[SOLR-8222] Optimize count-only faceting when there are many expected matches-per-ord

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 5.4
• Component/s: Facet Module
• Assignee: Yonik Seeley
• Reporter: Yonik Seeley
• Created: 29/Oct/15 16:27
• Updated: 15/Dec/15 13:55
• Resolved: 04/Nov/15 19:20

Description

This optimization for the JSON Facet API came up a few months ago on the mailing list (I think by Toke).
Basically, if one expects many hits per bucket, use a temporary array to accumulate segment ords and map them all at the end to global ords. This saves redundant segOrd->globalOrd mappings at the cost of having to scan the temp array.