Phil-ZXX questions

• Expand/Unnest Polars struct into rows, not into columns
• Fill several polars columns with a constant value
• Rename all columns in dataframe to lowercase
• NAN Differences - std::nan vs quiet_NaN() vs Macro NAN
• Use format specifier to convert float/int column in polars dataframe to string
• Force Visual Studio to Step Into STL classes/functions
• Polars Dataframe full-join (outer) on multiple columns without suffix
• Read File At Compile Time (constexpr or other)
• Partial class template argument deduction in C++17
• Apply function to rolling window

Phil-ZXX answers