Github user jiangxb1987 commented on the issue:
https://github.com/apache/spark/pull/15717
@cloud-fan @gatorsmile Thank you for comments! Perhaps we should focus on
adding the `ALTER TABLE CHANGE COLUMN` statement, and only support change
column comments in this PR. The remaining issues could be addressed in other
followup PRs in the future.
The view management is not fully designed now, so it's a bit hard to have
detailed discussion on that topic, but I'm sure it will be a really important
topic.
The functions `listColumns` could be removed, since it's only used in
catalog related test cases, we may move the function to `CatalogTestUtils`.
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