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Posted to issues@arrow.apache.org by "Wes McKinney (JIRA)" <ji...@apache.org> on 2017/11/26 16:45:00 UTC

[jira] [Created] (ARROW-1860) [C++] Add data structure to "stage" a sequence of IPC messages from in-memory data

Wes McKinney created ARROW-1860:
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             Summary: [C++] Add data structure to "stage" a sequence of IPC messages from in-memory data
                 Key: ARROW-1860
                 URL: https://issues.apache.org/jira/browse/ARROW-1860
             Project: Apache Arrow
          Issue Type: New Feature
          Components: C++
            Reporter: Wes McKinney


Currently, when you need to pre-allocate space for a record batch or a stream (schema + dictionaries + record batches), you must make multiple passes over the data structures of interest (and use e.g. {{MockOutputStream}} to compute the size of the output buffer). It would be useful to make a single pass to "prepare" the IPC payload for both sizing and writing to prevent having to make multiple passes



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