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From chrisbamford <>
Subject RE: Filtering question
Date Mon, 16 Mar 2015 13:27:11 GMT
Hi Uwe

I was just composing an email to you, so here it is!

> You just have to implement the "protected boolean matchDoc(int
> docId)" method. You should return this DocIdSet from your filter
> instead of the manual code you created.
Yes, I tried that, see below ...

Sorry about earlier, I did manage to find FieldCacheDocIdSet in 4.10.2.

I have to confess that I'm getting a bit confused now with the long 
email trail!
So this is what I have now implemented, but I still get no acceptDocs 
coming into my filter, I guess I am still missing something fundamental:

Firstly I have created a simple filter which just reports on what it is 
passed (note that I am using AtomicReaderContext as that is what other 
4.10 filters seem to use - is this correct?):

public class MyBinaryDocValuesFilter extends Filter {
     private String fieldName;
     private String matchTag;

     public MyBinaryDocValuesFilter(Term term) {
         this.fieldName = term.field();
         this.matchTag = term.text();

     public DocIdSet getDocIdSet(AtomicReaderContext context, Bits 
acceptDocs) throws IOException {

         System.out.println("MyBinaryDocValuesFilter: acceptDocs is "
                + ((acceptDocs == null) ? "NULL" : "ALIVE!!"));

         return new FieldCacheDocIdSet(context.reader().maxDoc(), 
acceptDocs) {
             protected final boolean matchDoc(int doc) {
                 System.out.println("MyBinaryDocValuesFilter>> " + doc);
                 return false;

As it stands, getDocIdSet() is reporting acceptDocs=NULL and matchDoc() 
is being passed all 30 docs  :-(

The query / filter now looks like this:

     private int doQuery(Directory dir, Term term) throws Exception {

         DirectoryReader reader =;

         Filter myBDVTagFilter = new CachingWrapperFilter(new 
         Query myBDVTagQuery = new ConstantScoreQuery(myNDVTagFilter);

         BooleanQuery booleanQuery = new BooleanQuery();
         TermQuery tagsTermQuery = new TermQuery(term);
         booleanQuery.add(tagsTermQuery, BooleanClause.Occur.SHOULD);
         booleanQuery.add(myBDVTagQuery, BooleanClause.Occur.SHOULD);

         IndexSearcher searcher = new IndexSearcher(reader);
         Filter ownerFilter = new TermFilter(new Term("owner", 
         TopDocs td =, ownerFilter, 100);

         ScoreDoc[] sd = td.scoreDocs;
         for (int i=0; i < sd.length; i++) {
             Document hitDoc = searcher.doc(sd[i].doc);
             System.out.println("Hit: " + sd[i].doc + " : " + hitDoc);


         return sd.length;

I have also unsuccessfully tried using a BooleanFilter in place of 
ownerFilter (combination of
ownerFilter and allDocs, operator=MUST).

I think I must be close now ...


- Chris

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