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https://issues.apache.org/jira/browse/SOLR-875?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Busch updated SOLR-875:
-------------------------------

    Attachment: solr-875.patch

This patch:
- deprecates OpenBitSet, BitUtil and BitSetIterator in org.apache.solr.util 
- updates all places in Solr's core that reference these classes to use the 
ones in Lucene

All tests pass and this patch is backwards-compatible. 
Note that this patch only compiles against the current Lucene trunk + 
LUCENE-1467. 

> Consolidate Solr's and Lucene's OpenBitSet classes
> --------------------------------------------------
>
>                 Key: SOLR-875
>                 URL: https://issues.apache.org/jira/browse/SOLR-875
>             Project: Solr
>          Issue Type: Task
>            Reporter: Michael Busch
>            Priority: Minor
>         Attachments: solr-875.patch
>
>
> Currently there are two versions of OpenBitSet and BitUtil in Solr and Lucene.
> We should only have one version of these classes in Lucene, that Solr should 
> use.
> Tasks here:
> - Merge different versions into Lucene
> - Make Solr classes use/extend the classes in Lucene (we need to keep the 
> Solr ones for backwards-compatibility)
> - Deprecate the classes in Solr
> - Change all references in Solr to use the classes in Lucene
> One difficulty here is Solr's BitSetIterator vs. Lucene's OpenBitSetIterator. 
> Both have a next() method, however one returns an int (BitSetIterator), the 
> other one returns a boolean and offers a doc() method to get the doc id. So I 
> can't make BitSetIterator extend OpenBitSetIterator. There are not many 
> places in Solr's core that use BitSetIterator, so we could simply change e.g. 
> search/BitDocSet.java to use OpenBitSetIterator. This would however require 
> to change the call to next() into two calls to next() and doc(). I wonder if 
> this would be a noticeable performance hit?
> We could of course also leave both iterators and only merge OpenBitSet and 
> BitUtil, but I'd prefer to only have one iterator, because they basically do 
> exactly the same.

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