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#
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# Bug #1002146: Unneeded filesort if usage of join buffer is not allowed
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# (bug mdev-645)
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#
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CREATE TABLE t1 (pk int PRIMARY KEY, a int, INDEX idx(a));
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INSERT INTO t1 VALUES (3,2), (2,3), (5,3), (6,4);
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CREATE TABLE t2 (pk int PRIMARY KEY, a int, INDEX idx(a));
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INSERT INTO t2 VALUES (9,0), (10,3), (6,4), (1,6), (3,100), (5,200);
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set join_cache_level=0;
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EXPLAIN
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SELECT t2.a FROM t2 STRAIGHT_JOIN t1 ON t2.a <> 0 WHERE t2.a <> 6
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GROUP BY t2.a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 range idx idx 5 NULL 5 Using where; Using index
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1 SIMPLE t1 index NULL PRIMARY 4 NULL 4 Using index
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SELECT t2.a FROM t2 STRAIGHT_JOIN t1 ON t2.a <> 0 WHERE t2.a <> 6
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GROUP BY t2.a;
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a
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3
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4
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100
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200
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set join_cache_level=default;
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set @save_optimizer_switch=@@optimizer_switch;
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set optimizer_switch='outer_join_with_cache=off';
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EXPLAIN
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SELECT t2.a FROM t2 LEFT JOIN t1 ON t2.a <> 0 WHERE t2.a <> 6
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GROUP BY t2.a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 range idx idx 5 NULL 5 Using where; Using index
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1 SIMPLE t1 index NULL PRIMARY 4 NULL 4 Using where; Using index
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SELECT t2.a FROM t2 LEFT JOIN t1 ON t2.a <> 0 WHERE t2.a <> 6
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GROUP BY t2.a;
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a
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0
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3
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4
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100
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200
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set optimizer_switch=@save_optimizer_switch;
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DROP TABLE t1,t2;
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# End of 5.3 tests
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#
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# Bug#49771: Incorrect MIN (date) when minimum value is 0000-00-00
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