15 8:44 AM
> To: Tom Lane; Kohei KaiGai
> Cc: Robert Haas; Thom Brown; Shigeru Hanada; pgsql-hackers@postgreSQL.org
> Subject: Re: Custom/Foreign-Join-APIs (Re: [HACKERS] [v9.5] Custom Plan API)
>
> > A possible compromise that we could perhaps still wedge into 9.5 is to
> &
2015-05-15 8:43 GMT+09:00 Kouhei Kaigai :
> Regarding of FDW, as Hanada-san mentioned, I'm uncertain whether
> similar feature is also needed because its join-pushdown feature
> scan on the result-set of remotely joined relations, thus no need
> to have local child Path nodes.
> So, I put this cust
> A possible compromise that we could perhaps still wedge into 9.5 is to
> extend CustomPath with a List of child Paths, and CustomScan with a List
> of child Plans, which createplan.c would know to build from the Paths,
> and other modules would then also be aware of these children. I find that
>
2015-05-12 10:24 GMT+09:00 Kouhei Kaigai :
> option-2)
> Tom's suggestion. Add a new list field of Path nodes on CustomPath,
> then create_customscan_plan() will call static create_plan_recurse()
> function to construct child plan nodes.
> Probably, the attached patch will be an image of this enhan
AM
> To: 'Andres Freund'; 'Robert Haas'
> Cc: 'Tom Lane'; 'Kohei KaiGai'; 'Thom Brown'; 'Shigeru Hanada';
> 'pgsql-hackers@postgreSQL.org'
> Subject: RE: Custom/Foreign-Join-APIs (Re: [HACKERS] [v9.5] Custom Plan
12:48 PM
> To: 'Andres Freund'; Robert Haas
> Cc: Tom Lane; Kohei KaiGai; Thom Brown; Shigeru Hanada;
> pgsql-hackers@postgreSQL.org
> Subject: RE: Custom/Foreign-Join-APIs (Re: [HACKERS] [v9.5] Custom Plan API)
>
> > On 2015-05-10 21:26:26 -0400, Robert Haas w
On Sun, May 10, 2015 at 11:07 PM, Andres Freund wrote:
> On 2015-05-10 22:51:33 -0400, Robert Haas wrote:
>> > And there's definitely some things
>> > around that pretty much only still exist because changing them would
>> > break too much stuff.
>>
>> Such as what?
>
> Without even thinking about
> On 2015-05-10 21:26:26 -0400, Robert Haas wrote:
> > On Sun, May 10, 2015 at 8:41 PM, Tom Lane wrote:
> > > > This commit reverts create_plan_recurse() as static function.
> > > Yes. I am not convinced that external callers should be calling that,
> > > and would prefer not to enlarge createpla
On 2015-05-10 22:51:33 -0400, Robert Haas wrote:
> > And there's definitely some things
> > around that pretty much only still exist because changing them would
> > break too much stuff.
>
> Such as what?
Without even thinking about it:
* linitial vs lfirst vs lnext. That thing still induces an i
On Sun, May 10, 2015 at 10:37 PM, Andres Freund wrote:
> On 2015-05-10 21:53:45 -0400, Robert Haas wrote:
>> Please name EVEN ONE instance in which core development has been
>> prevented for fear of changing a function API.
>
> Even *moving* function declarations to a different file has been laudl
On 2015-05-10 21:53:45 -0400, Robert Haas wrote:
> Please name EVEN ONE instance in which core development has been
> prevented for fear of changing a function API.
Even *moving* function declarations to a different file has been laudly
and repeatedly complained about... And there's definitely som
On 2015-05-10 21:26:26 -0400, Robert Haas wrote:
> On Sun, May 10, 2015 at 8:41 PM, Tom Lane wrote:
> > > This commit reverts create_plan_recurse() as static function.
