imback82 commented on a change in pull request #26006: [SPARK-29279][SQL] Merge 
SHOW NAMESPACES and SHOW DATABASES code path
URL: https://github.com/apache/spark/pull/26006#discussion_r331732290
 
 

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 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/connector/catalog/LookupCatalog.scala
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 @@ -102,7 +102,7 @@ private[sql] trait LookupCatalog extends Logging {
     }
   }
 
-  type CurrentCatalogAndNamespace = (CatalogPlugin, Seq[String])
+  type CurrentCatalogAndNamespace = (CatalogPlugin, Option[Seq[String]])
 
 Review comment:
   Thanks, I will update it.

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