Github user beyond1920 commented on the issue:
https://github.com/apache/flink/pull/3406
@twalthr , thanks for the review. I have updated the pr based on your
suggestion. I would add documents later in the pr #3409. About the name of
ExternalCatalog, I notice that there are three kinds of catalog at flink now,
the first one is calcite catalog, the second one is function catalog, the third
one is the external catalog. I add 'external' prefix to distinguish them.
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