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https://issues.apache.org/jira/browse/LUCENE-606?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shai Erera closed LUCENE-606.
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Resolution: Won't Fix
Closing due to long inactivity, and also because I don't think it's a bug.
IndexReaders today expose a getSequentialSubReaders API which allows one to
fetch a Document's fields from whatever sub-reader they want. Also, the general
concept behind ParallelReader is that fields do not exist in more than 1
sub-reader.
> Change behavior of ParallelReader.document(int)
> -----------------------------------------------
>
> Key: LUCENE-606
> URL: https://issues.apache.org/jira/browse/LUCENE-606
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Affects Versions: 2.0.0
> Reporter: Christian Kohlschuetter
> Priority: Minor
> 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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