@Explain(displayName = "probeDecodeDetails", explainLevels = { Level.DEFAULT, Level.EXTENDED })
  public String getProbeDecodeString() {
    if (probeDecodeContext == null) {
      return null;
    }
    return probeDecodeContext.toString();
  }
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