> > Yes. I am not convinced that external callers should be calling that,
> > and would prefer not to enlarge createplan.c's API
On Sun, May 10, 2015 at 9:34 PM, Tom Lane wrote:
> Robert Haas writes:
>> Your unwillingness to make functions global or to stick PGDLLIMPORT
>> markings on variables that people want access to is hugely
>> handicapping extension authors. Many people have complained about
>> that on multiple occ
Robert Haas writes:
> Your unwillingness to make functions global or to stick PGDLLIMPORT
> markings on variables that people want access to is hugely
> handicapping extension authors. Many people have complained about
> that on multiple occasions. Frankly, I find it obstructionist and
> petty.
On Sun, May 10, 2015 at 8:41 PM, Tom Lane wrote:
> Kohei KaiGai writes:
>> I briefly checked your updates.
>> Even though it is not described in the commit-log, I noticed a
>> problematic change.
>
>> This commit reverts create_plan_recurse() as static function.
>
> Yes. I am not convinced that
> Kohei KaiGai writes:
> > I briefly checked your updates.
> > Even though it is not described in the commit-log, I noticed a
> > problematic change.
>
> > This commit reverts create_plan_recurse() as static function.
>
> Yes. I am not convinced that external callers should be calling that,
> a
Kohei KaiGai writes:
> I briefly checked your updates.
> Even though it is not described in the commit-log, I noticed a
> problematic change.
> This commit reverts create_plan_recurse() as static function.
Yes. I am not convinced that external callers should be calling that,
and would prefer no
Tom,
I briefly checked your updates.
Even though it is not described in the commit-log, I noticed a
problematic change.
This commit reverts create_plan_recurse() as static function. It means extension
cannot have child node, even if it wants to add a custom-join logic.
Please assume a simple case
I've committed a cleanup patch along the lines discussed.
One thought is that we could test the nondefault-scan-tuple logic without
a lot of work by modifying the way postgres_fdw deals with columns it
decides don't need to be fetched. Right now it injects NULL columns so
that the remote query re
Robert Haas writes:
> On Sat, May 9, 2015 at 1:05 PM, Tom Lane wrote:
>> For these reasons, I think that if an FDW tried to be laxer than "tables
>> must be on the same pg_foreign_server entry to be joined", the odds
>> approach unity that it would be broken, and probably dangerously broken.
>> S
On Sat, May 9, 2015 at 1:05 PM, Tom Lane wrote:
>> I originally wanted to go quite the other way with this and check for
>> join pushdown via handler X any time at least one of the two relations
>> involved used handler X, even if the other one used some other handler
>> or was a plain table. In
Robert Haas writes:
> On Fri, May 8, 2015 at 5:48 PM, Tom Lane wrote:
>> I think that we'd really be better off insisting on same server (as in
>> same pg_foreign_server OID), hence automatically same FDW, and what's
>> even more important, same user mapping for any possible query execution
>> co
2015-05-09 8:18 GMT+09:00 Kohei KaiGai :
> 2015-05-09 2:46 GMT+09:00 Tom Lane :
>> Kouhei Kaigai writes:
I've been trying to code-review this patch, because the documentation
seemed several bricks shy of a load, and I find myself entirely confused
by the fdw_ps_tlist and custom_ps_t
2015-05-09 8:32 GMT+09:00 Kohei KaiGai :
> 2015-05-09 3:51 GMT+09:00 Tom Lane :
>> Robert Haas writes:
>>> On Fri, May 8, 2015 at 1:46 PM, Tom Lane wrote:
That's nice, but 9.5 feature freeze is only a week away. I don't have a
lot of confidence that this stuff is actually in a state wh
2015-05-09 11:21 GMT+09:00 Robert Haas :
> On Fri, May 8, 2015 at 5:48 PM, Tom Lane wrote:
>> ... btw, I just noticed something that had escaped me because it seems so
>> obviously wrong that I had not even stopped to consider the possibility
>> that the code was doing what it's doing. To wit, th
On Fri, May 8, 2015 at 5:48 PM, Tom Lane wrote:
> ... btw, I just noticed something that had escaped me because it seems so
> obviously wrong that I had not even stopped to consider the possibility
> that the code was doing what it's doing. To wit, that the planner
> supposes that two foreign tab
On Fri, May 8, 2015 at 2:51 PM, Tom Lane wrote:
> Well, we have two alternatives. I can keep hacking on this and get it
> to a state where it seems credible to me, but we won't have any proof
> that it actually works (though perhaps we could treat any problems
> as bugs that should hopefully get
2015-05-09 3:51 GMT+09:00 Tom Lane :
> Robert Haas writes:
>> On Fri, May 8, 2015 at 1:46 PM, Tom Lane wrote:
>>> That's nice, but 9.5 feature freeze is only a week away. I don't have a
>>> lot of confidence that this stuff is actually in a state where we won't
>>> regret shipping it in 9.5.
