BewareMyPower opened a new issue, #489:
URL: https://github.com/apache/pulsar-client-cpp/issues/489
Currently the producer cannot send a null value message, which is used as a
tombstone for a specific key on a compacted topic.
In addition, the consumer cannot differ empty values from null values,
because all these values are presented as empty `std::string`s.
To solve this issue, we might need to add the following method to
`MessageBuilder`:
```c++
MessageBuilder& setNullValue();
```
The method above should set the following field in `MessageMetadata`:
```proto
message MessageMetadata {
// ...
// Indicate if the message payload value is set
optional bool null_value = 25 [default = false]
```
Then we can add a method to `Message` to indicate if the message has null
value
```c++
bool isNullValue() const;
```
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