| From: | David Rowley <david(dot)rowley(at)2ndquadrant(dot)com> |
|---|---|
| To: | Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp> |
| Cc: | Rajkumar Raghuwanshi <rajkumar(dot)raghuwanshi(at)enterprisedb(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Kyotaro HORIGUCHI <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp>, Jesper Pedersen <jesper(dot)pedersen(at)redhat(dot)com>, Amit Langote <amitlangote09(at)gmail(dot)com>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Beena Emerson <memissemerson(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [HACKERS] path toward faster partition pruning |
| Date: | 2018-02-22 08:41:10 |
| Message-ID: | CAKJS1f9ac41yda7AKzqaME1cYhU2jSi+rs1Ui1iDMP2Jx0h-xQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On 21 February 2018 at 23:44, Amit Langote
<Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp> wrote:
> Please find attached updated patches.
Thanks for updating the code.
The question I have now is around NULL handling in
partkey_datum_from_expr(). I've not managed to find a way to get a
NULL Const in there as it seems all the clauses I try get removed
somewhere earlier in planning. Do you know for a fact that a NULL
Const is impossible to get there?
I'm having to add some NULL handling there for the run-time pruning
patch but wondered if it was also required for your patch.
--
David Rowley http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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