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Bug#23656: Wrong conversion result of a DATETIME to integer using CAST function.

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The generic string to int conversion was used by the Item_func_signed and
the Item_func_unsigned classes to convert DATE/DATETIME values to the
SIGNED/UNSIGNED type. But this conversion produces wrong results for such
values.

Now if the item which result has to be converted can return its result as
longlong then the item->val_int() method is used to allow the item to carry
out the conversion itself and return the correct result.
This condition is checked in the Item_func_signed::val_int() and the
Item_func_unsigned::val_int() functions.
This commit is contained in:
evgen@moonbone.local
2007-05-04 00:53:37 +04:00
parent 395d8751d5
commit 7f9411c156
3 changed files with 16 additions and 2 deletions
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6
mysql-test/r/cast.result
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@@ -281,4 +281,10 @@ DROP TABLE t1;
select isnull(date(NULL)), isnull(cast(NULL as DATE));
isnull(date(NULL)) isnull(cast(NULL as DATE))
1 1
SELECT CAST(cast('01-01-01' as date) AS UNSIGNED);
CAST(cast('01-01-01' as date) AS UNSIGNED)
20010101
SELECT CAST(cast('01-01-01' as date) AS SIGNED);
CAST(cast('01-01-01' as date) AS SIGNED)
20010101
End of 4.1 tests