repeated NPE fix on DateColumn
@@ -275,7 +275,7 @@ public class DateColumn extends AbstractColumn implements DateMapUtils {
for (int r = 0; r < this.size(); r++) {
int c1 = this.getIntInternal(r);
if (c1 == DateColumn.MISSING_VALUE) {
- newColumn.add(null);
+ newColumn.add(CategoryColumn.MISSING_VALUE);
} else {
newColumn.add(PackedLocalDate.getDayOfWeek(c1).toString());
}
