On Fri, Nov 14, 2014 at 02:51:32PM +1300, David Rowley wrote:
Likely for most aggregates, like count, sum, max, min, bit_and and bit_or the
merge function would be the same as the transition function, as the state type
is just the same as the input type. It would only be aggregates like avg(),
On Fri, Nov 14, 2014 at 02:51:32PM +1300, David Rowley wrote:
Likely for most aggregates, like count, sum, max, min, bit_and and
bit_or the merge function would be the same as the transition
function, as the state type is just the same as the input type. It
would only be aggregates like
On Wed, Dec 3, 2014 at 3:23 PM, Kouhei Kaigai kai...@ak.jp.nec.com wrote:
On Fri, Nov 14, 2014 at 02:51:32PM +1300, David Rowley wrote:
Likely for most aggregates, like count, sum, max, min, bit_and and
bit_or the merge function would be the same as the transition
function, as the state
On Thu, Nov 13, 2014 at 7:27 PM, Simon Riggs si...@2ndquadrant.com wrote:
On 12 November 2014 00:54, Robert Haas robertmh...@gmail.com wrote:
On Tue, Nov 11, 2014 at 3:29 AM, Simon Riggs si...@2ndquadrant.com wrote:
* only functions marked as CONTAINS NO SQL
We don't really know what
On 14 November 2014 11:02, Kouhei Kaigai kai...@ak.jp.nec.com wrote:
I'd like to throw community folks a question.
Did someone have a discussion to the challenge of aggregate push-down across
relations join in the past? It potentially reduces number of rows to be
joined.
If we already had,
On 17 November 2014 16:01, Robert Haas robertmh...@gmail.com wrote:
I still don't know what CONTAINS NO SQL means.
It's a function marking that would indicate we aren't allowed to take
snapshots or run SQL.
I think you should publish the scheme for marking functions as safe
for parallelism, so
On 18 November 2014 05:19, Simon Riggs si...@2ndquadrant.com wrote:
On 14 November 2014 11:02, Kouhei Kaigai kai...@ak.jp.nec.com wrote:
I'd like to throw community folks a question.
Did someone have a discussion to the challenge of aggregate push-down
across
relations join in the past?
On 18 November 2014 05:19, Simon Riggs si...@2ndquadrant.com wrote:
On 14 November 2014 11:02, Kouhei Kaigai kai...@ak.jp.nec.com
wrote:
I'd like to throw community folks a question.
Did someone have a discussion to the challenge of aggregate
push-down across
On 14 November 2014 20:37, Jim Nasby jim.na...@bluetreble.com wrote:
On 11/12/14, 1:54 AM, David Rowley wrote:
We'd also need to add some infrastructure to merge aggregate states
together for this to work properly. This means that could also work for
avg() and stddev etc. For max() and
On 14 November 2014 07:37, Jim Nasby jim.na...@bluetreble.com wrote:
On 11/12/14, 1:54 AM, David Rowley wrote:
On Tue, Nov 11, 2014 at 9:29 PM, Simon Riggs si...@2ndquadrant.com
mailto:si...@2ndquadrant.com wrote:
This plan type is widely used in reporting queries, so will hit the
On 14 November 2014 01:51, David Rowley dgrowle...@gmail.com wrote:
When I mentioned this, I didn't mean to appear to be placing a road block.I
was just bringing to the table the information that COUNT(*) + COUNT(*)
works ok for merging COUNT(*)'s sub totals, but AVG(n) + AVG(n) does not.
On 14 November 2014 07:37, Jim Nasby jim.na...@bluetreble.com wrote:
On 11/12/14, 1:54 AM, David Rowley wrote:
On Tue, Nov 11, 2014 at 9:29 PM, Simon Riggs si...@2ndquadrant.com
mailto:si...@2ndquadrant.com wrote:
This plan type is widely used in reporting queries, so will hit
On Fri, Nov 14, 2014 at 1:27 PM, Simon Riggs si...@2ndquadrant.com wrote:
On 12 November 2014 00:54, Robert Haas robertmh...@gmail.com wrote:
Interestingly, I have a fairly solid idea of what proisparallel is,
but I have no clear idea what CONTAINS NO SQL is or why it's relevant.
I would
On 12 November 2014 00:54, Robert Haas robertmh...@gmail.com wrote:
I'm going to aim for the simpler:
Hash Aggregate
- Parallel Seq Scan
Workers: 4
Yeah, I know that won't perform as well as what you're proposing, but
I'm fairly sure it's simpler.
Simple is best, so +1.
--
Simon
On 12 November 2014 07:54, David Rowley dgrowle...@gmail.com wrote:
On Tue, Nov 11, 2014 at 9:29 PM, Simon Riggs si...@2ndquadrant.com wrote:
This plan type is widely used in reporting queries, so will hit the
mainline of BI applications and many Mat View creations.
