Zouxxyy commented on PR #10646:
URL: 
https://github.com/apache/incubator-gluten/pull/10646#issuecomment-3262328731

   @jinchengchenghh  I tried to offload the CTAS command, and I found two main 
reasons that prevented me from doing so:
   
   1. Many classes need to be copied, and it is difficult to validate fallback 
logic:
   This is because we can only construct the v2 `write` after creating the 
table, which is required for performing the validation. By that point, it's 
already too late to perform proper fallback.
   2. Spark 3.5 alreadly supports columnar v2 write for CTAS after this PR was 
introduced https://github.com/apache/spark/pull/40734, this PR is essentially a 
copy of it.


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