Group By & Aggregation

g[grouping_expr(x)](x:expression)

generates collection of groups

Examples:

g := g[value(x/@state)](x:child(/Customer))

groups the Customer vertices by state

m[ e[ n[E, “StateReport”, y](null),)

n[A, “state”, child(pick(x))/@state](y),

n[A, “no_of_customers”, n[integer](count(x))](y)

] (y: n[element]())

](x:g)

generates new

<StateReport state=“…” no_of_customers=“…”/> elements.

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