[LUCENE-5092] join: don't expect all filters to be FixedBitSet instances

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Duplicate
• Component/s: modules/join
• Lucene Fields: New
• Assignee: Adrien Grand
• Reporter: Adrien Grand
• Created: 04/Jul/13 14:51
• Updated: 25/May/15 12:34
• Resolved: 30/Oct/14 16:14

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.

Issue Links

• duplicates: LUCENE-6025 Add BitSet.prevSetBit