This will allow SELECT
On 12 November 2014 00:54, Robert Haas robertmh...@gmail.com wrote:
On Tue, Nov 11, 2014 at 3:29 AM, Simon Riggs si...@2ndquadrant.com wrote:
* only functions marked as CONTAINS NO SQL
We don't really know what proisparallel is, but we do know what
CONTAINS NO SQL means and can easily check
On Fri, Nov 14, 2014 at 1:19 PM, Simon Riggs si...@2ndquadrant.com wrote:
On 12 November 2014 07:54, David Rowley dgrowle...@gmail.com wrote:
On Tue, Nov 11, 2014 at 9:29 PM, Simon Riggs si...@2ndquadrant.com
wrote:
This plan type is widely used in reporting queries, so will hit the
On 12 November 2014 07:54, David Rowley dgrowle...@gmail.com
wrote:
On Tue, Nov 11, 2014 at 9:29 PM, Simon Riggs
si...@2ndquadrant.com wrote:
This plan type is widely used in reporting queries, so will hit
the
mainline of BI applications and many
On Fri, Nov 14, 2014 at 2:12 PM, Kouhei Kaigai kai...@ak.jp.nec.com wrote:
On 12 November 2014 07:54, David Rowley
dgrowle...@gmail.com
Take int4_avg_accum() for example it does:
transdata-count++;
transdata-sum += newval;
On 11/12/14, 1:54 AM, David Rowley wrote:
On Tue, Nov 11, 2014 at 9:29 PM, Simon Riggs si...@2ndquadrant.com
mailto:si...@2ndquadrant.com wrote:
This plan type is widely used in reporting queries, so will hit the
mainline of BI applications and many Mat View creations.
This will
On Wed, Nov 12, 2014 at 1:24 PM, David Rowley dgrowle...@gmail.com wrote:
On Tue, Nov 11, 2014 at 9:29 PM, Simon Riggs si...@2ndquadrant.com
wrote:
This plan type is widely used in reporting queries, so will hit the
mainline of BI applications and many Mat View creations.
This will allow
On Tue, Nov 11, 2014 at 7:48 PM, Kouhei Kaigai kai...@ak.jp.nec.com wrote:
Isn't provolatile = PROVOLATILE_IMMUTABLE sufficient?
There are certainly things that are parallel-safe that are not
immutable. It might be the case that everything immutable is
parallel-safe.
--
Robert Haas
On Wed, Nov 12, 2014 at 9:49 PM, Robert Haas robertmh...@gmail.com wrote:
On Tue, Nov 11, 2014 at 7:48 PM, Kouhei Kaigai kai...@ak.jp.nec.com wrote:
Isn't provolatile = PROVOLATILE_IMMUTABLE sufficient?
There are certainly things that are parallel-safe that are not
immutable. It might be the
On 10 November 2014 15:57, Robert Haas robertmh...@gmail.com wrote:
On Wed, Oct 15, 2014 at 2:55 PM, Simon Riggs si...@2ndquadrant.com wrote:
Something usable, with severe restrictions, is actually better than we
have now. I understand the journey this work represents, so don't be
embarrassed
Given
where we are with the infrastructure, there would be a number of
unhandled problems, such as deadlock detection (needs group locking or
similar), assessment of quals as to parallel-safety (needs
proisparallel or similar), general waterproofing to make sure that
pushing down a
On Tue, Nov 11, 2014 at 3:29 AM, Simon Riggs si...@2ndquadrant.com wrote:
* only functions marked as CONTAINS NO SQL
We don't really know what proisparallel is, but we do know what
CONTAINS NO SQL means and can easily check for it.
Plus I already have a patch for this, slightly bitrotted.
On Tue, Nov 11, 2014 at 9:29 PM, Simon Riggs si...@2ndquadrant.com wrote:
This plan type is widely used in reporting queries, so will hit the
mainline of BI applications and many Mat View creations.
This will allow SELECT count(*) FROM foo to go faster also.
We'd also need to add some
Hi Robert, All,
On 2014-11-10 10:57:16 -0500, Robert Haas wrote:
On Wed, Oct 15, 2014 at 2:55 PM, Simon Riggs si...@2ndquadrant.com wrote:
Something usable, with severe restrictions, is actually better than we
have now. I understand the journey this work represents, so don't be
embarrassed
On Tue, Nov 11, 2014 at 10:21 AM, Andres Freund and...@2ndquadrant.com wrote:
On 2014-11-10 10:57:16 -0500, Robert Haas wrote:
Does parallelism help at all?
I'm pretty damn sure. We can't even make a mildly powerfull storage
fully busy right now. Heck, I can't make my workstation's storage
On Tue, Nov 11, 2014 at 5:30 AM, Haribabu Kommi kommi.harib...@gmail.com
wrote:
On Tue, Nov 11, 2014 at 10:21 AM, Andres Freund and...@2ndquadrant.com
wrote:
On 2014-11-10 10:57:16 -0500, Robert Haas wrote:
Does parallelism help at all?
I'm pretty damn sure. We can't even make a mildly
On Tue, Nov 11, 2014 at 2:35 PM, Amit Kapila amit.kapil...@gmail.com wrote:
On Tue, Nov 11, 2014 at 5:30 AM, Haribabu Kommi kommi.harib...@gmail.com
wrote:
On Tue, Nov 11, 2014 at 10:21 AM, Andres Freund and...@2ndquadrant.com
wrote:
On 2014-11-10 10:57:16 -0500, Robert Haas wrote:
Does
On Tue, Nov 11, 2014 at 9:42 AM, Haribabu Kommi kommi.harib...@gmail.com
wrote:
On Tue, Nov 11, 2014 at 2:35 PM, Amit Kapila amit.kapil...@gmail.com
wrote:
On Tue, Nov 11, 2014 at 5:30 AM, Haribabu Kommi
kommi.harib...@gmail.com
wrote:
On Tue, Nov 11, 2014 at 10:21 AM, Andres Freund
Subject: Re: [HACKERS] using custom scan nodes to prototype parallel
sequential scan
On Tue, Nov 11, 2014 at 2:35 PM, Amit Kapila amit.kapil...@gmail.com
wrote:
On Tue, Nov 11, 2014 at 5:30 AM, Haribabu Kommi
kommi.harib...@gmail.com
wrote:
On Tue, Nov 11, 2014 at 10:21 AM, Andres Freund
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