kkrugler opened a new issue #6642:
URL: https://github.com/apache/incubator-pinot/issues/6642
Currently the code in `DistinctCountHLLAggregationFunction.aggregate()`
looks like:
``` java
public void aggregate(int length, AggregationResultHolder
aggregationResultHolder,
Map<ExpressionContext, BlockValSet> blockValSetMap) {
BlockValSet blockValSet = blockValSetMap.get(_expression);
DataType valueType = blockValSet.getValueType();
if (valueType != DataType.BYTES) {
HyperLogLog hyperLogLog =
getDefaultHyperLogLog(aggregationResultHolder);
switch (valueType) {
case INT:
int[] intValues = blockValSet.getIntValuesSV();
for (int i = 0; i < length; i++) {
hyperLogLog.offer(intValues[i]);
}
break;
case LONG:
...
```
Note the call to `blockValueSet.getIntValuesSV()`. It should check if
`BlockValueSet.isSingleValue()` returns false, and if so then use
`BlockValueSet.getIntValuesMV()`. This will return a two dimensional array
(`[][]`) of values that need iteration.
The same change is needed for all of the other value types.
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