Re: Simplifying Text Search

On Wed, 14 Nov 2007, Tom Lane wrote:

> Bruce Momjian <bruce(at)momjian(dot)us> writes:
>> Yes, this the same problem we had months ago trying to improve the
>> syntax, that there was no easy syntax that covered all common use cases.
>
> The thing that we keep coming up against is that we'd like queries to
> be able to depend on default_text_search_config. Quite aside from
> anyone's personal opinions about whether operator or function syntax
> is preferable, it would clearly be desirable to be able to say
>
> ... WHERE textcolumn @@ 'pattern-constant'
>
> and get a fast full-text search that's governed by the current setting
> of default_text_search_config (of course, it can only be fast if there
> is an index using that same configuration, but that's a setup detail).
>
> It strikes me that now that we have an invalidatable plan cache,
> we could fix this by having the planner rewrite "textcolumn @@ something"
> into "to_tsvector(regconfig_constant, textcolumn) @@ something",
> so long as it marked the resulting plan as needing to be invalidated
> by any change in the value of default_text_search_config. Once you
> have that form, it can be matched against an index, and away you go.
>
> Too late for 8.3, but seems doable enough for 8.4.

cute, pity it's didn't come up in our early discussion

>
> regards, tom lane
>
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Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: oleg(at)sai(dot)msu(dot)su, http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83