public void setInputFileFormatClass(
      final Class<? extends InputFormat> inputFileFormatClass) {
    if (inputFileFormatClass == null) {
      this.inputFileFormatClass = null;
    } else {
      this.inputFileFormatClass = (Class<? extends InputFormat>) CLASS_INTERNER.intern(inputFileFormatClass);
    }
  }
Return a deserializer object corresponding to the partitionDesc.
ql/src/java/org/apache/hadoop/hive/ql/plan/PartitionDesc.java