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https://issues.apache.org/jira/browse/ARROW-1860?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Panchen Xue updated ARROW-1860:
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Description: 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 (was: {color:red}colored
text{color}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)
> [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: Panchen Xue
> 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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