private static boolean fastIsAscii(byte[] blob) {
        for (byte b : blob) {
            if ((b & ~0x7f) != 0) {
                return false;
            }
        }
        return true;
    }
Label to use when a BLOB column cannot be converted to a string.
pandora-core/src/main/java/tech/linjiang/pandora/database/DatabaseResult.java