Add collapse unique and count unique to groupBy (Ira)

[GoogleCodeExporter]

when using groupBy, I often feel the need to count unique identifiers rather 
than just collapse them into a comma delimited list with redundancies. 
Obviously, I can then parse this list to count unique, but this is hard to with 
Awk or unix utilities (at least with my knowledge) without changing the useful 
groupBy output format. Basically, a groupBy uniq -c is what I'm asking for. I'm 
guessing you have an easy way to do this outside of groupBy, which is why you 
haven't added it yet? or am i missing some existing functionality. 

Original issue reported on code.google.com by iraha...@gmail.com on 17 Sep 2011 at 8:28

[GoogleCodeExporter]

Original comment by aaronqui...@gmail.com on 20 Sep 2011 at 12:45

• Changed state: Accepted
• Added labels: Type-Enhancement
• Removed labels: Type-Defect

[GoogleCodeExporter]

Original comment by aaronqui...@gmail.com on 14 May 2012 at 2:00

• Changed state: Fixed