public Builder clearEnumType() {
        bitField0_ = (bitField0_ & ~0x00080000);
        enumType_ = 1;
        onChanged();
        return this;
      }
<code>optional .AllTypes.Enum1 enumType = 20;</code>
@return This builder for chaining.
ql/src/gen/protobuf/gen-test/org/apache/hadoop/hive/ql/io/protobuf/SampleProtos.java