@Override
  public org.apache.hadoop.mapred.RecordWriter<ImmutableBytesWritable, Cell> getRecordWriter(
      FileSystem ignored, JobConf job, String name, Progressable progress) throws IOException {
    throw new NotImplementedException("This will not be invoked");
  }
Retrieve the family path, first check the JobConf, then the table properties.
@return the family path or null if not specified.
hbase-handler/src/java/org/apache/hadoop/hive/hbase/HiveHFileOutputFormat.java