fix for NPE downstream of this method
@@ -288,7 +288,7 @@ public class DateTimeColumn extends AbstractColumn implements DateTimeMapUtils,
for (int r = 0; r < this.size(); r++) {
long c1 = this.getLongInternal(r);
if (c1 == (DateTimeColumn.MISSING_VALUE)) {
- newColumn.set(r, null);
+ newColumn.set(r, CategoryColumn.MISSING_VALUE);
} else {
newColumn.add(PackedLocalDateTime.getDayOfWeek(c1).toString());
}
