Shai Erera created LUCENE-4609:
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Summary: Writer a PackedIntsEncoder/Decoder for facets
Key: LUCENE-4609
URL: https://issues.apache.org/jira/browse/LUCENE-4609
Project: Lucene - Core
Issue Type: New Feature
Components: modules/facet
Reporter: Shai Erera
Priority: Minor
Today the facets API lets you write IntEncoder/Decoder to encode/decode the
category ordinals. We have several such encoders, including VInt (default), and
block encoders.
It would be interesting to implement and benchmark a PackedIntsEncoder/Decoder,
with potentially two variants: (1) receives bitsPerValue up front, when you
e.g. know that you have a small taxonomy and the max value you can see and (2)
one that decides for each doc on the optimal bitsPerValue, writes it as a
header in the byte[] or something.
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