>
>
2015-05-09 2:46 GMT+09:00 Tom Lane :
> Kouhei Kaigai writes:
>>> I've been trying to code-review this patch, because the documentation
>>> seemed several bricks shy of a load, and I find myself entirely confused
>>> by the fdw_ps_tlist and custom_ps_tlist fields.
>
>> Main-point of your concern is
2015-05-09 6:48 GMT+09:00 Tom Lane :
> ... btw, I just noticed something that had escaped me because it seems so
> obviously wrong that I had not even stopped to consider the possibility
> that the code was doing what it's doing. To wit, that the planner
> supposes that two foreign tables are pote
... btw, I just noticed something that had escaped me because it seems so
obviously wrong that I had not even stopped to consider the possibility
that the code was doing what it's doing. To wit, that the planner
supposes that two foreign tables are potentially remote-joinable if they
share the sam
Robert Haas writes:
> On Fri, May 8, 2015 at 1:46 PM, Tom Lane wrote:
>> That's nice, but 9.5 feature freeze is only a week away. I don't have a
>> lot of confidence that this stuff is actually in a state where we won't
>> regret shipping it in 9.5.
> Yeah. The POC you were asking for upthread
On Fri, May 8, 2015 at 1:46 PM, Tom Lane wrote:
> That's nice, but 9.5 feature freeze is only a week away. I don't have a
> lot of confidence that this stuff is actually in a state where we won't
> regret shipping it in 9.5.
Yeah. The POC you were asking for upthread certainly exists and has
fo
Kouhei Kaigai writes:
>> I've been trying to code-review this patch, because the documentation
>> seemed several bricks shy of a load, and I find myself entirely confused
>> by the fdw_ps_tlist and custom_ps_tlist fields.
> Main-point of your concern is lack of documentation/comments to introduce
> Robert Haas writes:
> > On Thu, Apr 30, 2015 at 5:21 PM, Kouhei Kaigai wrote:
> >> I wanted to submit the v14 after the above items get clarified.
> >> The attached patch (v14) includes all what you suggested in the previous
> >> message.
>
> > Committed, after heavily working over the documen
Robert Haas writes:
> On Thu, Apr 30, 2015 at 5:21 PM, Kouhei Kaigai wrote:
>> I wanted to submit the v14 after the above items get clarified.
>> The attached patch (v14) includes all what you suggested in the previous
>> message.
> Committed, after heavily working over the documentation, and wi
On Thu, Apr 30, 2015 at 5:21 PM, Kouhei Kaigai wrote:
> I wanted to submit the v14 after the above items get clarified.
> The attached patch (v14) includes all what you suggested in the previous
> message.
Committed, after heavily working over the documentation, and with some
more revisions to th
> On Thu, Apr 30, 2015 at 9:16 AM, Kouhei Kaigai wrote:
> > It seems to me the code block for T_ForeignScan and T_CustomScan in
> > setrefs.c are a bit large. It may be better to have a separate
> > function like T_IndexOnlyScan.
> > How about your opinion?
>
> Either way is OK with me. Please d
On Thu, Apr 30, 2015 at 9:16 AM, Kouhei Kaigai wrote:
> It seems to me the code block for T_ForeignScan and T_CustomScan in
> setrefs.c are a bit large. It may be better to have a separate
> function like T_IndexOnlyScan.
> How about your opinion?
Either way is OK with me. Please do as you think
> On Sun, Apr 26, 2015 at 10:00 PM, Kouhei Kaigai wrote:
> > The attached patch v13 is revised one according to the suggestion
> > by Robert.
>
> Thanks.
