Yonik Seeley created SOLR-11806:
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Summary: Use indirection for hash-based faceting
Key: SOLR-11806
URL: https://issues.apache.org/jira/browse/SOLR-11806
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Components: Facet Module
Reporter: Yonik Seeley
Currently when hashing is used during faceting (FacetFieldProcessorByHashDV),
all SlotAcc instances act as hash tables. They are directly accessed by hash,
and when the hash table needs to be resized, all SlotAcc instances are
rehashed. This is good when a single statistic is being used, but wasteful
when multiple statistics are being calculated per bucket.
An alternative would be for the hash table to hash to a persistent slot
(starting at 0 and incremented for each new bucket encountered). All of the
SlotAcc instances would then be dense and be indexed by the persistent slot.
This would also allow more efficient implementations of some metrics using
hashes themselves (made easier since slots no longer change and can thus be
part of a hash).
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