JVM crash on large polyfills

Inizia riproducendo il crash con il caso di polyfill grande in TestH3Core.java, quindi confrontalo con il caso correlato testPolyfill.c e con la chiamata h3Api.polyfill. Determina se il problema si trova nel wrapper Java o nella libreria core e conferma la correzione completata con una copertura di regressione per il poligono grande.

When the following is added to TestH3Core.java, the jvm crashes out on h3Api.polyfill before completing the tests. The polyfill works at resolution 9.

    @Test
    public void testPolyfillLarge() {
        List<Long> hexagons = h3.polyfill(
                ImmutableList.<GeoCoord>of(
                        new GeoCoord(41.5, -70.4),
                        new GeoCoord(41.5, -69.8),
                        new GeoCoord(42.1, -69.8),
                        new GeoCoord(42.1, -70.4)
                ), null,
                10
        );

        assertTrue(hexagons.size() > 1000);
    }

Is this an issue with the java wrapper, or is this impossible to do with the core library?

I don't know C but adding a similar test to h3 naively copying the existing styles to testPolyfill.c at level 11 still seems to work. If I increase the resolution up past 11 it eventually segfaults there too.

GeoCoord capeCodVerts[] = {
        {0.7243116395776468, -1.2287117934040082},  {0.7243116395776468, -1.218239817892042},
        {0.7347836150896128, -1.218239817892042}, {0.7347836150896128, -1.2287117934040082}};
Geofence capeCodGeofence;
GeoPolygon capeCodGeoPolygon;

capeCodGeofence.numVerts = 4;
capeCodGeofence.verts = capeCodVerts;
capeCodGeoPolygon.geofence = capeCodGeofence;
capeCodGeoPolygon.numHoles = 0;

TEST(polyfillLarge) {
    int numHexagons = H3_EXPORT(maxPolyfillSize)(&capeCodGeoPolygon, 12);
    H3Index* hexagons = calloc(numHexagons, sizeof(H3Index));

    H3_EXPORT(polyfill)(&capeCodGeoPolygon, 11, hexagons);
    int actualNumHexagons = 0;
    for (int i = 0; i < numHexagons; i++) {
        if (hexagons[i] != 0) {
            actualNumHexagons++;
        }
    }
    
    t_assert(actualNumHexagons > 10000, "got lots of hexagons");
    free(hexagons);
}