Github user rdblue commented on the issue: https://github.com/apache/spark/pull/22547 @jose-torres, I don't mean that the primary purpose of the v2 API is for catalog integration, I mean that the primary use of v2 is with tables that are stored in some catalog. So we should make sure that the plan and design work well with catalog tables. Another reason that catalog tables are important is that the v2 plans require a catalog for consistent behavior. So catalogs are important and I think will affect the implementation details.
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