Erik Hatcher wrote:
I have a potential need for a SpanNearQuery with an exact non-zero gap
specified
Ironically, you can now easily specify this with PhraseQuery, but not
with SpanNearQuery. You can construct a phrase query with explicit
positions, e.g.:
PhraseQuery pq = new PhraseQuery();
pq.add(new Term("f", "x"), 0);
pq.add(new Term("f", "y"), 2);
This will match instances of "x" and "y" with exactly one word between
them in field "f".
Unfortunately one cannot (yet) construct a SpanNearQuery with explicit
positions. I think that would be useful, and not too hard to add.
Internally all the computation is in terms of positions, so adding this
is mostly a matter of exposing this in the public API.
Would this be as easy as modifying SpanNearQuery to have a minimum and
maximum slop feature, and modifying NearSpans.checkSlop() to add a
condition that the difference is >= the minimum slop? At first glance
it seems so, but I want to be sure I'm not missing something.
If you want to match something like "a ? b ? ? c", where "?" matches any
word, then slop is not sufficient, you really need explicit positions,
or else you'll match things like "a ? ? b ? c".
Doug
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