imback82 opened a new pull request #26304: [SPARK-29592][SQL] ALTER TABLE (set 
partition location) should look up catalog/table like v2 commands
URL: https://github.com/apache/spark/pull/26304
 
 
   ### What changes were proposed in this pull request?
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   Update `AlterTableSetLocationStatement` to store `partitionSpec` and make 
`ALTER TABLE a.b.c PARTITION(...) SET LOCATION 'loc'` fail if `partitionSpec` 
is set with unsupported message.
   
   ### Why are the changes needed?
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     1. If you propose a new API, clarify the use case for a new API.
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   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 t // success and describe the table t from my_catalog
   ALTER TABLE t PARTITION(...) SET LOCATION 'loc' // report set location with 
partition spec is not supported.
   ```
   ### Does this PR introduce any user-facing change?
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   If yes, please clarify the previous behavior and the change this PR proposes 
- provide the console output, description and/or an example to show the 
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   yes. When running ALTER TABLE (set partition location), Spark fails the 
command if the current catalog is set to a v2 catalog, or the table name 
specified a v2 catalog.
   
   ### How was this patch tested?
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   New unit tests

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