code: private static RTreeIndexCoreExtension getRTreeIndexExtension(
  			GeoPackageCore geoPackage) {
  		return new RTreeIndexCoreExtension(geoPackage) {
  			@Override
  			public void createMinYFunction() {
  			}
  
  			@Override
  			public void createMinXFunction() {
  			}
  
  			@Override
  			public void createMaxYFunction() {
  			}
  
  			@Override
  			public void createMaxXFunction() {
  			}
  
  			@Override
  			public void createIsEmptyFunction() {
  			}
  		};
  	}
docs: Get a RTree Index Extension used only for deletions
  
  @param geoPackage
  GeoPackage
  @return RTree index extension