fx19880617 commented on issue #5820:
URL:
https://github.com/apache/incubator-pinot/issues/5820#issuecomment-672493742
Currently we are not supporting No-Dictionary multi-value column in groupby
right now.
The relative code path is in
`org.apache.pinot.core.query.aggregation.groupby.NoDictionaryMultiColumnGroupKeyGenerator`:
```
@Override
public void generateKeysForBlock(TransformBlock transformBlock, int[][]
groupKeys) {
// TODO: Support generating keys for multi-valued columns.
throw new UnsupportedOperationException("Operation not supported");
}
```
I'm looking into the support for this.
cc: @kishoreg @Jackie-Jiang
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