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Post-push fix to disable a subset of the test case for Bug#47762.

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This has been back-ported from 6.0 as the problems proved to afflict 
5.1 as well.
The fix exposed two new bugs. They were reported as follows.
      
Bug no 52174: Sometimes wrong plan when reading a MAX value 
from non-NULL index
      
Bug no 52173: Reading NULL value from non-NULL index gives wrong 
result in embedded server 
      
Both bugs taken together affect a much smaller class of queries than #47762, 
so the fix stays for now.
This commit is contained in:
Martin Hansson 2010-03-19 09:23:44 +01:00
parent d1c2e8508f
commit a76b8f9a1d
3 changed files with 26 additions and 8 deletions
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4
mysql-test/include/min_null_cond.inc
View file

@ -18,11 +18,13 @@ EXPLAIN
SELECT MIN( a ) FROM t1 WHERE a < NULL;
SELECT MIN( a ) FROM t1 WHERE a < NULL;
if (!$skip_null_safe_test)
{
--replace_column 1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9 x
EXPLAIN
SELECT MIN( a ) FROM t1 WHERE a <=> NULL;
SELECT MIN( a ) FROM t1 WHERE a <=> NULL;
}
--replace_column 1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9 x
EXPLAIN
SELECT MIN( a ) FROM t1 WHERE a BETWEEN NULL AND 10;

18
mysql-test/r/group_min_max.result
View file

@ -2691,6 +2691,17 @@ DROP TABLE t1;
## Test for NOT NULLs
CREATE TABLE t1 ( a INT NOT NULL PRIMARY KEY);
INSERT INTO t1 VALUES (1), (2), (3);
#
# NULL-safe operator test disabled for non-NULL indexed columns.
#
# See bugs
#
# - Bug#52173: Reading NULL value from non-NULL index gives
# wrong result in embedded server
#
# - Bug#52174: Sometimes wrong plan when reading a MAX value from
# non-NULL index
#
EXPLAIN
SELECT MIN( a ) FROM t1 WHERE a = NULL;
id select_type table type possible_keys key key_len ref rows Extra
@ -2720,13 +2731,6 @@ SELECT MIN( a ) FROM t1 WHERE a < NULL;
MIN( a )
NULL
EXPLAIN
SELECT MIN( a ) FROM t1 WHERE a <=> NULL;
id select_type table type possible_keys key key_len ref rows Extra
x x x x x x x x x No matching min/max row
SELECT MIN( a ) FROM t1 WHERE a <=> NULL;
MIN( a )
NULL
EXPLAIN
SELECT MIN( a ) FROM t1 WHERE a BETWEEN NULL AND 10;
id select_type table type possible_keys key key_len ref rows Extra
x x x x x x x x x Impossible WHERE noticed after reading const tables

12
mysql-test/t/group_min_max.test
View file

@ -1070,6 +1070,18 @@ DROP TABLE t1;
--echo ## Test for NOT NULLs
CREATE TABLE t1 ( a INT NOT NULL PRIMARY KEY);
INSERT INTO t1 VALUES (1), (2), (3);
--echo #
--echo # NULL-safe operator test disabled for non-NULL indexed columns.
--echo #
--echo # See bugs
--echo #
--echo # - Bug#52173: Reading NULL value from non-NULL index gives
--echo # wrong result in embedded server
--echo #
--echo # - Bug#52174: Sometimes wrong plan when reading a MAX value from
--echo # non-NULL index
--echo #
--let $skip_null_safe_test= 1
--source include/min_null_cond.inc
DROP TABLE t1;