| From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Kevin Grittner <kgrittn(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 18:54:31 |
| Message-ID: | 20160615185431.GA21451@alvherre.pgsql |
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| Lists: | pgsql-committers pgsql-hackers |
Robert Haas wrote:
> On Wed, Jun 15, 2016 at 2:45 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.
>
> The expression index case is the one to worry about; if there is a
> problem, that's where it is. What bothers me is that a function used
> in an expression index could do anything at all - it can read any
> table in the database.
Hmm, but if it does that, then the code that actually implements that
query would run the STO checks, right? The analyze code doesn't need
to.
--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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