@Override
  @Explain(displayName = "Statistics Aggregation Key Prefix", explainLevels = { Level.EXTENDED })
  public String getStatsAggPrefix() {
    return statsAggKeyPrefix;
  }
A boolean variable set to true by the semantic analyzer only in case of the analyze command.
ql/src/java/org/apache/hadoop/hive/ql/plan/TableScanDesc.java