Function filterCopy

query/query.go:458–489

(sg *SubGraph, ft *dql.FilterTree)

}

func filterCopy(sg *SubGraph, ft *dql.FilterTree) error {
	// Either we'll have an operation specified, or the function specified.
	if len(ft.Op) > 0 {
		sg.FilterOp = ft.Op
	} else {
		sg.Attr = ft.Func.Attr
		if !isValidFuncName(ft.Func.Name) {
			return errors.Errorf("Invalid function name: %s", ft.Func.Name)
		}

		if isUidFnWithoutVar(ft.Func) {
			sg.SrcFunc = &Function{Name: ft.Func.Name}
			if err := sg.populate(ft.Func.UID); err != nil {
				return err
			}
		} else {
			if ft.Func.Attr == "uid" {
				return errors.Errorf(`Argument cannot be "uid"`)
			}
			sg.createSrcFunction(ft.Func)
			sg.Params.NeedsVar = append(sg.Params.NeedsVar, ft.Func.NeedsVar...)
		}
	}
	for _, ftc := range ft.Child {
		child := &SubGraph{}
		if err := filterCopy(child, ftc); err != nil {
			return err
		}
		sg.Filters = append(sg.Filters, child)
	}
	return nil
}

func uniqueKey(gchild *dql.GraphQuery) string {
	key := gchild.Attr