[GitHub] bowenli86 opened a new pull request #7011: [FLINK-10768][Table & SQL] Move external catalog related code from TableEnvironment to CatalogManager

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bowenli86 opened a new pull request #7011: [FLINK-10768][Table & SQL] Move external catalog related code from TableEnvironment to CatalogManager
URL: https://github.com/apache/flink/pull/7011
 
 
   ## What is the purpose of the change
   
   In the design of Flink-Hive integration and external catalog enhancements, we propose using `CatalogManager` to manage all external catalogs and related aspects for a clearer separation. Currently all external catalogs are managed by `TableEnvironment`, which makes TableEnvironment bloated.
   
   Also, as discussed with @twalthr , since we are moving away from Scala, all new feature code will be in Java.
   
   This PR moves all EXISTING external catalogs related code from `TableEnvironment` to `CatalogManager`, and it's the initial step for `CatalogManager`. It blocks `[[FLINK-10698]Create CatalogManager class manages all external catalogs and temporary meta objects](https://issues.apache.org/jira/browse/FLINK-10698)`
   
   This PR is a PURE REFACTOR, only moving APIs around, NO change on the behaviors and NO new feature is added. 
   
   ## Brief change log
   
     - added `CatalogManager` in Java
     - moved external catalog related code from `TableEnvironment` to `CatalogManager`
     - added unit tests in `CatalogManagerTest`
   
   ## Verifying this change
   
   - This change is already covered by existing tests, such as *TableEnvironmentTest*.
   - This change added tests and can be verified as follows:
     - Added unit tests in `CatalogManagerTest`
   
   ## Does this pull request potentially affect one of the following parts:
   
   none
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (no)
   

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