jayzhan211 commented on PR #7242:
URL: 
https://github.com/apache/arrow-datafusion/pull/7242#issuecomment-1676144678

   One of the problems I met is I would get NullArray from batch (RecordBatch) 
if I did not set the target partition to 1.
   
https://github.com/apache/arrow-datafusion/blob/00627785718d9d98998021bf44585f32c33af3ea/datafusion/core/src/physical_plan/aggregates/no_grouping.rs#L112-L114
   
   CoalescePartitionsExec is the one that sent the batch with NullArray. The 
default partition seems to be 4. I would need to set `set 
datafusion.execution.target_partitions = 1;` in `array.slt`. I'm not yet fully 
understand why it that, not confident on whether this is the correct fix or 
workaround.


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