[jira] [Resolved] (ARROW-3842) [R] RecordBatchStreamWriter api

["Wes McKinney (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-3842?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wes McKinney resolved ARROW-3842.
---------------------------------
       Resolution: Fixed
    Fix Version/s: 0.12.0

Issue resolved by pull request 3043
[https://github.com/apache/arrow/pull/3043]

> [R] RecordBatchStreamWriter api
> -------------------------------
>
>                 Key: ARROW-3842
>                 URL: https://issues.apache.org/jira/browse/ARROW-3842
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: R
>            Reporter: Romain François
>            Assignee: Romain François
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 0.12.0
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> To support the "Writing and Reading Streams" section of the vignette, perhaps we should rely more on the RecordBatchStreamWriter class and less the `write_record_batch` function. 
> We should be able to write code resembling the python api : 
> {code:r}
> batch <- ... 
> sink <- buffer_output_stream()
> writer <- record_batch_stream_writer(sink, batch$schema())
> writer$write_batch()
> writer$close()
> sink$getvalue()
> {code}
> Most of the code is there, but we need to add 
> - RecordBatchStreamWriter$write_batch() : write a record batch to the stream. We already have RecordBatchStreamWriter$WriteRecordBatch
> - RecordBatchStreamWriter$close() : not sure why it is lower case close() in python but upper case in C++. We already have RecordBatchWriter$Close()
> - BufferOutputStream$getvalue() : we already have BufferOutputStream$Finish()
> Currently the constructor for a BufferOutputStream is buffer_output_stream(), perhaps we can align with python and make it BufferOutputStream, that would not clash with the `arrow::BufferOutputStream` class because of the namespacing. 



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