Thanks, Ryan Pedela Datalanche CEO, founder www.datalanche.com
On Tue, Aug 9, 2016 at 11:58 AM, Tom Lane <t...@sss.pgh.pa.us> wrote: > Bruce Momjian <br...@momjian.us> writes: > > Does anyone know why the phrase distance "<3>" was changed from "at most > > three tokens away" to "exactly three tokens away"? > > So that it would correctly support phraseto_tsquery's use of the operator > to represent omitted words (stopwords) in a phrase. > > I think there's probably some use in also providing an operator that does > "at most this many tokens away", but Oleg/Teodor were evidently less > excited, because they didn't take the time to do it. > > The thread where this change was discussed is > > https://www.postgresql.org/message-id/flat/c19fcfec308e6ccd952cdde9e648b5 > 05%40mail.gmail.com > > see particularly > > https://www.postgresql.org/message-id/11252.1465422251%40sss.pgh.pa.us I would say that it is worth it to have a "phrase slop" operator (Apache Lucene terminology). Proximity search is extremely useful for improving relevance and phrase slop is one of the tools to achieve that.
