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https://issues.apache.org/jira/browse/LUCENE-5767?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand updated LUCENE-5767:
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Attachment: LUCENE-5767.patch
Here is a patch.
> 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
>
> Attachments: LUCENE-5767.patch
>
>
> 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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