Error aliasing an array column.

Hi All: I am getting an "UnsupportedOperationException" when trying to alias an array column. The issue seems to be at "CreateArray" expression -> dataType, which checks for nullability of its children, while aliasing is creating a PrettyAttribute that does not implement nullability. Below is

Drop column/s in DataFrame

Hi All: Is there any plan to add drop column/s functionality in the data frame? One can you select function to do so, but I find that tedious when only one or two columns in large dataframe are to be dropped. Pandas has this functionality, which I find handy when constructing feature vectors