huaxingao opened a new pull request #26453: [SPARK-29730][SQL] ALTER VIEW QUERY 
should look up catalog/table like v2 commands
URL: https://github.com/apache/spark/pull/26453
 
 
   ### What changes were proposed in this pull request?
   Add AlterViewAsStatement and make ALTER VIEW ... QUERY go through the same 
catalog/table resolution framework of v2 commands.
   
   
   ### Why are the changes needed?
   It's important to make all the commands have the same table resolution 
behavior, to avoid confusing end-users. e.g.
   ```
   USE my_catalog
   DESC v // success and describe the view v from my_catalog
   ALTER VIEW v SELECT 1 // report view not found as there is no view v in the 
session catalog
   ```
   
   ### Does this PR introduce any user-facing change?
   Yes. When running ALTER VIEW ... QUERY, Spark fails the command if the 
current catalog is set to a v2 catalog, or the view name specified a v2 catalog.
   
   
   ### How was this patch tested?
   unit tests
   

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