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https://issues.apache.org/jira/browse/LUCENE-6106?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand resolved LUCENE-6106.
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Resolution: Fixed
Fix Version/s: Trunk
5.0
> Improve FilterCachingPolicy statistics computation
> --------------------------------------------------
>
> Key: LUCENE-6106
> URL: https://issues.apache.org/jira/browse/LUCENE-6106
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Fix For: 5.0, Trunk
>
> Attachments: LUCENE-6106.patch
>
>
> Currently FilterCachingPolicy.onCache is supposed to be called every time
> that FilterCache.onCache is used. However, this does not necessarily reflect
> how much a filter is used. For instance you can call cache and not use the
> filter, or call cache once and then use it a hundred times. It would be more
> useful to know how many times a filter has been used on a top level reader,
> and I think we can do this by doing something like below in the caching
> wrapper filter?
> {code}
> @Override
> public DocIdSet getDocIdSet(LeafReaderContext context, Bits acceptDocs)
> throws IOException {
> if (context.ord == 0) {
> // increment counter
> }
> }
> {code}
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