public Builder clearTimestamp() {
        bitField0_ = (bitField0_ & ~0x00000004);
        timestamp_ = 0L;
        onChanged();
        return this;
      }
<code>optional int64 timestamp = 3;</code>
@return This builder for chaining.
ql/src/gen/protobuf/gen-java/org/apache/hadoop/hive/ql/hooks/proto/HiveHookEvents.java