in src/main/java/com/google/cloud/solutions/bqremoteencryptionfn/fns/Base64Fn.java [67:74]
public ImmutableList<String> reidentifyUnaryRow(List<String> rows) {
var decoder = Base64.getDecoder();
return rows.stream()
.map(decoder::decode)
.map(b -> new String(b, StandardCharsets.UTF_8))
.collect(toImmutableList());
}