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Adrien Grand commented on LUCENE-5092: -------------------------------------- bq. I dont think we should add backwards iteration to DocIDSetIterator etc. This is not really how search engines work, its just an oddity of join. In that case, a simple fix would just be to dump the content into a FixedBitSet every time we get something else. bq. In general I am not happy with the backwards iteration at all. 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? > 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org