Would it be possible to cast an expression into a specific datatype without casting the source columns?

I would like to get value from column whose name is in another column.

This might be linked to Polars DataFrame – Decimal Precision doubles on mul with Integer.

I have this code:

I want to make the string of empty dictionary to be a struct, but json_decode fails as there are some rows with strings of empty dictionary in a df

I want to make the string of empty dictionary to be a struct, but json_decode fails as there are some rows with strings of empty dictionary in a df

Do string operations on Categorical columns cast the entire column to String first and then perform the operation, or where possible do they operate on the (presumably [much] smaller) Categorical Dictionary directly?

Do string operations on Categorical columns cast the entire column to String first and then perform the operation, or where possible do they operate on the (presumably [much] smaller) Categorical Dictionary directly?

Do string operations on Categorical columns cast the entire column to String first and then perform the operation, or where possible do they operate on the (presumably [much] smaller) Categorical Dictionary directly?

Do string operations on Categorical columns cast the entire column to String first and then perform the operation, or where possible do they operate on the (presumably [much] smaller) Categorical Dictionary directly?