| From: | Mark Rofail <markm(dot)rofail(at)gmail(dot)com> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> |
| Cc: | Alexander Korotkov <aekorotkov(at)gmail(dot)com>, Andreas Karlsson <andreas(at)proxel(dot)se>, David Steele <david(at)pgmasters(dot)net>, Erik Rijkers <er(at)xs4all(dot)nl>, Hans-Jürgen Schönig <hs(at)cybertec(dot)at>, Joel Jacobson <joel(at)compiler(dot)org>, Justin Pryzby <pryzby(at)telsasoft(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, Robert Haas <robertmhaas(at)gmail(dot)com>, Stephen Frost <sfrost(at)snowman(dot)net>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Zhihong Yu <zyu(at)yugabyte(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [HACKERS] GSoC 2017: Foreign Key Arrays |
| Date: | 2021-03-27 20:21:29 |
| Message-ID: | CAJvoCuswKzt3XYEoxigoY+j=vVBH2Ry17emEmQJHEGawejKUzw@mail.gmail.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
Hello Alvaro,
Looking at 0001+0003, I see it claims GIN support for <<@ and @>>, but
> actually only the former is implemented fully; the latter is missing a
> strategy number in ginarrayproc.c and pg_amop.dat, and also
> src/test/regress/sql/gin.sql does not test it. I suspect
> ginqueryarrayextract needs to be told about this too.
GIN/array_ops requires the left operand to be an array, so only @>> can be
used in GIN. However, <<@ is defined as @>> commutative counterpart, so
when for example “5 <<@ index” it will be translated to “index @>> index”
thus indirectly using the GIN index.
We can definitely add tests to “ src/test/regress/sql/gin.sql” to test
this. Do you agree?
Also what do you mean by “ ginqueryarrayextract needs to be told about this
too”?
Best Regards,
Mark Rofail
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Joel Jacobson | 2021-03-27 20:27:51 | Idea: Avoid JOINs by using path expressions to follow FKs |
| Previous Message | alvherre@alvh.no-ip.org | 2021-03-27 20:04:42 | Re: libpq debug log |