| From: | Jeff Janes <jeff(dot)janes(at)gmail(dot)com> |
|---|---|
| To: | Dimitri Fontaine <dimitri(at)2ndquadrant(dot)fr> |
| Cc: | PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Save Hash Indexes |
| Date: | 2013-11-01 15:37:42 |
| Message-ID: | CAMkU=1z5rVnypCdaGieD988EoQzzmS0ga8HeA2RJbje=0a=NRA@mail.gmail.com |
| Views: | Whole Thread | Raw Message | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
On Fri, Nov 1, 2013 at 6:31 AM, Dimitri Fontaine <dimitri(at)2ndquadrant(dot)fr>wrote:
> Hi,
>
> Here's an idea: when a user ask for an Hash Index transparently build a
> BTree index over an hash function instead.
>
Could something be added to the planner so that you can just build a btree
index on a hash expression, and have the planner automatically realize it
can used for an equality query because if a=b, then md5(a)=md5(b), at least
for some data types? A general ability to recognize things like that seems
like it might have other uses as well.
Cheers,
Jeff
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Daniel Farina | 2013-11-01 15:52:33 | Re: Save Hash Indexes |
| Previous Message | Atri Sharma | 2013-11-01 14:53:59 | Re: Save Hash Indexes |