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join_nested.test, join_nested.result:

Browse Source 
Added a case for bug #4976 when one of the inner tables is empty.
select.result, join.result:
  Reversed the previous change of the erronious fix for bug #4976.
sql_select.cc:
  The previous fix for bug 4976 was reversed as it
  erroniously converted an outer join into an innner join
  when on_expression does not refer to outer tables.
  This is not valid if inner tables return an empty set.
  Setting dependency on outer tables was added for the above cases.
  To fix the crash in the test case of bug #4976  
  a guard was added that blocks running the crashing code for
  nested outer joins.
This commit is contained in:
igor@rurik.mysql.com
2004-08-12 23:41:06 -07:00
parent c92db89c44
commit 49094f58f9
5 changed files with 125 additions and 12 deletions
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102
mysql-test/r/join_nested.result
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@ -1218,12 +1218,106 @@ INSERT INTO t2 VALUES (NULL), (0), (1), (2), (3), (4), (5), (6), (7), (8), (9),
INSERT INTO t3 VALUES (0), (1), (2), (3), (4), (5);
EXPLAIN SELECT a, b, c FROM t1 LEFT JOIN (t2, t3) ON c < 3 and b = c;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 index c c 5 NULL 6 Using where; Using index
1 SIMPLE t2 ref b b 5 test.t3.c 2 Using where; Using index
1 SIMPLE t1 index NULL a 5 NULL 21 Using index
1 SIMPLE t3 index c c 5 NULL 6 Using index
1 SIMPLE t2 ref b b 5 test.t3.c 2 Using index
EXPLAIN SELECT a, b, c FROM t1 LEFT JOIN (t2, t3) ON b < 3 and b = c;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range b b 5 NULL 3 Using where; Using index
1 SIMPLE t3 ref c c 5 test.t2.b 2 Using where; Using index
1 SIMPLE t1 index NULL a 5 NULL 21 Using index
1 SIMPLE t3 index c c 5 NULL 6 Using index
1 SIMPLE t2 ref b b 5 test.t3.c 2 Using index
SELECT a, b, c FROM t1 LEFT JOIN (t2, t3) ON b < 3 and b = c;
a b c
NULL 0 0
NULL 1 1
NULL 2 2
0 0 0
0 1 1
0 2 2
1 0 0
1 1 1
1 2 2
2 0 0
2 1 1
2 2 2
3 0 0
3 1 1
3 2 2
4 0 0
4 1 1
4 2 2
5 0 0
5 1 1
5 2 2
6 0 0
6 1 1
6 2 2
7 0 0
7 1 1
7 2 2
8 0 0
8 1 1
8 2 2
9 0 0
9 1 1
9 2 2
10 0 0
10 1 1
10 2 2
11 0 0
11 1 1
11 2 2
12 0 0
12 1 1
12 2 2
13 0 0
13 1 1
13 2 2
14 0 0
14 1 1
14 2 2
15 0 0
15 1 1
15 2 2
16 0 0
16 1 1
16 2 2
17 0 0
17 1 1
17 2 2
18 0 0
18 1 1
18 2 2
19 0 0
19 1 1
19 2 2
DELETE FROM t3;
EXPLAIN SELECT a, b, c FROM t1 LEFT JOIN (t2, t3) ON b < 3 and b = c;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL a 5 NULL 21 Using index
1 SIMPLE t3 index c c 5 NULL 0 Using index
1 SIMPLE t2 ref b b 5 test.t3.c 2 Using index
SELECT a, b, c FROM t1 LEFT JOIN (t2, t3) ON b < 3 and b = c;
a b c
NULL NULL NULL
0 NULL NULL
1 NULL NULL
2 NULL NULL
3 NULL NULL
4 NULL NULL
5 NULL NULL
6 NULL NULL
7 NULL NULL
8 NULL NULL
9 NULL NULL
10 NULL NULL
11 NULL NULL
12 NULL NULL
13 NULL NULL
14 NULL NULL
15 NULL NULL
16 NULL NULL
17 NULL NULL
18 NULL NULL
19 NULL NULL
DROP TABLE t1,t2,t3;