[ http://issues.apache.org/jira/browse/LUCENE-606?page=all ]
Christian Kohlschuetter updated LUCENE-606:
-------------------------------------------
Attachment: patch-allfields.diff
Patch to ParallelReader. Implementation of the proposed parameter.
> Change behavior of ParallelReader.document(int)
> -----------------------------------------------
>
> Key: LUCENE-606
> URL: http://issues.apache.org/jira/browse/LUCENE-606
> Project: Lucene - Java
> Type: Improvement
> Components: Index
> Versions: 2.0.0
> Reporter: Christian Kohlschuetter
> Attachments: ParallelReaderTest2.java, patch-allfields.diff
>
> Currently, the returned documents contain, for each field, the stored data
> from all enclosed IndexReaders which contain the corresponding field.
> That is, a call to ParallelReader.document(doc).getFields(fieldName) returns
> an array of possibly several Field objects. Since null entries are
> disallowed, there is no way to determine to which IndexReader the field data
> exactly belongs.
> On the other side, a search for a term on that field only yields results if
> that term was contained in the *first* matching IndexReader which contained
> the field.
> Thus, when merging the ParallelReader contents to another IndexWriter, the
> indexed data does not correspond to the stored information.
> I am not sure whether this can be considered a bug (in some cases, this may
> exactly be required). However I would like to see an option to change this
> behaviour.
> I suggest a parameter for ParallelReader which specifies whether stored data
> from all IndexReaders or only from the one which is repsonsible for the
> field's indexed data will be returned by ParallelReader.document(int).
> Please find my proposed implementation attached, as well as a JUnit testcase.
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