| From: | Peter Geoghegan <pg(at)heroku(dot)com> |
|---|---|
| To: | Andrew Dunstan <andrew(at)dunslane(dot)net> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Josh Berkus <josh(at)agliodbs(dot)com>, Petr Jelinek <petr(at)2ndquadrant(dot)com>, Jim Nasby <Jim(dot)Nasby(at)bluetreble(dot)com>, Marko Tiikkaja <marko(at)joh(dot)to>, Ryan Pedela <rpedela(at)datalanche(dot)com>, Dmitry Dolgov <9erthalion6(at)gmail(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org>, Ilya Ashchepkov <koctep(at)gmail(dot)com> |
| Subject: | Re: jsonb concatenate operator's semantics seem questionable |
| Date: | 2015-05-24 19:17:35 |
| Message-ID: | CAM3SWZR2km+oBLErS9neM4+bSokA88wUYFDDUX239ogDoNbLkg@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Thu, May 21, 2015 at 2:25 PM, Andrew Dunstan <andrew(at)dunslane(dot)net> wrote:
> This change really makes this set of jsonb features quite a bit more
> compelling. I'm glad I thought of it - wish I had done so earlier. So
> notwithstanding the controversy upthread, I think this is a good result.
I think that we should look into making jsonb support array-style
subscripting within updates (to update "nested subdatums" directly).
This would make the new concatenate operator a lot more compelling.
Also, UPDATE targetlists don't accept a table qualification in their
targetlist (for the assign-to column) because the parser similarly
needs to support updating composite type's "nested subdatums"
directly.
Having gone to the trouble of making the parser support this stuff (in
a way that makes us not follow the SQL standard in a couple of
places), we ought to have a similar capability for jsonb. I haven't
looked into it, but it seems like a good project for 9.6. I'm not
volunteering to undertake the project, though.
--
Peter Geoghegan
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