@Override
      public void close(boolean abort) throws IOException {
        outStream.close();
      }
create the final out file, and output an empty key as the key.

@param jc
         the job configuration file
@param finalOutPath
         the final output file to be created
@param valueClass
         the value class used for create
@param isCompressed
         whether the content is compressed or not
@param tableProperties
         the tableInfo of this file's corresponding table
@param progress
         progress used for status report
@return the RecordWriter for the output file
ql/src/java/org/apache/hadoop/hive/ql/io/HiveSequenceFileOutputFormat.java