[Fix-6273] Flush the potential duplicated message when add messages to a batch. #6326
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Fixes #6273
Motivation
The main reason for #6273 is combining potential duplicated messages and non-duplicated messages into a batch. So need to flush the potential duplicated message first and then add the non-duplicated messages to a batch.
Modifications
Describe the modifications you've done.
Verifying this change
Improve the exists unit test to cover the change.
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