Add quote style to csv writer #9004
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alamb
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Dec 16, 2025
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Thanks @xanderbailey - this is looking good
| pub use self::reader::Reader; | ||
| pub use self::reader::ReaderBuilder; | ||
| pub use self::reader::infer_schema_from_files; | ||
| pub use self::writer::QuoteStyle; |
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This is publicly exporting something from the csv crate (which I think is good): https://docs.rs/csv/latest/csv/enum.QuoteStyle.html
arrow-csv/src/writer.rs
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| //! | ||
| //! ## Available Quoting Styles | ||
| //! | ||
| //! - `QuoteStyle::Necessary` (default): Only quotes fields when necessary (e.g., when they |
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I think this is redundant with the existing documentation on QuoteStyle -- the link above to QuoteStyle is probably fine
arrow-csv/src/writer.rs
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| .unwrap(); | ||
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| // Test with QuoteStyle::Necessary (default) | ||
| let mut buf = Vec::new(); |
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Can you please reduce some of this boiler plate code? It is obscuring what is going on in the tests -- maybe a helper so these tests end up looking something like this:
assert_eq!(
"text,number,float\nhello,1,1.1\nworld,2,2.2\n\"comma,value\",3,3.3\n\"quote\"\"test\",4,4.4\n",
write_quote_style(batch, QuoteStyle::Necessary
)
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Which issue does this PR close?
Following on from #8960, we are now exposing the quote style as a part of the csv writer options which allows users to quote columns similar to Spark's
quoteAllsetting.Rationale for this change
What changes are included in this PR?
Expose
QuoteStylein theWriterBuilderAre these changes tested?
Yes with examples and unit tests.
Are there any user-facing changes?