| From: | Chapman Flack <chap(at)anastigmatix(dot)net> |
|---|---|
| To: | Ildar Musin <i(dot)musin(at)postgrespro(dot)ru>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Ashutosh Bapat <ashutosh(dot)bapat(at)enterprisedb(dot)com> |
| Cc: | Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: MAP syntax for arrays |
| Date: | 2018-05-08 13:19:31 |
| Message-ID: | 4cc3a217-20a7-5a77-2085-099ca04a6e3f@anastigmatix.net |
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| Lists: | pgsql-hackers |
On 05/08/2018 08:57 AM, Ildar Musin wrote:
>
> select map (pow(2, x) - 1 for x in array[1,2,3,4,5]);
I wonder how efficient an implementation would be possible strictly
as a function, without grammar changes?
While PostgreSQL certainly has extensions to and divergences from
standard SQL syntax, some historical and some recent, it seems like
there ought to be a highish bar for adding new ones; or, looking at it
another way, has this feature been proposed to the SQL committee?
It doesn't sound like a bad idea, and supporting new syntax for it
would be an easier call it if it were known to be in an SQL draft
somewhere.
-Chap
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