A-little-bit-of-data commented on issue #10102:
URL: 
https://github.com/apache/incubator-gluten/issues/10102#issuecomment-3094971476

   > [@A-little-bit-of-data](https://github.com/A-little-bit-of-data), the 
`<unknown>` message in the log may not be related to the perf. issue.
   > 
   > Are the queries you tested standard TPC-DS queries? If so, the result is 
inconsistent with ours. Please check Spark history server's web UI to see 
whether unexpected operator fallback happens, which can cause perf. 
degradation. BTW, have you enabled Gluten columnar shuffle in your test?
   
   My query test statement comes from 
`https://www.cnblogs.com/syw20170419/p/16012807.html;` I used the default 
configuration for gluten and did not configure it separately.


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