alamb commented on issue #14691:
URL: https://github.com/apache/datafusion/issues/14691#issuecomment-2691430295

   I believe in  
https://github.com/apache/datafusion/pull/14919/files#r1975931108 
@berkaysynnada  is saying that the input plan is not valid:
   
   ```
   "SortExec: expr=[a@0 ASC], preserve_partitioning=[false]",
   "  AggregateExec: mode=SinglePartitioned, gby=[a@0 as a1], aggr=[]", < --- 
since this is SinglePartitioned it should have more than one input partition
   "    CoalescePartitionsExec",
   "      ProjectionExec: expr=[a@0 as a, b@1 as value]",
   "        UnionExec",
   "          DataSourceExec: file_groups={1 group: [[x]]}, projection=[a, b, 
c, d, e], file_type=parquet",
   "          DataSourceExec: file_groups={1 group: [[x]]}, projection=[a, b, 
c, d, e], file_type=parquet"
   ```


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