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Fix for bug #31236: Inconsistent division by zero behavior for

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floating point numbers

Some math functions did not check if the result is a valid number
(i.e. neither of +-inf or nan).

Fixed by validating the result where necessary and returning NULL in
case of invalid result.
This commit is contained in:
kaa@kaamos.(none)
2008-02-20 00:33:43 +03:00
parent 947529acf3
commit 8d222210c7
11 changed files with 62 additions and 82 deletions
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14
mysql-test/t/func_math.test
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@ -248,5 +248,17 @@ INSERT INTO t1 VALUES ('a');
SELECT a DIV 2 FROM t1 UNION SELECT a DIV 2 FROM t1;
DROP TABLE t1;
--echo End of 5.0 tests
#
# Bug #31236: Inconsistent division by zero behavior for floating point numbers
#
SELECT 1e308 + 1e308;
SELECT -1e308 - 1e308;
SELECT 1e300 * 1e300;
SELECT 1e300 / 1e-300;
SELECT EXP(750);
SELECT POW(10, 309);
--echo End of 5.1 tests