Ignacio Vera created LUCENE-9139:
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Summary: TestXYMultiPolygonShapeQueries test failures
Key: LUCENE-9139
URL: https://issues.apache.org/jira/browse/LUCENE-9139
Project: Lucene - Core
Issue Type: Test
Reporter: Ignacio Vera
We recently have two failures on CI from the test method
TestXYMultiPolygonShapeQueries. The reproduction lines are:
{code:java}
ant test -Dtestcase=TestXYMultiPolygonShapeQueries
-Dtests.method=testRandomMedium -Dtests.seed=F1E142C2FBB612AF
-Dtests.multiplier=3 -Dtests.slow=true -Dtests.badapples=true -Dtests.locale=el
-Dtests.timezone=EST5EDT -Dtests.asserts=true
-Dtests.file.encoding=US-ASCII{code}
{code:java}
ant test -Dtestcase=TestXYMultiPolygonShapeQueries
-Dtests.method=testRandomMedium -Dtests.seed=363603A0428EC788
-Dtests.multiplier=3 -Dtests.slow=true -Dtests.badapples=true
-Dtests.locale=sv-SE -Dtests.timezone=America/Yakutat -Dtests.asserts=true
-Dtests.file.encoding=UTF-8{code}
I dug into the failures and there seem to be due to numerical errors in the
GeoUtils.orient method. The method is detecting intersections of two very long
lines when it shouldn't. For example:
Line 1:
{code:java}
double ax = 3.031820875100829E38;
double ay = -4.85205639507213E37;
double bx = 3.4028234663852886E38;
double by = 3.078656764620797E21; {code}
Line 2:
{code:java}
double cx = 1.5099193697126732E-26;
double cy = 0.0;
double dx = 3.4028234663852886E38;
double dy = 0.0;{code}
My proposal to prevent those numerical errors is to modify the shape generator
to prevent creating shapes that expands more than half the float space.
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