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  1. insert channel
    1. DDL msg (CreateCollection/DropCollection/CreatePartition/DropPartition)
    2. InsertMsg
    3. DeleteMsg
  2. search channel
    1. SearchMsg
    2. RetrieveMsg

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QueryNode consumes messages from both insert channel and search channel.

To support delete, we will send DeleteMsg into insert channel also.


Since Milvus's storage is an append-only, `delete` function is implemented using soft delete, setting a flag on entity to indicate this entity has been deleted.

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