cloud-fan commented on code in PR #37588:
URL: https://github.com/apache/spark/pull/37588#discussion_r1380278496


##########
sql/core/src/test/scala/org/apache/spark/sql/execution/command/ShowTablesSuiteBase.scala:
##########
@@ -126,4 +158,258 @@ trait ShowTablesSuiteBase extends QueryTest with 
DDLCommandTestUtils {
       }
     }
   }
+
+  test("show table in a not existing namespace") {
+    checkError(
+      exception = intercept[AnalysisException] {
+        sql(s"SHOW TABLES IN $catalog.nonexist")
+      },
+      errorClass = "SCHEMA_NOT_FOUND",
+      parameters = Map("schemaName" -> "`nonexist`"))
+  }
+
+  test("show table extended in a not existing namespace") {
+    checkError(
+      exception = intercept[AnalysisException] {
+        sql(s"SHOW TABLE EXTENDED IN $catalog.nonexist LIKE '*tbl*'")
+      },
+      errorClass = "SCHEMA_NOT_FOUND",
+      parameters = Map("schemaName" -> "`nonexist`"))
+  }
+
+  test("show table extended in a not existing table") {

Review Comment:
   ```suggestion
     test("show table extended with no matching table") {
   ```



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