cloud-fan opened a new pull request, #42036:
URL: https://github.com/apache/spark/pull/42036

   This PR is based on https://github.com/apache/spark/pull/42022 to fix tests, 
as the PR author is on vacation.
   
   ### What changes were proposed in this pull request?
   In the PR, I propose to add new trait `CTEInChildren` and mix it to some 
commands that should have `WithCTE` on top of their children (queries) instead 
of main query. Also I modified  the `CTESubstitution` rule and removed special 
handling of `Command`s and similar nodes. After the changes, `Command`, 
`ParsedStatement` and `InsertIntoDir` are handled in the same way as other 
queries by referring to CTE Defs. Only the difference is in `WithCTE` is not 
not placed on the top of main query but on top of command queries.
   
   Closes #41922
   
   ### Why are the changes needed?
   To improve code maintenance. Right now the CTE resolution code path is 
diverged: query with commands go into CTE inline code path where non-command 
queries go into CTEDef code path. 
   
   ### Does this PR introduce _any_ user-facing change?
   No.
   
   ### How was this patch tested?
   By running new test:
   ```
   $ build/sbt "test:testOnly *InsertSuite"
   ```


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