Karl Dunkle Werner created ARROW-7035: -----------------------------------------
Summary: [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 Fix For: 0.15.1 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)