"Alex Hunsaker" <[EMAIL PROTECTED]> writes:
> On Thu, Sep 4, 2008 at 7:45 PM, Tom Lane <[EMAIL PROTECTED]> wrote:
>> So what we need for testing is a few different key values that hash to
>> the same code. Not sure about an easy way to find such.
> Hrm, well I have not really looked at the hash algorithm but I assume
> we could just reduce the number of buckets?
No, we need fully equal hash keys, else the code won't visit the heap.
I guess one thing we could do for testing purposes is lobotomize one of
the datatype-specific hash functions. For instance, make int8_hash
return the input mod 2^32, ignoring the upper bytes. Then it'd be easy
to compute different int8s that hash to the same thing.
regards, tom lane
--
Sent via pgsql-patches mailing list (pgsql-patches@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-patches
