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https://issues.apache.org/jira/browse/LUCENE-7563?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless updated LUCENE-7563:
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Attachment: LUCENE-7563.patch
New patch, folding in [~jpountz]'s first idea. I like the second idea
... I'll try that next.
I tested on LatLonPoint and Geo3D with the ~60M document
OpenStreetMaps geo benchmark and it reduces heap usage from from 2.29
MB -> 1.79 (Geo3D) and 2.29 -> 1.77 (LatLonPoint), ~22% smaller.
> BKD index should compress unused leading bytes
> ----------------------------------------------
>
> Key: LUCENE-7563
> URL: https://issues.apache.org/jira/browse/LUCENE-7563
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Fix For: master (7.0), 6.4
>
> Attachments: LUCENE-7563.patch, LUCENE-7563.patch, LUCENE-7563.patch
>
>
> Today the BKD (points) in-heap index always uses {{dimensionNumBytes}} per
> dimension, but if e.g. you are indexing {{LongPoint}} yet only use the bottom
> two bytes in a given segment, we shouldn't store all those leading 0s in the
> index.
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