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Re: Prefix search on all hstore values - Mailing list pgsql-general

From Albert Chern
Subject Re: Prefix search on all hstore values
Date
Msg-id CAEg5N09AgbT8mgz9izK7Vtr6F0=AvGKsyaCvqhd4gZDAMovp6Q@mail.gmail.com
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In response to Re: Prefix search on all hstore values  (Sergey Konoplev <gray.ru@gmail.com>)
Responses Re: Prefix search on all hstore values
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Thanks for the suggestions!

My requirements can be relaxed to full text search, but the problem I had with that approach is I have strings in Chinese, and postgres doesn't seem to support it.  Calling to_tsvector() on Chinese characters always returns an empty vector.

A separate table will definitely work, but I was hoping for something more straightforward.  I'll use that approach if necessary though.


On Thu, Nov 28, 2013 at 4:51 PM, Sergey Konoplev <gray.ru@gmail.com> wrote:
On Thu, Nov 28, 2013 at 12:44 AM, Teodor Sigaev <teodor@sigaev.ru> wrote:
> Full-text search has this feature.
>
> # select to_tsvector('en_name=>yes, fr_name=>oui'::hstore::text) @@ 'en:*';
>  ?column?
> ----------
>  t
>
> or (index only keys)
>
> select to_tsvector(akeys('en_name=>yes, fr_name=>oui'::hstore)::text) @@
> 'en:*';
>  ?column?
> ----------
>  t
>
> To speed up this queries you use functional indexes.

It wont work. The OP needs to search by values prefixes, not by any
separate word in the hstore.

# select to_tsvector('en_name=>"oh yes", fr_name=>oui'::hstore::text) @@ 'ye:*';
 ?column?
----------
 t

--
Kind regards,
Sergey Konoplev
PostgreSQL Consultant and DBA

http://www.linkedin.com/in/grayhemp
+1 (415) 867-9984, +7 (901) 903-0499, +7 (988) 888-1979
gray.ru@gmail.com

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