Adrien Grand created LUCENE-5767:
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Summary: OrdinalMap optimizations
Key: LUCENE-5767
URL: https://issues.apache.org/jira/browse/LUCENE-5767
Project: Lucene - Core
Issue Type: Improvement
Reporter: Adrien Grand
Assignee: Adrien Grand
Priority: Minor
Fix For: 4.9, 5.0
OrdinalMap does its best to store a mapping from segment to global ordinals
with as little memory as possible using {{MonotonicAppendingLongBuffer}}. In
the low-cardinality case, there are things that could be optimized though:
- on large segments, it's quite likely that the segment ordinals will
perfectly match the global ordinals. In that case there is nothing to do, we
can just return the segment ordinal as-is.
- even if they don't, it might be that storing the global ordinals directly in
a PackedInts.Mutable only takes slightly more memory while removing the
overhead of the monotonic encoding.
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