On 11/01/2018 02:40 AM, David Rowley wrote:
On 1 November 2018 at 12:24, Andres Freund wrote:
FWIW, I kind of wonder if we built proper infrastructure to allow to
make such inferrences from function calls, whether it could also be made
to support the transformation of LIKEs into indexable <=
On 1 November 2018 at 12:24, Andres Freund wrote:
> FWIW, I kind of wonder if we built proper infrastructure to allow to
> make such inferrences from function calls, whether it could also be made
> to support the transformation of LIKEs into indexable <= >= clauses.
Perhaps, but I doubt it would
Hi,
On 2018-11-01 12:19:32 +1300, David Rowley wrote:
> On 1 November 2018 at 12:11, Tomas Vondra
> wrote:
> > I still have trouble imagining what exactly would the function do to
> > determine if the optimization can be applied to substr() and similar
> > collation-dependent cases.
>
> I
On 1 November 2018 at 12:11, Tomas Vondra wrote:
> I still have trouble imagining what exactly would the function do to
> determine if the optimization can be applied to substr() and similar
> collation-dependent cases.
I guess the function would have to check for a Const offset of 0, and
a
On 10/31/2018 10:07 PM, David Rowley wrote:
> On 1 November 2018 at 05:40, Robert Haas wrote:
>> This kinda reminds me of commit
>> 8f9fe6edce358f7904e0db119416b4d1080a83aa. We needed a way to provide
>> the planner with knowledge about the behavior of specific functions.
>> In that case, the
> On Oct 30, 2018, at 9:08 AM, Simon Riggs wrote:
>
> On Tue, 30 Oct 2018 at 07:58, David Rowley
> wrote:
>
> I've started working on something I've ended up calling "Super
> PathKeys". The idea here is to increase the likelihood of a Path with
> PathKeys being used for a purpose that
On 1 November 2018 at 05:40, Robert Haas wrote:
> This kinda reminds me of commit
> 8f9fe6edce358f7904e0db119416b4d1080a83aa. We needed a way to provide
> the planner with knowledge about the behavior of specific functions.
> In that case, the specific need was to be able to tell the planner
>
Robert Haas writes:
> This kinda reminds me of commit
> 8f9fe6edce358f7904e0db119416b4d1080a83aa. We needed a way to provide
> the planner with knowledge about the behavior of specific functions.
> In that case, the specific need was to be able to tell the planner
> that a certain function call
On 10/31/2018 04:32 AM, David Rowley wrote:
On 31 October 2018 at 14:23, Tomas Vondra wrote:
The other thing likely affecting this is locale / collation. Probably
not for date_trunc, but certainly for things like substr()/trim(),
mentioned by Simon upthread.
In some languages the rules are
On 31 October 2018 at 14:23, Tomas Vondra wrote:
> The other thing likely affecting this is locale / collation. Probably
> not for date_trunc, but certainly for things like substr()/trim(),
> mentioned by Simon upthread.
>
> In some languages the rules are pretty complex, and there's no chance
>
Hi,
On 10/30/2018 11:41 PM, David Rowley wrote:
> On 31 October 2018 at 08:52, Tom Lane wrote:
>> David Rowley writes:
>>> I've started working on something I've ended up calling "Super
>>> PathKeys". The idea here is to increase the likelihood of a Path with
>>> PathKeys being used for a
On 31 October 2018 at 08:52, Tom Lane wrote:
> David Rowley writes:
>> I've started working on something I've ended up calling "Super
>> PathKeys". The idea here is to increase the likelihood of a Path with
>> PathKeys being used for a purpose that requires a less strict sort
>> order due to
David Rowley writes:
> I've started working on something I've ended up calling "Super
> PathKeys". The idea here is to increase the likelihood of a Path with
> PathKeys being used for a purpose that requires a less strict sort
> order due to ordering being required from the return value of some
On Tue, 30 Oct 2018 at 07:58, David Rowley
wrote:
> I've started working on something I've ended up calling "Super
> PathKeys". The idea here is to increase the likelihood of a Path with
> PathKeys being used for a purpose that requires a less strict sort
> order due to ordering being required
Dear Hackers,
I've started working on something I've ended up calling "Super
PathKeys". The idea here is to increase the likelihood of a Path with
PathKeys being used for a purpose that requires a less strict sort
order due to ordering being required from the return value of some
precision loss
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