Add support for aggregates like SUM/COUNT in Datalog

Registered by Madhu Mohan Nelemane on 2014-10-10

Aggregates like SUM, COUNT, MAX that work on a collection of records are helpful in writing datalog policies involving multiple records ( For ex: To define entities like Max number of ports, Least number of VMs ) etc.

Blueprint information

Status:
Not started
Approver:
Tim Hinrichs
Priority:
Medium
Drafter:
None
Direction:
Approved
Assignee:
None
Definition:
Approved
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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Gerrit topic: https://review.openstack.org/#q,topic:bp/datalog-aggregates,n,z

Addressed by: https://review.openstack.org/140253
    Add support for aggregates like SUM/COUNT in Datalog

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