ankitsultana opened a new issue, #10124:
URL: https://github.com/apache/pinot/issues/10124
When we run an aggregation query without any grouping-sets, if no rows match
the operators under the aggregation then the result is empty. Example:
```
select
count(*)
from
baseballStats_OFFLINE
WHERE
playerID IN (
select
playerID
from
baseballStats_OFFLINE
where
teamID = 'foo'
)
```
The expected behavior here would be to receive a single row `[0]` but
instead we don't get any rows. The solution is a bit long. If there are no
grouping sets, then we need to reduce the results in a single worker since
there's essentially no distribution key to allow for parallel computation.
cc: @walterddr @siddharthteotia
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