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

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-1860?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16361514#comment-16361514 ] 

ASF GitHub Bot commented on ARROW-1860:
---------------------------------------

wesm commented on issue #1500: ARROW-1860: [C++] Introduce ipc::PreparedMessage data structure to avoid making multiple passes over record batches
URL: https://github.com/apache/arrow/pull/1500#issuecomment-365077357
 
 
   Picking this up again

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> [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
>            Assignee: Wes McKinney
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 0.9.0
>
>         Attachments: text.html
>
>
> 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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