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https://issues.apache.org/jira/browse/LUCENE-7179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15227028#comment-15227028
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Robert Muir commented on LUCENE-7179:
-------------------------------------
{quote}
Unless there's ideas for lossless compression of 64 bit signed double precision
to 32 bit unsigned space I'm not sure this discussion will be any more
productive.
{quote}
We don't need it to be lossless, just well-defined. If i were to try, my first
stab would be:
* Use same quantization methods as LatLonPoint to quantize each component from
a 64-bit double to a 32-bit integer.
* Run NumericUtils on each component so it sorts correctly.
* Interleave those and treat it in your head like its a unsigned 64-bit long.
> GeoPoint and LatLonPoint test data should quantize once
> -------------------------------------------------------
>
> Key: LUCENE-7179
> URL: https://issues.apache.org/jira/browse/LUCENE-7179
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Nicholas Knize
> Attachments: LUCENE-7179.patch
>
>
> {{LatLonPoint}} and {{GeoPointField}} tests pre quantizes test data to ensure
> consistency with indexed (encoded) data. The pre quantized data then becomes
> indexed, undergoing another quantization. To guarantee numerical stability
> this should be changed such that the test data is quantized after indexing.
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