Add estimations of column sizes

[jthi]

What inspired this wish list request? 

Working with large tables and wondering if it would be worth it to move some columns to separate table making the table creation much more complex process.

What is the improvement you would like to see? 

I would like to have estimation of how much space each of my columns in my table take (compressed/non-compressed). This could be part of Columns Manager if it cannot be implemented to columns panel. This could also be potentially expanded to contain all different "size taking" parts of the table: column properties, table scripts and so on in some sort of "Table Manager" platform which we do not currently have.

And, of course as a scripter, I would like to have << Get Size (or something similar) message I can send to data table column to get sizes in JSL. 

Why is this idea important? 

Makes it easier to understand which columns are taking how much space in your data table. 

[hogi]

nice idea.

please distinguish between Memory usage in the memory of the computer - and for disk storage.

Please also add an indicator how much space is occupied if the data is retrieved as a matrix or a list.
Sometimes, dt[0,colname] crashes the memory, while dt << subset() is no problem at all.
-> shows the advanced techniques of compressing data in JMP data tables.