goldmedal commented on issue #15382:
URL: https://github.com/apache/datafusion/issues/15382#issuecomment-2751311833

   
   > * Add a mode that outputs selection vectors (for now let's use dense 
boolean arrays so it can be added to `RecordBatch`) in `RepartitionExec`. The 
array outputs `true` for each row that has `hash % partition == 0` (and false 
if not).
   
   I'll work on #15383, but I guess there are some duplicate works here.


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