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From "Mark Miller (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-584) Decouple Filter from BitSet
Date Mon, 10 Mar 2008 21:32:46 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12577207#action_12577207
] 

Mark Miller commented on LUCENE-584:
------------------------------------

I think there is still an issue here. The code below just broke for me.

java.lang.ClassCastException: org.apache.lucene.util.OpenBitSet cannot be cast to java.util.BitSet
	at org.apache.lucene.search.CachingWrapperFilter.bits(CachingWrapperFilter.java:55)
	at org.apache.lucene.misc.ChainedFilter.bits(ChainedFilter.java:177)
	at org.apache.lucene.misc.ChainedFilter.bits(ChainedFilter.java:152)
	at org.apache.lucene.search.Filter.getDocIdSet(Filter.java:49)

{code}
  public void testChainedCachedQueryFilter() throws IOException, ParseException {
    String path = "c:/TestIndex";
    Analyzer analyzer = new WhitespaceAnalyzer();
    IndexWriter writer = new IndexWriter(path, analyzer, true);

    Document doc = new Document();
    doc.add(new Field("category", "red", Store.YES, Index.TOKENIZED));
    doc.add(new Field("content", "the big bad fox", Store.NO, Index.TOKENIZED));
    writer.addDocument(doc);
    doc = new Document();
    doc.add(new Field("category", "red", Store.YES, Index.TOKENIZED));
    doc.add(new Field("content", "the big bad pig", Store.NO, Index.TOKENIZED));
    writer.addDocument(doc);
    doc = new Document();
    doc.add(new Field("category", "red", Store.YES, Index.TOKENIZED));
    doc.add(new Field("content", "the horrific girl", Store.NO, Index.TOKENIZED));
    writer.addDocument(doc);
    doc = new Document();
    doc.add(new Field("category", "blue", Store.YES, Index.TOKENIZED));
    doc.add(new Field("content", "the dirty boy", Store.NO, Index.TOKENIZED));
    writer.addDocument(doc);
    doc = new Document();
    doc.add(new Field("category", "blue", Store.YES, Index.TOKENIZED));
    doc.add(new Field("content", "the careful bad fox", Store.NO, Index.TOKENIZED));
    writer.addDocument(doc);

    writer.addDocument(doc);

    Searcher searcher = null;

    searcher = new IndexSearcher(path);

    QueryParser qp = new QueryParser("field", new KeywordAnalyzer());
    Query query = qp.parse("content:fox");
    QueryWrapperFilter queryFilter = new QueryWrapperFilter(query);
    CachingWrapperFilter cwf = new CachingWrapperFilter(queryFilter);

    TopDocs hits = searcher.search(query, cwf, 1);
    System.out.println("hits:" + hits.totalHits);

    queryFilter = new QueryWrapperFilter(qp.parse("category:red"));
    CachingWrapperFilter fcwf = new CachingWrapperFilter(queryFilter);
    Filter[] chain = new Filter[2];
    chain[0] = cwf;
    chain[1] = fcwf;
    ChainedFilter cf = new ChainedFilter(chain, ChainedFilter.AND);

    hits = searcher.search(new MatchAllDocsQuery(), cf, 1);

    System.out.println("red:" + hits.totalHits);

    queryFilter = new QueryWrapperFilter(qp.parse("category:blue"));
    CachingWrapperFilter fbcwf = new CachingWrapperFilter(queryFilter);
    chain = new Filter[2];
    chain[0] = cwf;
    chain[1] = fbcwf;
    cf = new ChainedFilter(chain, ChainedFilter.AND);

    hits = searcher.search(new MatchAllDocsQuery(), cf, 1);

    System.out.println("blue:" + hits.totalHits);

  }

{code}



> Decouple Filter from BitSet
> ---------------------------
>
>                 Key: LUCENE-584
>                 URL: https://issues.apache.org/jira/browse/LUCENE-584
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>    Affects Versions: 2.1
>            Reporter: Peter Schäfer
>            Assignee: Michael Busch
>            Priority: Minor
>             Fix For: 2.4
>
>         Attachments: bench-diff.txt, bench-diff.txt, CHANGES.txt.patch, ContribQueries20080111.patch,
lucene-584-take2.patch, lucene-584-take3-part1.patch, lucene-584-take3-part2.patch, lucene-584-take4-part1.patch,
lucene-584-take4-part2.patch, lucene-584-take5-part1.patch, lucene-584-take5-part2.patch,
lucene-584.patch, Matcher-20070905-2default.patch, Matcher-20070905-3core.patch, Matcher-20071122-1ground.patch,
Some Matchers.zip, Test20080111.patch
>
>
> {code}
> package org.apache.lucene.search;
> public abstract class Filter implements java.io.Serializable 
> {
>   public abstract AbstractBitSet bits(IndexReader reader) throws IOException;
> }
> public interface AbstractBitSet 
> {
>   public boolean get(int index);
> }
> {code}
> It would be useful if the method =Filter.bits()= returned an abstract interface, instead
of =java.util.BitSet=.
> Use case: there is a very large index, and, depending on the user's privileges, only
a small portion of the index is actually visible.
> Sparsely populated =java.util.BitSet=s are not efficient and waste lots of memory. It
would be desirable to have an alternative BitSet implementation with smaller memory footprint.
> Though it _is_ possibly to derive classes from =java.util.BitSet=, it was obviously not
designed for that purpose.
> That's why I propose to use an interface instead. The default implementation could still
delegate to =java.util.BitSet=.

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