walterddr opened a new issue #8424:
URL: https://github.com/apache/pinot/issues/8424
```
select
playerID,
cast(hits as long) AS totalHits
from baseballStats
order by totalHits DESC
```
works fine.
```
select
playerID,
cast(count(hits) as long) AS totalHits
from baseballStats
group by playerID
order by totalHits DESC
```
gives
```
[
{
"message": "QueryExecutionError:\nProcessingException(errorCode:450,
message:InternalError:\njava.lang.NullPointerException\n\tat
org.apache.pinot.core.operator.combine.GroupByOrderByCombineOperator.mergeResults(GroupByOrderByCombineOperator.java:236)\n\tat
org.apache.pinot.core.operator.combine.BaseCombineOperator.getNextBlock(BaseCombineOperator.java:119)\n\tat
org.apache.pinot.core.operator.combine.BaseCombineOperator.getNextBlock(BaseCombineOperator.java:50)",
"errorCode": 200
}
]
```
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