Function convertWithBestEffort

query/query.go:425–439

convert from task.Val to types.Value, based on schema appropriate type is already set in api.Value

(tv *pb.TaskValue, attr string)

// convert from task.Val to types.Value, based on schema appropriate type
// is already set in api.Value
func convertWithBestEffort(tv *pb.TaskValue, attr string) (types.Val, error) {
	// value would be in binary format with appropriate type
	tid := types.TypeID(tv.ValType)
	if !tid.IsScalar() {
		return types.Val{}, errors.Errorf("Leaf predicate:'%v' must be a scalar.", attr)
	}

	// creates appropriate type from binary format
	sv, err := types.Convert(types.Val{Tid: types.BinaryID, Value: tv.Val}, tid)
	if err != nil {
		// This can happen when a mutation ingests corrupt data into the database.
		return types.Val{}, errors.Wrapf(err, "error interpreting appropriate type for %v", attr)
	}
	return sv, nil
}

func mathCopy(dst *mathTree, src *dql.MathTree) error {
	// Either we'll have an operation specified, or the function specified.