[LUCENE-7563] BKD index should compress unused leading bytes

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 6.4, 7.0
• Lucene Fields: New
• Assignee: Unassigned
• Reporter: Michael McCandless
• Created: 15/Nov/16 17:06
• Updated: 28/Aug/22 15:06
• Resolved: 07/Dec/16 13:48

Description

Today the BKD (points) in-heap index always uses dimensionNumBytes per dimension, but if e.g. you are indexing LongPoint yet only use the bottom two bytes in a given segment, we shouldn't store all those leading 0s in the index.