in src/main/java/software/amazon/neptune/csv2rdf/NeptunePropertyGraphElement.java [305:313]
public void add(@NonNull String value) {
for (String v : value.split(NeptuneCsvUserDefinedColumn.ARRAY_VALUE_SEPARATOR)) {
if (v == null || v.isEmpty()) {
continue;
}
super.add(v);
}
}