RDataFrame::Display should display all requested columns #7205
Description
Explain what you would like to see improved
When there are many columns in a ROOT::RDataFrame, df.Display(many_columns)->Print() is truncated and doesn't include all the columns requested. I can understand this truncating without any parameter, but when I pass the columns explicitly, no truncating should occur.
The Pandas approach to truncation is better and should be adopted as well - it shows first and last columns with ... in the middle, clearly indicating the truncation.
Setup
- ROOT version: 6.22.06
- Operating system: Ubuntu 18.04
- How you obtained ROOT:
binary download.