How do you count events in groups of matching eventtypes?

[alekz78]

Looking for the count of events matching every eventtype combination.
For instance:
Given 5 events (e1..e5) that match eventtypes A and B as follows:

1. e1 matches: eventtypeA eventtypeB
   
2. e2 matches: eventtypeA
   
3. e3 matches: eventtypeB
4. e4 matches: eventtypeA eventtypeB
5. e5 matches: eventtypeA

The count I'm looking for is:
EventTypes combination / count:

• eventtypeA eventtypeB 2
• eventtypeA 2
• eventtypeB 1

[gkanapathy]

Seems to me you need to create a field that represents every combination of eventtypes, so:

... | eval comboeventtypes=mvjoin(eventtypes,";") | stats count by comboeventtypes