[
https://issues.apache.org/jira/browse/ARROW-7035?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Neal Richardson reassigned ARROW-7035:
--------------------------------------
Assignee: Karl Dunkle Werner
> [R] Default arguments are unclear in write_parquet docs
> -------------------------------------------------------
>
> Key: ARROW-7035
> URL: https://issues.apache.org/jira/browse/ARROW-7035
> Project: Apache Arrow
> Issue Type: Improvement
> Components: R
> Affects Versions: 0.15.0
> Environment: Ubuntu with libparquet-dev 0.15.0-1, R 3.6.1, and arrow
> 0.15.0.
> Reporter: Karl Dunkle Werner
> Assignee: Karl Dunkle Werner
> Priority: Minor
> Labels: documentation, pull-request-available
> Fix For: 1.0.0
>
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> Thank you so much for adding support for reading and writing parquet files in
> R! I have a few questions about the user interface and optional arguments,
> but I want to highlight how great it is to have this useful filetype to pass
> data back and forth.
> The defaults for the optional arguments in {{arrow::write_parquet}} aren't
> always clear. Here were my questions after reading the help docs from
> {{write_parquet}}:
> * What's the default {{version}}? Should a user prefer "2.0" for new
> projects?
> * What are acceptable values for {{compression}}? (Answer: {{uncompressed}},
> {{snappy}}, {{gzip}}, {{brotli}}, {{zstd}}, or {{lz4}}.)
> * What's the default for {{use_dictionary}}? Seems to be {{TRUE}}, at least
> some of the time.
> * What's the default for {{write_statistics}}? Should a user prefer {{TRUE}}?
> * Can I assume {{allow_truncated_timestamps}} is {{FALSE}} by default?
> As someone who works in both R and Python, I was a little surprised when
> pyarrow uses snappy compression by default, but R's default is uncompressed.
> My preference would be having the same default arguments, but that might be a
> fringe use-case.
> While I was digging into this, I was surprised that
> {{ParquetReaderProperties}} is exported and documented, but
> {{ParquetWriterProperties}} isn't. Is that intentional?
> Thanks!
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
