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https://issues.apache.org/jira/browse/LUCENE-5979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14155466#comment-14155466
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Adrien Grand commented on LUCENE-5979:
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bq. I just am worried about 'crappy' implementations though, like FixedBitSet.
Must that one really implement DocIDSet?
LUCENE-5938 makes sure to not use FixedBitSet when the doc ids to store are
sparse. I think the only last bad guys are ChainedFilter (which I proposed to
remove) and BooleanFilter (that could be fixed). So I don't think this should
be a blocker for this issue?
> Use the cost API instead of a heuristic on the first document in
> FilteredQuery to decide on whether to use random access
> ------------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-5979
> URL: https://issues.apache.org/jira/browse/LUCENE-5979
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Fix For: 5.0
>
> Attachments: LUCENE-5979.patch
>
>
> Now that some major filters such as TermsFilter and
> MultiTermQueryWrapperFilter return DocIdSets that have a better cost, we
> should switch to the cost API.
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