Michael McCandless created LUCENE-7994:
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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.
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