Tom Lane wrote:
>
> mlw <markw@mohawksoft.com> writes:
> > I have a working version of a text search engine. I want to make it work
> > for Postgres (I will be releasing it GPL). It can literally find the
> > occurrence of a string of words within 5 million records in a few
> > milliseconds.
>
> Where are the records coming from? Are they inside the database?
> (If not, why do you care about integrating this with Postgres?)
>
> It seems like the right way to integrate this sort of functionality
> is to turn it into a kind of index, so that you can do
>
> SELECT * FROM mytable WHERE keyfield ~~~ 'search string';
>
> where ~~~ is the name of some operator that is associated with the
> index. The temporary-table approach you are taking seems inherently
> klugy, and would still be awkward even if we had functions returning
> recordsets...
Oh! Another method I tried and just could not get working was returning
an array of integers. I as thinking about "select * from table where
key_field in ( textsearch('bla bla') ), but I haven't been able to get
that to work, and as per a previous post and belatedly reading a FAQ,
this would probably still force a full table scan.
Another method I thought about was having a table with some maximum
number of zero initialized records, and trying something like:
create table temp_table as select * from ts_template limit
textsearch('bla bla', 10);
select filltable(temp_table, 10);
select * from table where key_field = temp_table.key;
As you can see, all of these ideas are heinous hacks, there has to be a
better way. Surely someone has a better idea.
--
http://www.mohawksoft.com
