| From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
|---|---|
| To: | Peter Geoghegan <pg(at)heroku(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Abhijit Menon-Sen <ams(at)2ndquadrant(dot)com>, PostgreSQL mailing lists <pgsql-hackers(at)postgresql(dot)org>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Josh Berkus <josh(at)agliodbs(dot)com>, Ian Barwick <ian(at)2ndquadrant(dot)com>, Andres Freund <andres(at)2ndquadrant(dot)com>, Greg Stark <stark(at)mit(dot)edu>, Jim Nasby <jim(at)nasby(dot)net>, Albe Laurenz <laurenz(dot)albe(at)wien(dot)gv(dot)at> |
| Subject: | Re: Doing better at HINTing an appropriate column within errorMissingColumn() |
| Date: | 2014-07-23 23:18:15 |
| Message-ID: | 20140723231815.GD5475@eldon.alvh.no-ip.org |
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| Lists: | pgsql-hackers |
Peter Geoghegan wrote:
> Maybe that would be marginally better than classic Levenshtein
> distance, but I doubt it would pay for itself. It's just more code to
> maintain. Are we really expecting to not get the best possible
> suggestion due to some number of transposition errors very frequently?
> You still have to have a worse suggestion spuriously get ahead of
> yours, and typically there just aren't that many to begin with. I'm
> not targeting spelling errors so much as thinkos around plurals and
> whether or not an underscore was used. Damerau-Levenshtein seems like
> an algorithm with fairly specialized applications.
Yes, it's for typos. I guess it's an unfrequent scenario to have both a
typoed column and a column that's missing the plural declension, which
is the case in which Damerau-Lvsh would be a win.
--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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