| From: | Mark Rofail <markm(dot)rofail(at)gmail(dot)com> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> |
| Cc: | Andreas Karlsson <andreas(at)proxel(dot)se>, Alexander Korotkov <aekorotkov(at)gmail(dot)com>, Stephen Frost <sfrost(at)snowman(dot)net>, David Steele <david(at)pgmasters(dot)net>, Erik Rijkers <er(at)xs4all(dot)nl>, Robert Haas <robertmhaas(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Hans-Jürgen Schönig <hs(at)cybertec(dot)at> |
| Subject: | Re: [HACKERS] GSoC 2017: Foreign Key Arrays |
| Date: | 2018-01-12 21:19:29 |
| Message-ID: | CAJvoCuvi8JREomcteEpy3LQ3m=w0TuPUj4B9vwuJE_+3kSqAPA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Mon, Nov 13, 2017 at 2:41 AM, Andreas Karlsson <andreas(at)proxel(dot)se> wrote:
> I think the code would look cleaner if you generate the following query:
>
> SELECT fk.x, fk.ys FROM ONLY t2 fk CROSS JOIN LATERAL
> pg_catalog.unnest(ys) a2 (v) LEFT OUTER JOIN ONLY t1 pk ON pk.x = fk.x AND
> pk.y = a2.v WHERE [...]
>
> rather than:
>
> SELECT fk.k1, fk.ak2 FROM (SELECT x k1, pg_catalog.unnest(ys) k2, ys ak2
> FROM ONLY t2) fk LEFT OUTER JOIN ONLY t1 pk ON pk.x = fk.k1 AND pk.y =
> fk.k2 WHERE [...]
>
Andreas has kindly written the SQL query for us. My problem is generating
it with C code
Best Regards,
Mark Rofail
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