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RE: [grouper-users] group math... union'ing with >2 group factors?

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  • From: Chris Hyzer <>
  • To: Rob Gorrell <>, "" <>
  • Subject: RE: [grouper-users] group math... union'ing with >2 group factors?
  • Date: Wed, 24 Sep 2014 16:59:52 +0000
  • Accept-language: en-US

Composite-Union is the same as adding groups as members to another group, with the exception that composite union is implemented in a much less efficient way than adding groups as members of another group.  Therefore you should never use composite-union, and with groups as members of a group, you can add as many as you want, so essentially you can as many operands as you want.  The new 2.2 UI does not give composite-union as an option (but it does let you edit it if it already exists).  Ok?






From: [mailto:] On Behalf Of Rob Gorrell
Sent: Wednesday, September 24, 2014 10:01 AM
Subject: [grouper-users] group math... union'ing with >2 group factors?


I'm aware that the operators for building composite group take two operands (group factors), a left side and a ride side. but I thought I had heard at one time, union was the exception to this and it was possible to have more than two group factors involved in specifically in the union operation. but I don't see this in the UI, union appears to have the same restriction as intersection and compliment in requiring two and only two factors. Is this true and I misheard? Or am I missing something? Curious about the rationale for only supporting two factors being that group nesting (union) is common on other platforms such as Active Directory without the limitation of just two factors?



Robert W. Gorrell
Systems Architect, Identity and Access Management

University of NC at Greensboro

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