andygrove opened a new issue, #38:
URL: https://github.com/apache/datafusion-java/issues/38
### Is your feature request related to a problem or challenge?
`DataFrame.writeParquet` shipped in #27, but the symmetric CSV writer is
missing. DataFusion exposes `DataFrame::write_csv`, which is commonly
used for ad-hoc exports.
### Describe the solution you'd like
- Add a `CsvWriteOptions` value class covering the knobs that
`DataFrameWriteOptions` + CSV-specific options expose
(single-file output, partition columns, header, delimiter, quote,
escape, null-value string, compression).
- Add `proto/csv_write_options.proto`, following the convention
established by `parquet_write_options.proto` in #27.
- Expose `DataFrame.writeCsv(path[, options])`.
- Cover with tests in the spirit of `DataFrameWriteParquetTest`
(single-file, compression, retain-after-write semantics).
### Describe alternatives you've considered
`COPY (SELECT * FROM df) TO '…'` via SQL works but requires a
registered name and a SQL detour.
### Additional context
Aligns the writer story: with this and the JSON writer, we cover the
three formats DataFusion's DataFrame API can write today
(`write_parquet`, `write_csv`, `write_json`).
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