Wes McKinney updated ARROW-5377:
    Fix Version/s: 1.0.0

> [C++] Develop interface for writing a RecordBatch IPC stream into 
> pre-allocated space (e.g. memory map) that avoids unnecessary serialization
> ---------------------------------------------------------------------------------------------------------------------------------------------
>                 Key: ARROW-5377
>                 URL: https://issues.apache.org/jira/browse/ARROW-5377
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Wes McKinney
>            Priority: Major
>             Fix For: 1.0.0
> As discussed in recent mailing list thread
> https://lists.apache.org/thread.html/b756209052fecb8c28a5eb37db7aecb82a5f5351fa79a9d86f0dba3e@%3Cuser.arrow.apache.org%3E
> The only viable process at the moment for getting an accurate report of 
> stream size is to write a simulated stream using {{MockOutputStream}}. This 
> is suboptimal for a couple of reasons:
> * Flatbuffers metadata must be created twice
> * Record batch disassembly into IpcPayload must be performed twice
> It seems like an interface with a very constrained public API could be 
> provided to deconstruct a sequence of RecordBatches and report the size of 
> the produced IPC stream (based on metadata sizes, and padding), and then this 
> deconstructed set of IPC payloads can be written out to a stream (e.g. using 
> {{FixedSizeBufferWriter}})

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