| From: | Kevin Grittner <kgrittn(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Benedikt Grundmann <bgrundmann(at)janestreet(dot)com>, PostgreSQL-Dev <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Death by regexp_replace |
| Date: | 2016-01-15 15:48:25 |
| Message-ID: | CACjxUsNhFSYT9kCzf7RYb9Cr0e=48J-kjHvrH0BD0xNGuRfR+g@mail.gmail.com |
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| Lists: | pgsql-hackers pgsql-www |
On Fri, Jan 15, 2016 at 9:33 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> *WARNING DO NOT DO THIS ON A PRODUCTION BOX*
>> select regexp_replace('VODI GR,VOD LN,VOD LN,VODN MM,VODPF US,VOD US,VZC
>> LN', '([^,]+)(,*\1)+', '\1');
> This responds to cancel just fine for me.
> (FWIW, I think you probably wanted ,+ not ,* in the regex, else there's
> practically no constraint there, leading to having to consider O(N^2)
> or more possibilities.)
On master (commit cf7dfbf2) it responds to pg_cancel_backend(),
but it seems to be in an endless loop until you do that.
--
Kevin Grittner
EDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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