On Thu, Nov 3, 2011 at 11:01 PM, Tom Lane
<tgl@sss.pgh.pa.us> wrote:
Yoann Moreau <
yoann.moreau@univ-avignon.fr> writes:
> I'm using a GIN index for a text column on a big table. I use it to rank
> the rows, but I also need to get the term positions for each document of a
> subset of documents for one or more terms. I suppose these positions are stored
> in the index as the to_tsvector shows them : 'lexeme':{positions}
--- it only knows about the strings. Don't know one way or the other
about GIST.
GiST index doesn't store positions too. See gtsvector_compress. It converts tsvector to array of crc32 of words. If that value is anyway too large then function converts it to signature.
------
With best regards,
Alexander Korotkov.
