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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