Hi,
Aggregate UDF's are nice, but I think it's a mistake to think about them
only in classic COUNT(), AVG(), SUM() etc. context. Why we don't look at
them in more general way?
Aggregates loop over input set and produce single value. Right now we do
UDF-like aggregates inside PSQL SP using
01.10.2018 11:24, Pavel Cisar wrote:
Aggregates could produce various single-value outputs
Why to limit them to single value? Some aggregates could profit if they are able to
return more values at once. For example, avg + deviation.
--
WBR, SD.
Firebird-Devel mailing list, web
Usage of "BLOB SUB_TYPE TEXT" for "free" parameters
---
Key: CORE-5932
URL: http://tracker.firebirdsql.org/browse/CORE-5932
Project: Firebird Core
Issue Type: Improvement
Components:
Dimitry Sibiryakov wrote Mon, 01 Oct 2018 12:44:58
+0300:
01.10.2018 11:24, Pavel Cisar wrote:
Aggregates could produce various single-value outputs
Why to limit them to single value? Some aggregates could profit if
they are able to return more values at once. For example, avg +
Hello,
Firebird 3.0.4
Could anybody (Adriano?) confirm, that next result is corrected:
select
null or trueas c4__null_or_true, /* TRUE */
null or false as c5__null_or_false, /* NULL */
null and true as c6__null_and_true, /* NULL */
null and false as
Hi,
I know that i am not Firebird core developer and I have less influence.
But, why do you still say about WHILE, SUSSPEND, YIELD, FETCH if there is
simple alternative to not have it at all?
Can someone tell me what is wrong with my proposition?
01.10.2018 12:22, Simonov Denis via Firebird-devel wrote:
Current SPs do not know how to aggregate data by an external cursor. To do this, you need
to write queries inside the SP.
How is this related to (in)ability to return several values at once?
create aggregate function custom_avg (i
incompatible RPM with CentOS 7
--
Key: CORE-5933
URL: http://tracker.firebirdsql.org/browse/CORE-5933
Project: Firebird Core
Issue Type: Bug
Affects Versions: 2.5.8
Environment: CentOS Linux release
Dimitry Sibiryakov wrote Mon, 01 Oct 2018 13:28:44
+0300:
01.10.2018 12:22, Simonov Denis via Firebird-devel wrote:
Current SPs do not know how to aggregate data by an external cursor. To
do this, you need to write queries inside the SP.
How is this related to (in)ability to return
On 10/01/18 12:44, Dimitry Sibiryakov wrote:
01.10.2018 11:24, Pavel Cisar wrote:
Aggregates could produce various single-value outputs
Why to limit them to single value? Some aggregates could profit if
they are able to return more values at once. For example, avg +
deviation.
That
Adriano dos Santos Fernandes wrote Sat, 29 Sep 2018
22:55:52 +0300:
So SUSPEND in this context is very like JS YIELD with caller doing a
reduce.
I have even thought in use YIELD keyword in this context.
Adriano
The keyword YEILD is more preferable for aggregate functions. At the
On 01/10/2018 07:28, Dimitry Sibiryakov wrote:
> 01.10.2018 12:22, Simonov Denis via Firebird-devel wrote:
>> Current SPs do not know how to aggregate data by an external cursor.
>> To do this, you need to write queries inside the SP.
>
> How is this related to (in)ability to return several
01.10.2018 12:07, Simonov Denis via Firebird-devel wrote:
To return more than one value you need support for ROW types. Otherwise, the function
still does not extract more than one value.
Current SP can return several values without any new type.
--
WBR, SD.
Firebird-Devel mailing
Dimitry Sibiryakov wrote Mon, 01 Oct 2018 13:12:36
+0300:
01.10.2018 12:07, Simonov Denis via Firebird-devel wrote:
To return more than one value you need support for ROW types.
Otherwise, the function still does not extract more than one value.
Current SP can return several values
01.10.2018 12:41, Adriano dos Santos Fernandes wrote:
Saying that aggregate functions should return more than one data with a
feature different than ROW type, is like saying our function (and any
language's function) is broken.
No thing is broken. ROW type is just a syntax sugar. But if you
Kovalenko Dmitry wrote Mon, 01 Oct 2018
19:18:23 +0300:
Hello,
Firebird 3.0.4
Could anybody (Adriano?) confirm, that next result is corrected:
select
null or trueas c4__null_or_true, /* TRUE */
null or false as c5__null_or_false, /* NULL */
null and true as
On 01/10/2018 09:46, Alex Peshkoff via Firebird-devel wrote:
> On 10/01/18 12:44, Dimitry Sibiryakov wrote:
>> 01.10.2018 11:24, Pavel Cisar wrote:
>>> Aggregates could produce various single-value outputs
>>
>> Why to limit them to single value? Some aggregates could profit if
>> they are able
01.10.2018 15:35, Adriano dos Santos Fernandes wrote:
A single (aggregate) function call should not produce (describe) more
than one column in a query.
Where is such limitation described except current codebase?
--
WBR, SD.
Firebird-Devel mailing list, web interface at
01.10.2018 16:27, Adriano dos Santos Fernandes wrote:
Usage of FETCH seems good here, then I believe the production of rows
would need a YIELD .
Why to invent a new syntax instead of assignment + SUSPEND which everybody
got used to?
--
WBR, SD.
Firebird-Devel mailing list, web
On 01/10/2018 10:49, Dimitry Sibiryakov wrote:
> 01.10.2018 15:35, Adriano dos Santos Fernandes wrote:
>> A single (aggregate) function call should not produce (describe) more
>> than one column in a query.
>
> Where is such limitation described except current codebase?
>
>
avg_deviation(x) + 10
On 30/09/2018 06:25, Dimitry Sibiryakov wrote:
> 30.09.2018 4:52, Adriano dos Santos Fernandes wrote:
>> - Instead of agg_finished, adjust SUSPEND (probably with another
>> keyword) to somehing like: SUSPEND WHEN FETCHED DO WHEN
>> FINISHED DO
>
> Isn't it how FETCH is used to be used:
>
>
On 1-10-2018 18:18, Kovalenko Dmitry wrote:
Hello,
Firebird 3.0.4
Could anybody (Adriano?) confirm, that next result is corrected:
select
null or true as c4__null_or_true, /* TRUE */
null or false as c5__null_or_false, /* NULL */
null and true as c6__null_and_true, /*
Hello Mark and Denis,
>> Just – yes or no :)
>Yes, and verified against SQL:2016.
>
Thank :)
Dmitry Kovalenko
Firebird-Devel mailing list, web interface at
https://lists.sourceforge.net/lists/listinfo/firebird-devel
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