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Add support for nested fields in CSV by encoding them as JSON #54

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ttencate opened this issue Aug 19, 2024 · 0 comments · May be fixed by #55
Open

Add support for nested fields in CSV by encoding them as JSON #54

ttencate opened this issue Aug 19, 2024 · 0 comments · May be fixed by #55

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@ttencate
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ttencate commented Aug 19, 2024 •
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Great tool, glad I found it, because I almost started writing something like this myself!

One thing I ran into, though... nested types can't be exported to CSV.

Error: ArrowReadWriteError(CsvError("Nested type List(Field { name: \"item\", data_type: Utf8, nullable: true, dict_id: 0, dict_is_ordered: false, metadata: {} }) is not supported in CSV"))

Sometimes, we just don't care about the exact format, or don't even care about this particular column, and just want to load the dang thing into a spreadsheet. Encoding non-primitive column types as JSON helps to accomplish just that, and also happens to be non-ambiguous and therefore possibly even useful.
ttencate added a commit to ttencate/pqrs that referenced this issue Aug 19, 2024
@ttencate
Add --nested-fields={error,omit,json} for CSV
ff2b800 
These apply to both `cat` and `head` subcommands, and specify how to
handle nested fields if the output format is CSV (which does not support
nested fields). The default, `--nested-fields=error`, just exits with a
helpful error message.

This also changes the printing of errors escaping from the `main()`
function to use `Display`, rather than `Debug`, in order to make them
more user-friendly.

Fixes manojkarthick#54.
@ttencate ttencate linked a pull request Aug 19, 2024 that will close this issue
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Add --nested-fields={error,omit,json} for CSV ttencate/pqrs
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@ttencate