Hi all, hi Alan,
I am currently rewriting some SpanQuery code to use IntervalQuery. Most of the
transformations can be done quite easily and it is also better to read after
transformation. What I am missing a bit is some document to compare the
different query types and a guide how to convert those.
I did not find a replacement for SpanFirstQuery (or at least any query stat
takes absolute positions). I know intervals more deal with term intervals, but
I was successful in replacing a SpanFirstQuery with this:
IntervalsSource term = Intervals.term("foo");
IntervalsSource filtered = new
FilteredIntervalsSource("FIRST"+distance, term) {
@Override
protected boolean accept(IntervalIterator it) {
return it.end() < distance; // or should this be <= distance???
}
};
Query = new IntervalQuery(field, iv2);
I am not fully sure if this works under all circumstances 😊. To me it looks
fine and also did work with more complex intervals than "term". If this is ok,
how about adding a "first(int n, IntervalsSource iv)" method to Intervals class?
The second question: What's the "closest" replacement for a PhraseQuery with
slop? Should I use maxwidth(slop + 1) or maxgaps(slop-1) or maxgaps(slop). I
know SpanQuery slops cannot be fully replaced with intervals, but I don't care
about those SpanQuery bugs.
Uwe
-----
Uwe Schindler
Achterdiek 19, D-28357 Bremen
https://www.thetaphi.de
eMail: u...@thetaphi.de
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