>
> The last hunk in foreign.c is a useless whitespace change.
>
Sorry, my oversight.
> + /* actually, not shift members */
>
> Change
On Sun, Apr 26, 2015 at 10:00 PM, Kouhei Kaigai wrote:
> The attached patch v13 is revised one according to the suggestion
> by Robert.
Thanks.
The last hunk in foreign.c is a useless whitespace change.
+ /* actually, not shift members */
Change to: "shift of 0 is the same as copying"
B
On Mon, Apr 27, 2015 at 5:05 AM, Shigeru HANADA
wrote:
> Currently INNER JOINs with unsafe join conditions are not pushed down, so
> such test is not in the suit. As you say, in theory, INNER JOINs can be
> pushed down even they have push-down-unsafe join conditions, because such
> conditions
On Fri, Apr 24, 2015 at 3:08 PM, Shigeru HANADA
wrote:
> Hi Ashutosh,
>
> Thanks for the review.
>
> 2015/04/22 19:28、Ashutosh Bapat のメール：
> > Tests
> > ---
> > 1.The postgres_fdw test is re/setting enable_mergejoin at various
> places. The goal of these tests seems to be to test the sanity
Hi Ashutosh,
Thanks for the review.
2015/04/22 19:28、Ashutosh Bapat のメール：
> Tests
> ---
> 1.The postgres_fdw test is re/setting enable_mergejoin at various places. The
> goal of these tests seems to be to test the sanity of foreign plans
> generated. So, it might be better to reset enable_
015 11:23 PM
> To: 'Robert Haas'
> Cc: Tom Lane; Thom Brown; Shigeru Hanada; pgsql-hackers@postgreSQL.org
> Subject: Re: Custom/Foreign-Join-APIs (Re: [HACKERS] [v9.5] Custom Plan API)
>
> > On Wed, Apr 22, 2015 at 10:48 PM, Kouhei Kaigai
> >
> On Wed, Apr 22, 2015 at 10:48 PM, Kouhei Kaigai wrote:
> >> + else if (scan->scanrelid == 0 &&
> >> +(IsA(scan, ForeignScan) || IsA(scan, CustomScan)))
> >> + varno = INDEX_VAR;
> >>
> >> Suppose scan->scanrelid == 0 but the scan type is something else
On Wed, Apr 22, 2015 at 10:48 PM, Kouhei Kaigai wrote:
>> + else if (scan->scanrelid == 0 &&
>> +(IsA(scan, ForeignScan) || IsA(scan, CustomScan)))
>> + varno = INDEX_VAR;
>>
>> Suppose scan->scanrelid == 0 but the scan type is something else? Is
>> tha
Hi Ashutosh,
Thanks for the review.
2015/04/22 19:28、Ashutosh Bapat のメール：
> Tests
> ---
> 1.The postgres_fdw test is re/setting enable_mergejoin at various places. The
> goal of these tests seems to be to test the sanity of foreign plans
> generated. So, it might be better to reset enable_
Hi Robert,
Thanks for your comments.
> A few random cosmetic problems:
>
> - The hunk in allpaths.c is useless.
> - The first hunk in fdwapi.h contains an extra space before the
> closing parenthesis.
>
OK, it's my oversight.
> And then:
>
> + else if (scan->scanrelid == 0 &&
> +
On Fri, Mar 13, 2015 at 8:02 PM, Tom Lane wrote:
> Robert Haas writes:
>> On Fri, Mar 13, 2015 at 2:31 PM, Tom Lane wrote:
>>> I don't object to the concept, but I think that is a pretty bad place
>>> to put the hook call: add_paths_to_joinrel is typically called multiple
>>> (perhaps *many*) ti
On Tue, Apr 21, 2015 at 10:33 PM, Kouhei Kaigai wrote:
> [ new patch ]
A little more nitpicking:
ExecInitForeignScan() and ExecInitCustomScan() could declare
currentRelation inside the if (scanrelid > 0) block instead of in the
outer scope.
