| From: | Kouhei Kaigai <kaigai(at)ak(dot)jp(dot)nec(dot)com> |
|---|---|
| To: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Gavin Flower <GavinFlower(at)archidevsys(dot)co(dot)nz>, Jeff Davis <pgsql(at)j-davis(dot)com>, "Andres Freund" <andres(at)2ndquadrant(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>, "Haribabu Kommi" <kommi(dot)haribabu(at)gmail(dot)com> |
| Subject: | Re: Parallel Seq Scan |
| Date: | 2015-07-29 14:02:50 |
| Message-ID: | 9A28C8860F777E439AA12E8AEA7694F80112001E@BPXM15GP.gisp.nec.co.jp |
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| Lists: | pgsql-hackers |
Hi Amit,
Could you tell me the code intention around ExecInitFunnel()?
ExecInitFunnel() calls InitFunnel() that opens the relation to be
scanned by the underlying PartialSeqScan and setup ss_ScanTupleSlot
of its scanstate.
According to the comment of InitFunnel(), it open the relation and
takes appropriate lock on it. However, an equivalent initialization
is also done on InitPartialScanRelation().
Why does it acquire the relation lock twice?
Thanks,
--
NEC Business Creation Division / PG-Strom Project
KaiGai Kohei <kaigai(at)ak(dot)jp(dot)nec(dot)com>
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