Optimizing sum() performance

[lgalatin]

Based on performance #s in this discuss post: https://discuss.dgraph.io/t/optimizing-sum-performance-dgraph-takes-10s-16-vcpu-128gb-ram-postgresql-takes-1-12s-4vcpu-16gb-ram/6684 We need to look into what is causing the slowdown.

[minhaj-shakeel]

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