viirya commented on PR #12082:
URL: https://github.com/apache/datafusion/pull/12082#issuecomment-2318882755

   > if there is a left streamed row with join key (1) from the right side we 
gonna have joined buffered batches where range shows what indices share the 
same join key.
   > 
   > For example
   > 
   > ```
   > Streamed data        Buffered data
   > [1]               -> [0, 1, 1], [1, 1, 2]
   > ```
   > 
   > Should have ranges `[1..3], [0..2]`
   
   
   I don't get the question clearly.
   
   You have `[0, 1, 1]` as buffered indices for same streamed row? Why you have 
same buffered row id `1` twice?
   
   
   
   
   


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