Function fetchValue

worker/sort.go:824–843

fetchValue gets the value for a given UID.

(uid uint64, attr string, langs []string, scalar types.TypeID,
	readTs uint64)

// fetchValue gets the value for a given UID.
func fetchValue(uid uint64, attr string, langs []string, scalar types.TypeID,
	readTs uint64) (types.Val, error) {
	// Don't put the values in memory
	pl, err := posting.GetNoStore(x.DataKey(attr, uid), readTs)
	if err != nil {
		return types.Val{}, err
	}

	src, err := pl.ValueFor(readTs, langs)

	if err != nil {
		return types.Val{}, err
	}
	dst, err := types.Convert(src, scalar)
	if err != nil {
		return types.Val{}, err
	}

	return dst, nil
}