public static ConstantPropagateGroupByProc getGroupByProc() {
    return new ConstantPropagateGroupByProc();
  }
Factory method to get the ConstantPropagateGroupByProc class.

@return ConstantPropagateGroupByProc
ql/src/java/org/apache/hadoop/hive/ql/optimizer/ConstantPropagateProcFactory.java