Robert Muir created LUCENE-7123:
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Summary: deduplicate/cleanup spatial distance
Key: LUCENE-7123
URL: https://issues.apache.org/jira/browse/LUCENE-7123
Project: Lucene - Core
Issue Type: Bug
Reporter: Robert Muir
Currently there is a bit of a mess here: SloppyMath.haversin is slightly
different from GeoDistanceUtils.haversin, the latter is actually slightly
faster and uses a simple fixed earth diameter (which makes calculations easier
too).
But one of these returns meters, the other kilometers. Furthermore
lucene/spatial now uses some sin/tan functions that were added to sloppymath
with some accuracy guarantees (which are untested, and not quite correct).
Lucene/spatial queries also inconsistently mix the two different functions
together for various purposes and this just causes headaches. Its tests did
this recently too.
We need to clean this up, otherwise users will be confused. E.G. they will see
different results from expressions than from queries and not understand.
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