On Fri, Jul 15, 2011 at 10:02 AM, Trieu, Jason T
<trieu.ja...@con-way.com> wrote:
> Hi all,
>
> I read postings about searching for empty field with but did not find any
> cases of successful search using query language syntax itself(-myField:[* TO
> *] for example).
We have been using: -myField:*
You would need to use setAllowLeadingWildcard on the QueryParser and
it wouldn't exactly be fast, but it works for us.
The suggestion to use a magic token is a good idea, though I would put
it in a separate field called "has" or something... so you can do:
has:title (same results as title:* but quicker to run)
The crappy thing is that to actually detect if there are any tokens in
the field you need to make a TokenStream which can be used to read the
first token and then rewind again. I'm not sure if there is such a
thing in Lucene at the moment. We had to write it ourselves but we
were on a considerably older version at the time.
TX
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