[GitHub] bowenli86 opened a new pull request #6969: [FLINK-10556][Table API & SQL]Add APIs to ExternalCatalog, CrudExternalCatalog and InMemoryCrudExternalCatalog for views and UDFs

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bowenli86 opened a new pull request #6969: [FLINK-10556][Table API & SQL]Add APIs to ExternalCatalog, CrudExternalCatalog and InMemoryCrudExternalCatalog for views and UDFs
URL: https://github.com/apache/flink/pull/6969
 
 
   ## What is the purpose of the change
   
   Currently Flink's external catalog have APIs for tables only. However, views and UDFs are also common objects in a catalog.
   
   Adding initial APIs and in-memory implementations for views and UDFs to external catalog. These APIs are  required when we store Flink views and UDFs in an external persistent storage. These APIs will evolve as we make progress in Flink-Hive integration.
   
   ## Brief change log
   
   - added initial APIs for views and UDFs in `ExternalCatalog` and `CrudExternalCatalog`
   - added in-memory implementations  in `InMemoryCrudExternalCatalog`
   - added relevant tests
   
   ## Verifying this change
   
   This change added tests and can be verified as follows:
   
     - Added unit tests in `InMemoryExternalCatalogTest`
   
   ## Does this pull request potentially affect one of the following parts:
   
   none
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (yes )
     - If yes, how is the feature documented? (JavaDocs)
   

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