Wes McKinney created ARROW-1214:
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             Summary: [Python] Add classes / functions to enable stream message 
components to be handled outside of the stream reader class
                 Key: ARROW-1214
                 URL: https://issues.apache.org/jira/browse/ARROW-1214
             Project: Apache Arrow
          Issue Type: New Feature
          Components: Python
            Reporter: Wes McKinney


This will be helpful in messaging / RPC scenarios where the message components 
are sent in multiple streams (e.g. schema negotation first, then record batches 
later)

* Class for holding a single serialized message, able to indicate what kind of 
message it is
* Read schema from list of one or more messages (if there are dictionaries, 
there will be multiple messages, otherwise only one)
* Read record batch from a message given the schema



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