nizarhejazi commented on code in PR #9086:
URL: https://github.com/apache/pinot/pull/9086#discussion_r929689219
##########
pinot-core/src/main/java/org/apache/pinot/core/query/aggregation/function/MaxAggregationFunction.java:
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@@ -28,13 +28,19 @@
import
org.apache.pinot.core.query.aggregation.groupby.DoubleGroupByResultHolder;
import org.apache.pinot.core.query.aggregation.groupby.GroupByResultHolder;
import org.apache.pinot.segment.spi.AggregationFunctionType;
+import org.roaringbitmap.RoaringBitmap;
public class MaxAggregationFunction extends
BaseSingleInputAggregationFunction<Double, Double> {
private static final double DEFAULT_INITIAL_VALUE = Double.NEGATIVE_INFINITY;
+ private final boolean _nullHandlingEnabled;
- public MaxAggregationFunction(ExpressionContext expression) {
+ // stores id of the groupKey where the corresponding value is null.
+ private Integer _groupKeyForNullValue = null;
Review Comment:
@Jackie-Jiang The problem with tracking `groupKeyForNullValue` in
`GroupByExecutor` is the following:
- In `MaxAggregationFunction`, `DEFAULT_INITIAL_VALUE` is
`Double.NEGATIVE_INFINITY`. `aggregateGroupBySV()` calls `setValueForKey` only
if the value > `DEFAULT_INITIAL_VALUE` (or the latest set value).
`DEFAULT_INITIAL_VALUE` could be a valid non-null value or a null value (e.g.
dimension column). If `nullHandlingEnabled` is set to true, we should not run
this check (value > `DEFAULT_INITIAL_VALUE`). In summary, if
`nullHandlingEnabled` is set to true, the whole range of values in a data type
is a valid range including `Double.NEGATIVE_INFINITY`.
- The same applies to `MinAggregationFunction`, and the `DEFAULT_VALUE` =
`Double.POSITIVE_INFINITY`.
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