in src/main/java/com/google/cloud/solutions/bqremoteencryptionfn/fns/Base64Fn.java [57:64]
public ImmutableList<String> deidentifyUnaryRow(List<String> rows) {
var encoder = Base64.getEncoder();
return rows.stream()
.map(row -> row.getBytes(StandardCharsets.UTF_8))
.map(encoder::encodeToString)
.collect(toImmutableList());
}