CSV output rewrite (Arrow/C++) #1692
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Fixes #1666, fixes #1690
View.to_csv()in C++ using Arrow's CSV support, making CSV writing consistent across Python and JavaScript.View.to_arrow()(and by extension.to_csv()), to include individual row pivot columns (namedColumn Name (Group by #)). This was previously unimplemented for.to_arrow(), and rendered as a single,separated link from.to_csv()(which is conflated with the CSV's own,causing CSV output withrow_pivots> 1 don't render correctly #1666).As a side effect, the performance of
.to_csv()methods has been increased ~4x for both Python and JavaScript.