fuwhu opened a new pull request #26513: [SPARK-29834][SQL]DESC DATABASE should look up catalog like v2 commands URL: https://github.com/apache/spark/pull/26513 ### What changes were proposed in this pull request? Add DescribeNamespaceStatement, DescribeNamespace and DescribeNamespaceExec to make "DESC DATABASE" look up catalog like v2 commands. ### Why are the changes needed? It's important to make all the commands have the same table resolution behavior, to avoid confusing end-users. Also to fix [SPARK-29834](https://issues.apache.org/jira/browse/SPARK-29834). ### Does this PR introduce any user-facing change? no ### How was this patch tested? New unit test
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