[GitHub] [incubator-pinot] fx19880617 commented on issue #5820: Query execution error when grouping by multi-value dimension and non-dictionary encoded dimension

[GitBox <gi...@apache.org>]

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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