[Bug] TableView's existing value will never update

[BewareMyPower]

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• [x] I searched in the issues and found nothing similar.

Version

TableView uses SynchronizedHashMap#emplace to update a key-value:

https://github.com/apache/pulsar-client-cpp/blob/0e1ed3b2af24f5373036b839e4131257e8e75bf2/lib/TableViewImpl.cc#L107

https://github.com/apache/pulsar-client-cpp/blob/0e1ed3b2af24f5373036b839e4131257e8e75bf2/lib/SynchronizedHashMap.h#L58

However, the underlying emplace method does not update an existing key-value.

Minimal reproduce step

TBD

What did you expect to see?

TBD

What did you see instead?

TBD

Anything else?

No response

Are you willing to submit a PR?

• [x] I'm willing to submit a PR!