| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Haribabu Kommi <kommi(dot)haribabu(at)gmail(dot)com> |
| Cc: | David Rowley <david(dot)rowley(at)2ndquadrant(dot)com>, Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Kouhei Kaigai <kaigai(at)ak(dot)jp(dot)nec(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Amit Kapila <amit(dot)kapila(at)enterprisedb(dot)com> |
| Subject: | Re: Combining Aggregates |
| Date: | 2016-01-21 17:56:57 |
| Message-ID: | CA+TgmoaBeSoUf7i4fegRruF-CazAatqFV0E1QgLjEqEUGeWDiw@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, Jan 20, 2016 at 9:33 PM, Haribabu Kommi
<kommi(dot)haribabu(at)gmail(dot)com> wrote:
> Here I attached updated patch of parallel aggregate based on the latest
> changes in master. Still it lack of cost comparison of normal aggregate to
> parallel aggregate because of difficulty. This cost comparison is required
> in parallel aggregate as this is having some regression when the number
> of groups are less in the query plan.
Please keep this on its own thread rather than colonizing this one.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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