public Builder clearUint64Type() {
        bitField0_ = (bitField0_ & ~0x00000020);
        uint64Type_ = 0L;
        onChanged();
        return this;
      }
<code>optional uint64 uint64Type = 6;</code>
@return This builder for chaining.
ql/src/gen/protobuf/gen-test/org/apache/hadoop/hive/ql/io/protobuf/SampleProtos.java