| From: | Kevin Grittner <kgrittn(at)gmail(dot)com> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Ants Aasma <ants(dot)aasma(at)eesti(dot)ee>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Noah Misch <noah(at)leadboat(dot)com>, Kevin Grittner <kgrittn(at)postgresql(dot)org>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>, "pgsql-committers(at)postgresql(dot)org" <pgsql-committers(at)postgresql(dot)org> |
| Subject: | Re: [HACKERS] Re: pgsql: Avoid extra locks in GetSnapshotData if old_snapshot_threshold < |
| Date: | 2016-06-15 18:50:18 |
| Message-ID: | CACjxUsPeotFyOAaA84K0dexPJ3ucex-qBANd-0xoxUrzw+u+sQ@mail.gmail.com |
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| Lists: | pgsql-committers pgsql-hackers |
On Wed, Jun 15, 2016 at 1:45 PM, Alvaro Herrera
<alvherre(at)2ndquadrant(dot)com> wrote:
> Maybe it is possible to get into trouble if you're taking a sample for
> an expression index.
Maybe -- if you are using a function for an index expression which
does an explicit SELECT against some database table rather than
only using values from the row itself. In such a case you would
have had to mark a function as IMMUTABLE which depends on table
contents. I say you get to keep both pieces.
--
Kevin Grittner
EDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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