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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-7160) LatLonPoint quantization should use same rounding mode as GeoPointField
Date Fri, 01 Apr 2016 06:14:25 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-7160?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Muir updated LUCENE-7160:
--------------------------------
    Attachment: LUCENE-7160.patch

Here's a patch. I think its a first step towards e.g. removing test leniency, testing and
fixing edge cases to at least be consistent.


> LatLonPoint quantization should use same rounding mode as GeoPointField
> -----------------------------------------------------------------------
>
>                 Key: LUCENE-7160
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7160
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Robert Muir
>         Attachments: LUCENE-7160.patch
>
>
> Both of these fields quantize doubles in a lossy way, but GeoPoint rounds towards negative
infinity (because all values get shifted to positive space first), whereas LatLonPoint currently
rounds towards zero.
> At the same time they share the same basic logic for e.g. tree traversal and same basic
tests: so it creates confusion that they round differently.
> Especially since e.g. LatLonPoint does some operations in binary/integer space (some
of these optimizations such as its box query are currently buggy for edge cases, and tests
are lenient as TODO, another issue, may or may not impact GeoPoint, it at least tries harder).
> I think LatLonPoint should round down to be more like GeoPoint here? By the way, doing
this also gives more consistency, it reduces the difference between the two implementations
in e.g. openstreetmaps searching (distance query benchmark now differs by only 4 hits...)
> This quantization makes things complicated to reason about. I understand the advantages
it brings but I think along with that comes the responsibility of us handling edge cases better.
I don't think we do well at this today...



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