presto-rcfile/src/main/java/io/prestosql/rcfile/RcFileReader.java/Column/getDataBuffer
class Column:        private Slice getDataBuffer()
                throws IOException
        {
            if (compressed) {
                if (decompressedBuffer.length < uncompressedDataSize) {
                    decompressedBuffer = new byte[uncompressedDataSize];
                }
                Slice buffer = Slices.wrappedBuffer(decompressedBuffer, 0, uncompressedDataSize);

                decompressor.decompress(dataBuffer, buffer);

                dataBuffer = buffer;
                compressed = false;
            }
            return dataBuffer;
        }