| From: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
|---|---|
| To: | Haribabu Kommi <kommi(dot)haribabu(at)gmail(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Andres Freund <andres(at)2ndquadrant(dot)com>, Kouhei Kaigai <kaigai(at)ak(dot)jp(dot)nec(dot)com>, Amit Langote <amitlangote09(at)gmail(dot)com>, Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp>, Fabrízio Mello <fabriziomello(at)gmail(dot)com>, Thom Brown <thom(at)linux(dot)com>, Stephen Frost <sfrost(at)snowman(dot)net>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Parallel Seq Scan |
| Date: | 2015-03-10 04:09:51 |
| Message-ID: | CAA4eK1LZMJNMkR3gP0g0Mo1K4iGj5z8s-oOb4WT1dd=JgQjNxQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, Mar 10, 2015 at 6:50 AM, Haribabu Kommi <kommi(dot)haribabu(at)gmail(dot)com>
wrote:
>
> On Tue, Mar 10, 2015 at 1:38 AM, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>
wrote:
> >
> > Assuming previous patch is in right direction, I have enabled
> > join support for the patch and done some minor cleanup of
> > patch which leads to attached new version.
>
> Is this patch handles the cases where the re-scan starts without
> finishing the earlier scan?
>
Do you mean to say cases like ANTI, SEMI Join (in nodeNestLoop.c)
where we scan the next outer tuple and rescan inner table without
completing the previous scan of inner table?
I have currently modelled it based on existing rescan for seqscan
(ExecReScanSeqScan()) which means it will begin the scan again.
Basically if the workers are already started/initialized by previous
scan, then re-initialize them (refer function ExecReScanFunnel() in
patch).
Can you elaborate more if you think current handling is not sufficient
for any case?
With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com
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