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Bug#28208: Wrong result of a non-const STRING function with a const DATETIME

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function.

A wrong  condition was used to check that the
Arg_comparator::can_compare_as_dates() function calculated the value of the
string constant. When comparing a non-const STRING function with a constant
DATETIME function it leads to saving an arbitrary value as a cached value of
the DATETIME function.

Now the Arg_comparator::set_cmp_func() function initializes the const_value
variable to the impossible DATETIME value (-1) and this const_value is
cached only if it was changed by the Arg_comparator::can_compare_as_dates()
function.
This commit is contained in:
evgen@moonbone.local
2007-05-16 00:30:12 +04:00
parent 22dfb9f0f7
commit fbb2332628
3 changed files with 17 additions and 3 deletions
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6
mysql-test/r/type_datetime.result
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@@ -346,3 +346,9 @@ call test27759();
a b a_then_b b_then_a c_then_a
2007-04-10 2007-04-11 2007-04-10 2007-04-10 2004-04-09 00:00:00
drop procedure test27759;
create table t1 (f1 date);
insert into t1 values (curdate());
select left(f1,10) = curdate() from t1;
left(f1,10) = curdate()
1
drop table t1;