[jira] [Created] (LUCENE-7994) Use int/int hash map for int taxonomy facet counts

["Michael McCandless (JIRA)" <ji...@apache.org>]

Michael McCandless created LUCENE-7994:
------------------------------------------

             Summary: Use int/int hash map for int taxonomy facet counts
                 Key: LUCENE-7994
                 URL: https://issues.apache.org/jira/browse/LUCENE-7994
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Michael McCandless
            Assignee: Michael McCandless
             Fix For: master (8.0), 7.2


Int taxonomy facets today always count into a dense {{int[]}}, which is wasteful in cases where the number of unique facet labels is high and the size of the current result set is small.

I factored the native hash map from LUCENE-7927 and use a simple heuristic (customizable by the user by subclassing) to decide up front whether to count sparse or dense.  I also made loading of the large children and siblings {{int[]}} lazy, so that they are only instantiated if you really need them.



--
This message was sent by Atlassian JIRA
(v6.4.14#64029)

---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscribe@lucene.apache.org
For additional commands, e-mail: dev-help@lucene.apache.org