LantaoJin edited a comment on issue #27185: [SPARK-30494][SQL] Avoid duplicated cached RDD when replace an existing view URL: https://github.com/apache/spark/pull/27185#issuecomment-581423446 > The entry point of `Catalog` is `SparkSession#catalog`. It doesn't help if we only move `Catalog` to catalyst. Yes. Another way is adding an `uncacheTable` method in interface `ExternalCatalog`. And pass cacheManager to `HiveExternalCatalog` construct arguments. But `InMemoryCatalog` in catalyst package can not use `cacheManager`. So the unit test only works when use HiveExternalCatalog.
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