Drop Columns using Select

[versipellis]

In R's dplyr, you could drop a column using select(df,-columnName) as part of pipe chaining. This is particularly handy for datasets where you have a large number of columns, and only want to drop one column without retyping the rest of the column names. It'd be lovely to see this work with DataFramesMeta's select instead of having to break a LINQ chain to use delete!

[nalimilan]

We should use InvertedIndices's Not for this.

[pdeffebach]

This should be pretty easy to implement, see the way we escape function arguments with cols

DataFramesMeta.jl/src/DataFramesMeta.jl

Line 37 in 8626384

elseif onearg(e, :cols)

[pdeffebach]

Closed as a duplicate of #283