@Override
    void resetToken() {
      this.type = Type.NONE;
      this.nodeOfInterest = null;
    }
The context that doPhase1 uses to populate information pertaining to CBO
(currently, this is used for CTAS and insert-as-select).
ql/src/java/org/apache/hadoop/hive/ql/parse/CalcitePlanner.java