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Create table must go through catalog, and in memory catalog is not support CTAS, must be a external catalog.

We can think that there are two types of catalogs in Flink, in-memory catalogs and external catalogs:

In-memory catalog:

Metadata is a copy of the metadata of the external system, and it is up to the user to ensure that the corresponding entity exists in the corresponding external system

External catalog:

I suggest introducing a CTAS clause with a following syntax:

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