[LUCENE-8687] Optimise radix partitioning for points on heap

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 8.x, master (9.0)
• Lucene Fields: New
• Assignee: Ignacio Vera
• Reporter: Ignacio Vera
• Created: 08/Feb/19 07:19
• Updated: 11/Feb/19 07:15
• Resolved: 11/Feb/19 07:14

Description

In LUCENE-8673 it was introduced radix partitioning for merging segments. It currently works the same when you have data offline and on-heap. It makes sense when data is on-heap, not to have multiple copies but perform the partitioning always in the same object, similar to what it is done with `MutablePointValues`.

This will allow to hold more points in memory as well because we don't have multiple copies of the same data as we recurse.

Issue Links

• links to: GitHub Pull Request #569