walterddr opened a new pull request, #12259:
URL: https://github.com/apache/pinot/pull/12259
for some reason this was hit when sketch loaded/used directly from binary
e.g.
```
SELECT
groupKey,
distinctCountThetaSketch(rawSketchBinaryCol) -- this can cause group key
internal null value
FROM tbl
GROUP BY 1
```
so we actually need the null handling code path in extractGroupByResult
similar to extractAggregateResult
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