Function uniqueKey

query/query.go:491–527

(gchild *dql.GraphQuery)

}

func uniqueKey(gchild *dql.GraphQuery) string {
	key := gchild.Attr
	if gchild.Func != nil {
		key += fmt.Sprintf("%v", gchild.Func)
	}
	// This is the case when we ask for a variable.
	if gchild.Attr == "val" {
		// E.g. a as age, result is returned as var(a)
		switch {
		case gchild.Var != "" && gchild.Var != "val":
			key = fmt.Sprintf("val(%v)", gchild.Var)
		case len(gchild.NeedsVar) > 0:
			// For var(s)
			key = fmt.Sprintf("val(%v)", gchild.NeedsVar[0].Name)
		}

		// Could be min(var(x)) && max(var(x))
		if gchild.Func != nil {
			key += gchild.Func.Name
		}
	}
	if gchild.IsCount { // ignore count subgraphs..
		key += "count"
	}
	if len(gchild.Langs) > 0 {
		key += fmt.Sprintf("%v", gchild.Langs)
	}
	if gchild.MathExp != nil {
		// We would only be here if Alias is empty, so Var would be non
		// empty because MathExp should have atleast one of them.
		key = fmt.Sprintf("val(%+v)", gchild.Var)
	}
	if gchild.IsGroupby {
		key += "groupby"
	}
	return key
}

func treeCopy(gq *dql.GraphQuery, sg *SubGraph) error {
	// Typically you act on the current node, and leave recursion to deal with