I'm not too excited about the addition of GetFdwHandle
On Wed, Mar 25, 2015 at 9:51 PM, Kouhei Kaigai wrote:
> The attached patch adds GetForeignJoinPaths call on make_join_rel() only when
> 'joinrel' is actually built and both of child relations are managed by same
> FDW driver, prior to any other built-in join paths.
> I adjusted the hook definition
Hanada-san,
> I reviewed the Custom/Foreign join API patch again after writing a patch of
> join
> push-down support for postgres_fdw.
>
Thanks for your dedicated jobs, my comments are inline below.
> Here, please let me summarize the changes in the patch as the result of my
> review.
>
> * Ad
Kaigai-san,
I reviewed the Custom/Foreign join API patch again after writing a patch of
join push-down support for postgres_fdw.
2015/03/26 10:51、Kouhei Kaigai のメール：
>>> Or bottom of make_join_rel(). IMO build_join_rel() is responsible for just
>> building (or searching from a list) a RelOptI
HANADA [mailto:shigeru.han...@gmail.com]
> Sent: Friday, April 17, 2015 1:44 PM
> To: Kaigai Kouhei(海外 浩平)
> Cc: Ashutosh Bapat; Robert Haas; Tom Lane; Thom Brown;
> pgsql-hackers@postgreSQL.org
> Subject: ##freemail## Re: Custom/Foreign-Join-APIs (Re: [HACKERS] [v9.5]
> Custom
>
KaiGai Kohei
> -Original Message-
> From: Shigeru HANADA [mailto:shigeru.han...@gmail.com]
> Sent: Thursday, April 16, 2015 5:06 PM
> To: Kaigai Kouhei(海外 浩平)
> Cc: Ashutosh Bapat; Robert Haas; Tom Lane; Thom Brown;
> pgsql-hackers@postgreSQL.org
> Subject: ##freemail##
on why to split this feature.
Thanks,
--
NEC Business Creation Division / PG-Strom Project
KaiGai Kohei
> -Original Message-
> From: pgsql-hackers-ow...@postgresql.org
> [mailto:pgsql-hackers-ow...@postgresql.org] On Behalf Of Shigeru HANADA
> Sent: Tuesday, April 14, 2015 7:
KaiGai-san,
2015/04/14 14:04、Kouhei Kaigai のメール：
>
>> * Fix typos
>>
>> Please review the v11 patch, and mark it as “ready for committer” if it’s ok.
>>
> It's OK for me, and wants to be reviewed by other people to get it committed.
>
Thanks!
>> In addition to essential features, I tried to
Hanada-san,
> Thanks for further review, but I found two bugs in v10 patch.
> I’ve fixed them and wrapped up v11 patch here.
>
> * Fix bug about illegal column order
>
> Scan against a base relation returns columns in order of column definition,
> but
> its target list might require different o
> 2015/04/09 10:48、Kouhei Kaigai のメール：
> * merge_fpinfo()
> >>> It seems to me fpinfo->rows should be joinrel->rows, and
> >>> fpinfo->width also should be joinrel->width.
> >>> No need to have special intelligence here, isn't it?
> >>
> >>
> >> Oops. They are vestige of my struggle which disabled
Hanada-san,
> In addition to your comments, I removed useless code that retrieves
> ForeignPath
> from outer/inner RelOptInfo and store them into ForeignPath#fdw_private. Now
> postgres_fdw’s join pushd-down is free from existence of ForeignPath under the
> join relation. This means that we can
t; -Original Message-
> From: pgsql-hackers-ow...@postgresql.org
> [mailto:pgsql-hackers-ow...@postgresql.org] On Behalf Of Shigeru Hanada
> Sent: Friday, April 03, 2015 7:32 PM
> To: Kaigai Kouhei(海外 浩平)
> Cc: Ashutosh Bapat; Robert Haas; Tom Lane; Thom Brown;
>
2015/03/26 10:51、Kouhei Kaigai のメール：
> The attached patch adds GetForeignJoinPaths call on make_join_rel() only when
> 'joinrel' is actually built and both of child relations are managed by same
> FDW driver, prior to any other built-in join paths.
