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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-7179) GeoPoint and LatLonPoint test data should quantize once
Date Tue, 05 Apr 2016 19:49:25 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-7179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15226999#comment-15226999
] 

Robert Muir commented on LUCENE-7179:
-------------------------------------

{quote}
But if we don't want to handle the dimensional reduction limitations we can remove this approach
altogether. Noting that we haven't even begun to tap into its optimization potential.
{quote}

Right, I think we should try to improve it here to work the best it can in one dimensional
space. Working better on a z-order curve means doing work in integer space! I have an example
of what this looks like on LUCENE-7177. Look in the code for all my comments about the encoding
& rounding issues i worked around.

If we can reason well about the encoding and quantization, we can explore adapting that patch's
1D grid to work in the same z-order space, or other options, or we can stick with using rectangles.
Even if we stick with rectangles, in my opinion integers and byte[] are easier for many operations,
so its worth the trouble.


> 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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