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https://issues.apache.org/jira/browse/LUCENE-5092?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand updated LUCENE-5092:
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Description:
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.
was:
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 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.
> 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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