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https://issues.apache.org/jira/browse/ARROW-16703?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated ARROW-16703:
-----------------------------------
Labels: pull-request-available (was: )
> [R] Refactor map_batches() so it can stream results
> ---------------------------------------------------
>
> Key: ARROW-16703
> URL: https://issues.apache.org/jira/browse/ARROW-16703
> Project: Apache Arrow
> Issue Type: Improvement
> Components: R
> Affects Versions: 8.0.0
> Reporter: Will Jones
> Priority: Major
> Labels: pull-request-available
> Fix For: 10.0.0
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> As part of ARROW-15271, {{map_batches()}} was modified to return a
> {{RecordBatchReader}}, but the implementation collects all results as a list
> of record batches and then converts that to a reader. In theory, if we push
> the implementation down to C++, we should be able to make a proper streaming
> RBR.
> We won't know the schema ahead of time. We could optionally accept it, which
> would allow the function to be lazy. Or we could eagerly evaluate just the
> first batch to determine the schema.
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