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From Roman Chyla <roman.ch...@gmail.com>
Subject Re: Anti-Pattern in lucent-join jar?
Date Fri, 05 Dec 2014 03:43:39 GMT
+1, additionally (as it follows from your observation) the query can get
out of sync with the index, if eg it was saved for later use and ran
against newly opened searcher

Roman
On 4 Dec 2014 10:51, "Darin Amos" <darincs@gmail.com> wrote:

> Hello All,
>
> I have been doing a lot of research in building some custom queries and I
> have been looking at the Lucene Join library as a reference. I noticed
> something that I believe could actually have a negative side effect.
>
> Specifically I was looking at the JoinUtil.createJoinQuery(…) method and
> within that method you see the following code:
>
>         TermsWithScoreCollector termsWithScoreCollector =
>             TermsWithScoreCollector.create(fromField,
> multipleValuesPerDocument, scoreMode);
>         fromSearcher.search(fromQuery, termsWithScoreCollector);
>
> As you can see, when the JoinQuery is being built, the code is executing
> the query that is wraps with it’s own collector to collect all the scores.
> If I were to write a query parser using this library (which someone has
> done here), doesn’t this reduce the benefit of the SOLR query cache? The
> wrapped query is being executing when the Join Query is being constructed,
> not when it is executed.
>
> Thanks
>
> Darin
>

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