> I adjusted the hook definition a little bit, b
> > Or bottom of make_join_rel(). IMO build_join_rel() is responsible for just
> building (or searching from a list) a RelOptInfo for given relids. After that
> make_join_rel() calls add_paths_to_joinrel() with appropriate arguments per
> join
> type to generate actual Paths implements the join.
> 2015/03/25 19:47、Kouhei Kaigai のメール：
> > The reason why FDW handler was called multiple times on your example is,
> > your modified make_join_rel() does not check whether build_join_rel()
> > actually build a new RelOptInfo, or just a cache reference, doesn't it?
> >
>
> Yep. After that change
2015/03/25 19:47、Kouhei Kaigai のメール：
> The reason why FDW handler was called multiple times on your example is,
> your modified make_join_rel() does not check whether build_join_rel()
> actually build a new RelOptInfo, or just a cache reference, doesn't it?
>
Yep. After that change calling cou
2015/03/25 18:53、Ashutosh Bapat のメール：
>
>
> On Wed, Mar 25, 2015 at 3:14 PM, Shigeru HANADA
> wrote:
>
> Or bottom of make_join_rel(). IMO build_join_rel() is responsible for just
> building (or searching from a list) a RelOptInfo for given relids. After
> that make_join_rel() calls add
> 2015/03/25 19:09、Kouhei Kaigai のメール：
>
> >> On Wed, Mar 25, 2015 at 3:14 PM, Shigeru HANADA
> wrote:
> >>Or bottom of make_join_rel(). IMO build_join_rel() is responsible for
> >> just building (or searching from a list) a RelOptInfo for given relids.
> >> After
> >> that make_join_rel(
> 2015/03/25 12:59、Kouhei Kaigai のメール：
>
> >>> At this moment, I'm not 100% certain about its logic. Especially, I didn't
> >>> test SEMI- and ANTI- join cases yet.
> >>> However, time is money - I want people to check overall design first,
> >>> rather
> >>> than detailed debugging. Please tell
2015/03/25 19:09、Kouhei Kaigai のメール：
>> On Wed, Mar 25, 2015 at 3:14 PM, Shigeru HANADA
>> wrote:
>> Or bottom of make_join_rel(). IMO build_join_rel() is responsible for
>> just building (or searching from a list) a RelOptInfo for given relids.
>> After
>> that make_join_rel() calls a
> On Wed, Mar 25, 2015 at 3:14 PM, Shigeru HANADA
> wrote:
> Or bottom of make_join_rel(). IMO build_join_rel() is responsible for
> just building (or searching from a list) a RelOptInfo for given relids. After
> that make_join_rel() calls add_paths_to_joinrel() with appropriate arguments
On Wed, Mar 25, 2015 at 3:14 PM, Shigeru HANADA
wrote:
>
> Or bottom of make_join_rel(). IMO build_join_rel() is responsible for
> just building (or searching from a list) a RelOptInfo for given relids.
> After that make_join_rel() calls add_paths_to_joinrel() with appropriate
> arguments per jo
2015/03/25 12:59、Kouhei Kaigai のメール：
>>> At this moment, I'm not 100% certain about its logic. Especially, I didn't
>>> test SEMI- and ANTI- join cases yet.
>>> However, time is money - I want people to check overall design first, rather
>>> than detailed debugging. Please tell me if I misunders
eru.han...@gmail.com]
> Sent: Tuesday, March 24, 2015 7:36 PM
> To: Kaigai Kouhei(海外 浩平)
> Cc: Robert Haas; Tom Lane; Ashutosh Bapat; Thom Brown;
> pgsql-hackers@postgreSQL.org
> Subject: Re: Custom/Foreign-Join-APIs (Re: [HACKERS] [v9.5] Custom Plan API)
>
> 2015/03/23
2015/03/23 9:12、Kouhei Kaigai のメール：
> Sorry for my response late. It was not easy to code during business trip.
>
> The attached patch adds a hook for FDW/CSP to replace entire join-subtree
> by a foreign/custom-scan, according to the discussion upthread.
