Szehon Ho created SPARK-51615:
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             Summary: Refactor ShowNamespaces to use RunnableCommand
                 Key: SPARK-51615
                 URL: https://issues.apache.org/jira/browse/SPARK-51615
             Project: Spark
          Issue Type: New Feature
          Components: SQL
    Affects Versions: 4.0.0
            Reporter: Szehon Ho


RunnableCommand is the latest way to run commands. The advantage over the old 
way is that we have a single node (no need for a logicalPlan and physical exec 
node).

We should refactor 'SHOW NAMESPACES' to use the new approach.



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