presto-geospatial/src/main/java/io/prestosql/plugin/geospatial/GeoPlugin.java/GeoPlugin/getFunctions
class GeoPlugin:    @Override
    public Set<Class<?>> getFunctions()
    {
        return ImmutableSet.<Class<?>>builder()
                .add(GeoFunctions.class)
                .add(BingTileOperators.class)
                .add(BingTileFunctions.class)
                .add(BingTileCoordinatesFunction.class)
                .add(ConvexHullAggregation.class)
                .add(GeometryUnionAgg.class)
                .add(KdbTreeCasts.class)
                .add(EncodedPolylineFunctions.class)
                .add(SpatialPartitioningAggregateFunction.class)
                .add(SpatialPartitioningInternalAggregateFunction.class)
                .build();
    }