public void compressToHere(File input) throws CompressException {
        String pathToFile = input.getAbsolutePath();
        File output = new File(pathToFile);
        this.compressTo(input, output);
    }
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