John Wang created LUCENE-5428:
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Summary: Make Faceting counting array overridable
Key: LUCENE-5428
URL: https://issues.apache.org/jira/browse/LUCENE-5428
Project: Lucene - Core
Issue Type: Improvement
Components: modules/facet
Affects Versions: 4.6.1
Reporter: John Wang
Attachments: facetcounter.patch
In SortedSetDocValuesFacetCounts, the count array is allocated as an int[] size
of number of total values across all facets and that is allocated per query.
In the case where number of values are large, large amount of garbage maybe
created. Furthermore, the size of the array is dependent on the number of
possible values, not number of number values needed for which facets fields are
being accumulated for. E.g. if FacetSearchParam indicates counting only one 1
field with 2 values, we are still creating the array for all values across all
fields.
This patch makes the count array abstract to allow for
1) caching
2) hash counting - which can choose to count only of needed fields.
This patch can be further enhanced to create FacetCouter per segment, per field
by pass in the ordinal map.
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