Re: SQL/JSON: functions

From: Nikita Glukhov <n(dot)gluhov(at)postgrespro(dot)ru>
To: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
Cc: PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Erik Rijkers <er(at)xs4all(dot)nl>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Thomas Munro <thomas(dot)munro(at)gmail(dot)com>, Andrew Alsup <bluesbreaker(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Dmitry Dolgov <9erthalion6(at)gmail(dot)com>, Oleg Bartunov <obartunov(at)postgrespro(dot)ru>, Alexander Korotkov <a(dot)korotkov(at)postgrespro(dot)ru>, Michael Paquier <michael(at)paquier(dot)xyz>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Andrew Dunstan <andrew(dot)dunstan(at)2ndquadrant(dot)com>
Subject: Re: SQL/JSON: functions
Date: 2020-03-23 17:28:52
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Attached 47th version of the patches.

On 21.03.2020 22:38, Pavel Stehule wrote:
> On 21. 3. 2020 v 11:07 Nikita Glukhov <n(dot)gluhov(at)postgrespro(dot)ru
> <mailto:n(dot)gluhov(at)postgrespro(dot)ru>> wrote:
> Attached 46th version of the patches.
> On 20.03.2020 22:34, Pavel Stehule wrote:
>> On 19.03.2020 23:57 Nikita Glukhov <n(dot)gluhov(at)postgrespro(dot)ru
>> <mailto:n(dot)gluhov(at)postgrespro(dot)ru>> wrote:
>> Attached 45th version of the patches.
>> Nodes JsonFormat, JsonReturning, JsonPassing, JsonBehavior were fixed.
>> On 17.03.2020 21:35, Pavel Stehule wrote:
>>> User functions json[b]_build_object_ext() and json[b]_build_array_ext() also
>>> can be easily removed. But it seems harder to remove new aggregate functions
>>> json[b]_objectagg() and json[b]_agg_strict(), because they can't be called
>>> directly from JsonCtorExpr node.
>>> I don't see reasons for another reduction now. Can be great
>>> if you can finalize work what you plan for pg13.
> I have removed json[b]_build_object_ext() and json[b]_build_array_ext().
> But json[b]_objectagg() and json[b]_agg_strict() are still present.
> It seems that removing them requires majors refactoring of the execution
> of Aggref and WindowFunc nodes.
I have replaced aggregate function

json[b]_objectagg(key any, val any, absent_on_null boolean, unique_keys boolean)

with three separate functions:

json[b]_object_agg_strict(any, any)
json[b]_object_agg_unique(any, any)
json[b]_object_agg_unique_strict(any, any)

This should be more correct than single aggregate with additional parameters.

Nikita Glukhov
Postgres Professional:
The Russian Postgres Company

Attachment Content-Type Size
0001-Add-common-SQL_JSON-clauses-v47.patch.gz application/gzip 8.0 KB
0002-SQLJSON-constructors-v47.patch.gz application/gzip 32.2 KB
0003-IS-JSON-predicate-v47.patch.gz application/gzip 12.5 KB
0004-SQLJSON-query-functions-v47.patch.gz application/gzip 36.6 KB

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