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https://issues.apache.org/jira/browse/LUCENE-7312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15313579#comment-15313579
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Karl Wright commented on LUCENE-7312:
-------------------------------------
Hmm, looking at what I did for Geo3DDocValuesField, and trying to see whether
it would suffer from the same issue, it looks like I did something somewhat
different:
{code}
private static int encodeX(final double x) {
if (x > PlanetModel.WGS84.getMaximumXValue()) {
throw new IllegalArgumentException("x value exceeds WGS84 maximum");
} else if (x < PlanetModel.WGS84.getMinimumXValue()) {
throw new IllegalArgumentException("x value less than WGS84 minimum");
}
return (int)Math.floor((x - PlanetModel.WGS84.getMinimumXValue()) * xFactor
+ 0.5);
}
private static double decodeX(final int x) {
return x * inverseXFactor + PlanetModel.WGS84.getMinimumXValue();
}
{code}
... where xFactor and inverseXFactor are related such that inverseXFactor =
1.0/xFactor. Basically, by adding the 0.5 right before floor time I made sure
no such effects could happen? I think?? This stuff makes my head hurt...
> Geo3dPoint test failure
> -----------------------
>
> Key: LUCENE-7312
> URL: https://issues.apache.org/jira/browse/LUCENE-7312
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/spatial3d
> Affects Versions: master (7.0)
> Reporter: Karl Wright
> Assignee: Karl Wright
> Attachments: LUCENE-7312.patch
>
>
> Here's the failure:
> {code}
> ant test -Dtestcase=TestGeo3DPoint -Dtests.method=testEncodeDecodeRoundsDown
> -Dtests.seed=7046405B94C1716E -Dtests.multiplier=3 -Dtests.slow=true
> -Dtests.locale=da-DK -Dtests.timezone=America/Detroit -Dtests.asserts=true
> -Dtests.file.encoding=UTF-8
> {code}
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