egalpin opened a new issue, #10838:
URL: https://github.com/apache/pinot/issues/10838
Assuming that `myMVdateTimeCol` is an MV column of type `LONG`, the
following will fail with a NullPointerException (root cause:
`ProjectionOperator` is used rather than `GroupByOperator`, where
`ProjectionOperator` which eventually causes a call to
`FixedByteMVMutableForwardIndex#readDictIds` which throws
`UnsupportedOperationException` from the default impl on the
`MutableForwardIndex` interface).
```sql
SELECT
TODATETIME("myMVdateTimeCol", 'e:HH:mm:ss', 'UTC') as myTransformedVal,
count(1) as _count
FROM
myTable
GROUP BY
myTransformedVal
```
However, if the same query is executed without `TODATETIME` in the
projection, it succeeds.
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