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,

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