Github user wzhfy commented on the issue: https://github.com/apache/spark/pull/16422 @cloud-fan and I discussed about complex typed column, and he suggested we don't support desc table column command for complex column, because there's no more information when describing `info.name` than just `info` for the `name` attribute. And if we don't plan to support describing complex typed column, we can change `describeColName` to `identifier`. So we want to make sure what's the behavior of other databases on describing complex typed columns.
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