>
> GetForeignJoinPaths handler of FDW
> On Wed, Mar 18, 2015 at 9:33 AM, Kouhei Kaigai wrote:
> >> On Wed, Mar 18, 2015 at 2:34 AM, Kouhei Kaigai
> >> wrote:
> >> > So, overall consensus for the FDW hook location is just before the
> >> > set_chepest()
> >> > at standard_join_search() and merge_clump(), isn't it?
> >>
> >> Yes, I t
On Wed, Mar 18, 2015 at 9:33 AM, Kouhei Kaigai wrote:
>> On Wed, Mar 18, 2015 at 2:34 AM, Kouhei Kaigai wrote:
>> > So, overall consensus for the FDW hook location is just before the
>> > set_chepest()
>> > at standard_join_search() and merge_clump(), isn't it?
>>
>> Yes, I think so.
>>
>> > Let
> On Wed, Mar 18, 2015 at 2:34 AM, Kouhei Kaigai wrote:
> > So, overall consensus for the FDW hook location is just before the
> > set_chepest()
> > at standard_join_search() and merge_clump(), isn't it?
>
> Yes, I think so.
>
> > Let me make a design of FDW hook to reduce code duplications for
On Wed, Mar 18, 2015 at 2:34 AM, Kouhei Kaigai wrote:
> So, overall consensus for the FDW hook location is just before the
> set_chepest()
> at standard_join_search() and merge_clump(), isn't it?
Yes, I think so.
> Let me make a design of FDW hook to reduce code duplications for each FDW
> dri
> Robert Haas writes:
> > On Tue, Mar 17, 2015 at 10:11 AM, Kouhei Kaigai
> > wrote:
> >> It might be an idea if foreign-scan path is not wiped out regardless of the
> >> estimated cost, we will be able to construct an entirely remote-join path
> >> even if intermediation path is expensive than
Robert Haas writes:
> On Tue, Mar 17, 2015 at 10:11 AM, Kouhei Kaigai wrote:
>> It might be an idea if foreign-scan path is not wiped out regardless of the
>> estimated cost, we will be able to construct an entirely remote-join path
>> even if intermediation path is expensive than local join.
>>
On Tue, Mar 17, 2015 at 8:34 PM, Robert Haas wrote:
> On Tue, Mar 17, 2015 at 10:11 AM, Kouhei Kaigai
> wrote:
> >> A way to work around this is to leave the ForeignPaths (there can
> possibly be
> >> only one foreign path per join relation) in the joinrel without
> removing them.
> >> FDW shoul
On Tue, Mar 17, 2015 at 10:11 AM, Kouhei Kaigai wrote:
>> A way to work around this is to leave the ForeignPaths (there can possibly be
>> only one foreign path per join relation) in the joinrel without removing
>> them.
>> FDW should work on joining two relations if they have foreign paths in th
> On Sat, Mar 14, 2015 at 3:48 AM, Robert Haas wrote:
>
>
> On Fri, Mar 13, 2015 at 2:31 PM, Tom Lane wrote:
> > Robert Haas writes:
> >> Another bit of this that I think we could commit without fretting
> >> about it too much is the code adding set_join_pathlist_hook.
On Tue, Mar 17, 2015 at 10:28 AM, Shigeru Hanada
wrote:
> 2015-03-14 7:18 GMT+09:00 Robert Haas :
> > I think the foreign data wrapper join pushdown case, which also aims
> > to substitute a scan for a join, is interesting to think about, even
> > though it's likely to be handled by a new FDW met
On Sat, Mar 14, 2015 at 3:48 AM, Robert Haas wrote:
> On Fri, Mar 13, 2015 at 2:31 PM, Tom Lane wrote:
> > Robert Haas writes:
> >> Another bit of this that I think we could commit without fretting
> >> about it too much is the code adding set_join_pathlist_hook. This is
> >> - I think - analo
On 2015/03/14 7:18, Robert Haas wrote:
I think the foreign data wrapper join pushdown case, which also aims
to substitute a scan for a join, is interesting to think about, even
though it's likely to be handled by a new FDW method instead of via
the hook. Where should the FDW method get called fr
> -Original Message-
> From: Shigeru Hanada [mailto:shigeru.han...@gmail.com]
> Sent: Monday, March 16, 2015 9:59 PM
> To: Robert Haas
> Cc: Tom Lane; Thom Brown; Kaigai Kouhei(海外 浩平); pgsql-hackers@postgreSQL.org
> Subject: ##freemail## Re: Custom/Foreign-Join-APIs (R
2015-03-14 7:18 GMT+09:00 Robert Haas :
> I think the foreign data wrapper join pushdown case, which also aims
> to substitute a scan for a join, is interesting to think about, even
> though it's likely to be handled by a new FDW method instead of via
> the hook. Where should the FDW method get ca
On Sat, Mar 14, 2015 at 10:37 PM, Kouhei Kaigai wrote:
> From the standpoint of extension development, I'm uncertain whether we
> can easily reproduce information needed to compute alternative paths on
> the hook at standard_join_search(), like a hook at add_paths_to_joinrel().
