beliefer commented on pull request #32442:
URL: https://github.com/apache/spark/pull/32442#issuecomment-834979841


   > We accept `SHOW XXX` DDLs in common table exprs but we don't accept them 
in a FROM clause like `SELECT * FROM (SHOW NAMESPACES)`? This new feature 
itself looks good. Btw, is this PR related to #31548? It seems the motivation 
is the same, but the approaches/the jira numbers are different?
   
   Yes, this PR related to #31548. A discussion 
https://github.com/apache/spark/pull/31548#issuecomment-814170427


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