@Override
      public void apply(Operator<?> argument) {
        if (argument.getNumParent() == 0 && (clazz == null || clazz.isInstance(argument))) {
          operators.add(argument);
        }
      }
Skip temporary file generation for:
1. MM Tables
2. INSERT operation on full ACID table
ql/src/java/org/apache/hadoop/hive/ql/optimizer/GenMapRedUtils.java