presto-geospatial/src/main/java/io/prestosql/plugin/geospatial/BingTileFunctions.java/BingTileFunctions/checkQuadKey
class BingTileFunctions:    private static void checkQuadKey(@SqlType(StandardTypes.VARCHAR) Slice quadkey)
    {
        checkCondition(quadkey.length() > 0, QUAD_KEY_EMPTY);
        checkCondition(quadkey.length() <= MAX_ZOOM_LEVEL, QUAD_KEY_TOO_LONG);
    }