nrow and ncol for DataFrameRows and DataFrameColumns

[bkamins]

@nalimilan:
Do we want DataFrameRows and DataFrameColumns to be considered to be Tables.jl tables and eg. define for them nrow and ncol?

[nalimilan]

What's the context of this? I don't see a strong reason not to do this but better have use cases before adding features?

[bkamins]

The context is JuliaData/Tables.jl#278 (comment). If we decide to add nrow and ncol support for Tables.jl tables in general and decide to treat these two types as tables (apart of treating AbstractDataFrame as table) then we should add this support.

[nalimilan]

OK. Let's wait until a decision is made in Tables.jl first?

[bkamins]

Yes, I just want to track this here.