linhongliu-db opened a new pull request, #39268:
URL: https://github.com/apache/spark/pull/39268

   ### What changes were proposed in this pull request?
   This PR proposes to group all sub-executions together in SQL UI if they 
belong to the same root execution.
   
   We can have some follow-up improvements after this PR:
   1. Add links to SQL page and Job page to indicate the root execution ID.
   2. Better handling for the root execution missing case (e.g. eviction due to 
retaining limit). In this PR, the sub-executions will be displayed ungrouped.
   
   This feature is controlled by conf 
`spark.ui.sql.group.sub.execution.enabled` and the default value is set to 
`true`
   
   ### Why are the changes needed?
   better user experience.
   
   In PR #39220, the CTAS query will trigger a sub-execution to perform the 
data insertion. But the current UI will display the two executions separately 
which may confuse the users.
   In addition, this change should also help the structured streaming cases
   
   
   ### Does this PR introduce _any_ user-facing change?
   TODO
   
   ### How was this patch tested?
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