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From Michael Sokolov <msoko...@gmail.com>
Subject Re: position-anchored queries
Date Thu, 21 Mar 2019 13:18:17 GMT
Thanks Mikhail; I see SpanPositionRangeQuery, SpanFirstQuery, and thanks
Adrien for confirming there is no max position. I have a legacy system that
indexes anchor tokens at beginning and end, and am checking if there is a
better approach. It seems as if we could get rid of the start token, but we
may need to keep the end token to support that feature.

-Mike


On Thu, Mar 21, 2019 at 9:10 AM Adrien Grand <jpountz@gmail.com> wrote:

> We don't track of the maximum position per doc. One way to do
> ends-with queries would be to write a token filter that emits a
> special token at the end of the wrapped token stream and use it as the
> last token of a phrase query.
>
> On Thu, Mar 21, 2019 at 1:29 PM Michael Sokolov <msokolov@gmail.com>
> wrote:
> >
> > Hi, if I want to write a begins-with, ends-with, or exact-match style
> > query; like a phrase query, but anchored to the beginning of a field, the
> > end, or both, is there a generally-accepted best way? I can see how to
> > maybe create a positional query that specifies the exact position for
> each
> > term (at least in theory -- I'm not sure if there is a Query that does
> > this?) but do we keep track of max(position, field, doc) so I can know
> that
> > there are not any subsequent terms in the field?
> >
> > -Mike
>
>
>
> --
> Adrien
>
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