Supply FilterIndexReader based on any o.a.l.search.Filter
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Key: LUCENE-3212
URL: https://issues.apache.org/jira/browse/LUCENE-3212
Project: Lucene - Java
Issue Type: Improvement
Components: core/index, core/search
Affects Versions: 4.0
Reporter: Uwe Schindler
Assignee: Uwe Schindler
Fix For: 4.0
When coding LUCENE-2919 (PKIndexSplitter), Mike and me had the idea, how to
effectively apply filters on the lowest level (before query execution). This is
very useful for e.g. security Filters that simply hide some documents.
Currently when you apply the filter after searching, lots of useless work was
done like scoring filtered documents, iterating term positions (for Phrases),...
This patch will provide a FilterIndexReader subclass (4.0 only, 3.x is too
complicated to implement), that hides filtered documents by returning them in
getDeletedDocs(). In contrast to LUCENE-2919, the filtering will work on
per-segment (without SlowMultiReaderWrapper), so per segment search keeps
available and reopening can be done very efficient, as the filter is only
calculated on openeing new or changed segments.
This filter should improve use-cases where the filter can be applied one time
before all queries (like security filters) on (re-)opening the IndexReader.
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