public InputStream decompress(File input) throws CompressException {
        File temp = null;
        InputStream result = null;
        try {
            temp = File.createTempFile("compress_", "jkt");
            this.decompressTo(input, temp);
            result = new FileInputStream(temp);
        } catch (IOException e) {
            throw new CompressException("Error while creating a temporary file", e);
        }

        return result;
    }
Returns a String with the default file extension for this compressor. For example, a zip-files default file
extension would be "zip" (without leading dot).

@return the default file extension
node/etl/src/main/java/com/alibaba/otter/node/etl/common/io/compress/impl/AbstractCompressor.java