abhishekagarwal87 commented on code in PR #14655:
URL: https://github.com/apache/druid/pull/14655#discussion_r1274342141
##########
processing/src/main/java/org/apache/druid/query/aggregation/last/StringLastVectorAggregator.java:
##########
@@ -42,7 +42,7 @@ public class StringLastVectorAggregator implements
VectorAggregator
protected long lastTime;
public StringLastVectorAggregator(
- final BaseLongVectorValueSelector timeSelector,
+ @Nullable final BaseLongVectorValueSelector timeSelector,
Review Comment:
those aggregators are never created with null timeSelector.
```
BaseLongVectorValueSelector timeSelector = (BaseLongVectorValueSelector)
columnSelectorFactory.makeValueSelector(
timeColumn);
if (capabilities == null || capabilities.isNumeric()) {
return new DoubleLastVectorAggregator(timeSelector, valueSelector);
} else {
return NumericNilVectorAggregator.doubleNilVectorAggregator();
}
```
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