bowenli86 opened a new pull request #6997: [FLINK-10697] Create an in-memory catalog that stores Flink's meta objects URL: https://github.com/apache/flink/pull/6997 ## What is the purpose of the change Currently all Flink meta objects (currently tables only) are temporarily stored in memory as part of Calcite catalog. As we introduce catalog for those objects (tables, views, and UDFs), it makes sense to organize them neatly. Further, having a catalog implementation that store those objects in memory is to retain the currently behavior, which can be configured by user. `FlinkInMemoryCatalog` is similar to existing `InMemoryExternalCatalog` class, which exists only for testing purpose. `FlinkInMemoryCatalog` requires a minimum of implementation of `CrudExternalCatalog` interface. For instance, it doesn’t need subcatalogs. While it’s possible to extract some common code from `InMemoryExternalCatalog` and let `InMemoryExternalCatalog` extend from `FlinkInMemoryCatalog`, it’s very likely the two will divert at some point. Thus, it’s acceptable to have two independent classes from the very beginning. ## Brief change log - added an in-memory impl of `CrudExternalCatalog` as `FlinkInMemoryCatalog` for production use - renamed `InMemoryExternalCatalog` to `TestingInMemoryCatalog` to clarify its usage scope ## Verifying this change This change is already covered by existing tests, such as *InMemoryExternalCatalogTests*. ## 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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