@Explain(displayName = "Split Sample", explainLevels = { Level.EXTENDED })
  public Map<String, SplitSample> getNameToSplitSample() {
    return nameToSplitSample;
  }
@param aliasToPartnInfo
         the aliasToPartnInfo to set
ql/src/java/org/apache/hadoop/hive/ql/plan/MapWork.java