Re: hacking postgres hashjoin algorithm

from my understanding, postgres first needs to partition the tables.
ExecHashTableCreate() is the function that partitions the tables right?

Martijn van Oosterhout wrote:
> On Sun, Oct 15, 2006 at 11:08:18PM -0400, HS wrote:
>> Hello there
>>
>> I am trying to play around with the hashjoin algorithm in postgres.
>>
>> I am using the statement like
>> Select count(*) from r,s where r.id=s.id;
>>
>> I looked at the function ExecHashJoin() in nodeHashjoin.c and cannot
>> find where the algorithm is comparing if r.id equals s.id
>
> The code doing the work is actually ExecScanHashBucket() which is in
> nodeHash.c. The actual check is done by the ExecQual there...
>
> Hope this helps,