zhuqi-lucas commented on PR #15380:
URL: https://github.com/apache/datafusion/pull/15380#issuecomment-2896831639

   > Looking at the earlier result
   > 
   > > │ Q1           │  333.47ms │                375.58ms │  1.13x slower │
   > 
   > This is the query
   > 
   > ```
   >         SELECT l_linenumber, l_partkey
   >         FROM lineitem
   >         ORDER BY l_linenumber
   > ```
   > 
   > So it might actually be the case that the changed code is a bit slower for 
this case. In the query there is only little data to copy (so concat batches -> 
concat sort keys doesn't help that much) while maybe the overhead of using 
interleave_batches is higher 🤔
   
   Yeah @Dandandan , even the latest result, it still has regression about Q1.


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