>
> (Please correct
age-
> From: pgsql-hackers-ow...@postgresql.org
> [mailto:pgsql-hackers-ow...@postgresql.org] On Behalf Of Kouhei Kaigai
> Sent: Sunday, March 15, 2015 11:38 AM
> To: Robert Haas; Tom Lane
> Cc: Thom Brown; Shigeru Hanada; pgsql-hackers@postgreSQL.org
> Subject: Re: Custom/Foreign-Jo
> On Fri, Mar 13, 2015 at 2:31 PM, Tom Lane wrote:
> > Robert Haas writes:
> >> Another bit of this that I think we could commit without fretting
> >> about it too much is the code adding set_join_pathlist_hook. This is
> >> - I think - analogous to set_rel_pathlist_hook, and like that hook,
> >
Robert Haas writes:
> On Fri, Mar 13, 2015 at 2:31 PM, Tom Lane wrote:
>> I don't object to the concept, but I think that is a pretty bad place
>> to put the hook call: add_paths_to_joinrel is typically called multiple
>> (perhaps *many*) times per joinrel and thus this placement would force
>> a
On Fri, Mar 13, 2015 at 2:31 PM, Tom Lane wrote:
> Robert Haas writes:
>> Another bit of this that I think we could commit without fretting
>> about it too much is the code adding set_join_pathlist_hook. This is
>> - I think - analogous to set_rel_pathlist_hook, and like that hook,
>> could be u
Robert Haas writes:
> Another bit of this that I think we could commit without fretting
> about it too much is the code adding set_join_pathlist_hook. This is
> - I think - analogous to set_rel_pathlist_hook, and like that hook,
> could be used for other purposes than custom plan generation - e.g
On Thu, Mar 12, 2015 at 8:09 PM, Thom Brown wrote:
> On 12 March 2015 at 21:28, Tom Lane wrote:
>> Robert Haas writes:
>>> I took a look at this patch today and noticed that it incorporates not
>>> only documentation for the new functionality it adds, but also for the
>>> custom-scan functionali
> On Mon, Mar 9, 2015 at 11:18 PM, Kouhei Kaigai wrote:
> > The attached patch integrates a suggestion from Ashutosh Bapat.
> > It allows to track set of relations involved in a join, but
> > replaced by foreign-/custom-scan. It enables to make correct
> > EXPLAIN output, if FDW/CSP driver makes h
On 12 March 2015 at 21:28, Tom Lane wrote:
> Robert Haas writes:
>> I took a look at this patch today and noticed that it incorporates not
>> only documentation for the new functionality it adds, but also for the
>> custom-scan functionality whose documentation I previously excluded
>> from commi
Robert Haas writes:
> I took a look at this patch today and noticed that it incorporates not
> only documentation for the new functionality it adds, but also for the
> custom-scan functionality whose documentation I previously excluded
> from commit on the grounds that it needed more work, especia
On Mon, Mar 9, 2015 at 11:18 PM, Kouhei Kaigai wrote:
> The attached patch integrates a suggestion from Ashutosh Bapat.
> It allows to track set of relations involved in a join, but
> replaced by foreign-/custom-scan. It enables to make correct
> EXPLAIN output, if FDW/CSP driver makes human reada
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