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From "Christian Kohlschuetter (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-606) Change behavior of ParallelReader.document(int)
Date Mon, 19 Jun 2006 12:12:37 GMT
     [ http://issues.apache.org/jira/browse/LUCENE-606?page=all ]

Christian Kohlschuetter updated LUCENE-606:
-------------------------------------------

    Attachment: ParallelReaderTest2.java

Testcase demonstrating the new feature.


> 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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