jzhuge opened a new pull request #28147: [SPARK-31357][SQL][WIP] Catalog api 
for view metadata
URL: https://github.com/apache/spark/pull/28147
 
 
   ### What changes were proposed in this pull request?
   
   View catalog interface.
   View catalog resolution rules.
   View catalog SQL DDL implementations.
   
   ### Why are the changes needed?
   
   Support view catalog in DataSourceV2.
   
   ### Does this PR introduce any user-facing change?
   
   View SQL DDLs.
   DataFrame.table().
   
   ### How was this patch tested?
   
   TODO: unit tests

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