public void deriveExplainAttributes() {
    if (pathToPartitionInfo != null) {
      for (Map.Entry<Path, PartitionDesc> entry : pathToPartitionInfo.entrySet()) {
        entry.getValue().deriveBaseFileName(entry.getKey());
      }
    }
    MapredLocalWork mapLocalWork = getMapRedLocalWork();
    if (mapLocalWork != null) {
      mapLocalWork.deriveExplainAttributes();
    }
  }
Derive additional attributes to be rendered by EXPLAIN.
TODO: this method is relied upon by custom input formats to set jobconf properties.
      This is madness? - This is Hive Storage Handlers!
ql/src/java/org/apache/hadoop/hive/ql/plan/MapWork.java