[LUCENE-4600] Explore facets aggregation during documents collection

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.2, 6.0
• Component/s: modules/facet
• Lucene Fields: New, Patch Available
• Assignee: Shai Erera
• Reporter: Michael McCandless
• Created: 07/Dec/12 18:37
• Updated: 28/Aug/22 13:33
• Resolved: 21/Jan/13 16:22

Description

Today the facet module simply gathers all hits (as a bitset, optionally with a float[] to hold scores as well, if you will aggregate them) during collection, and then at the end when you call getFacetsResults(), it makes a 2nd pass over all those hits doing the actual aggregation.

We should investigate just aggregating as we collect instead, so we don't have to tie up transient RAM (fairly small for the bit set but possibly big for the float[]).

Issue Links

• contains: LUCENE-4619 Create a specialized path for facets counting