presto-main/src/main/java/io/prestosql/metadata/InternalBlockEncodingSerde.java/InternalBlockEncodingSerde/readLengthPrefixedString
class InternalBlockEncodingSerde:    private static String readLengthPrefixedString(SliceInput input)
    {
        int length = input.readInt();
        byte[] bytes = new byte[length];
        input.readBytes(bytes);
        return new String(bytes, UTF_8);
    }