private void lazyDecompress() throws IOException {
    if (bytes == null && lazyDecompressObj != null) {
      bytes = lazyDecompressObj.decompress();
    }
  }
Create a BytesRefWritable referenced to one section of the given bytes. The
argument <pre>lazyDecompressData</pre> refers to a LazyDecompressionCallback
object. The arguments <pre>offset</pre> and <pre>len</pre> are referred to
uncompressed bytes of <pre>lazyDecompressData</pre>. Use <pre>offset</pre> and
<pre>len</pre> after uncompressing the data.
serde/src/java/org/apache/hadoop/hive/serde2/columnar/BytesRefWritable.java