Note: migrated from original JIRA: https://issues.apache.org/jira/browse/ARROW-11696

I have the IPC format of Arrow record batches in memory (e.g. as {{&[u8]}}) and would like to create a vector of batches while avoiding as many memory copies as possible. It would be great if there was a way to create the vector without having to go through the file abstraction.

I might be misunderstanding the way the file reader works and maybe it does not incur memory copies. I think it does, though, since creating arrow record batches from a larger arrow buffer takes much longer.