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https://issues.apache.org/jira/browse/LUCENE-5092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13700231#comment-13700231
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Robert Muir commented on LUCENE-5092:
-------------------------------------
{quote}
Since the actual problem looks like we require random-access on top of an API
which only supports random-access optionally, this makes me wonder whether we
could support the same functionality on top of NumericDocValues instead of
filters?
{quote}
Cool idea :) I've always been a little frustrated that parent/child docs aren't
recorded in the index: so tools like splitters, sorters, or
sorting-merge-policies cant avoid splitting nested documents in half by default.
Would be even better if numericDV was updatable (copy-on-write generation in
the commit like deleted docs/old setNorm), and deleted docs were then
implemented as DV... I guess if we go this route we should probably think if
its worth being numericDV or a specialized bitsetDV type. I hate flooding the
API with "unnecessary" types though...
> join: don't expect all filters to be FixedBitSet instances
> ----------------------------------------------------------
>
> Key: LUCENE-5092
> URL: https://issues.apache.org/jira/browse/LUCENE-5092
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/join
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
>
> The join module throws exceptions when the parents filter isn't a
> FixedBitSet. The reason is that the join module relies on prevSetBit to find
> the first child document given a parent ID.
> As suggested by Uwe and Paul Elschot on LUCENE-5081, we could fix it by
> exposing methods in the iterators to iterate backwards. When the join modules
> gets an iterator which isn't able to iterate backwards, it would just need to
> dump its content into another DocIdSet that supports backward iteration,
> FixedBitSet for example.
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