haizhou-zhao commented on code in PR #6045:
URL: https://github.com/apache/iceberg/pull/6045#discussion_r1020582495


##########
hive-metastore/src/test/java/org/apache/iceberg/hive/TestHiveCatalog.java:
##########
@@ -426,6 +510,194 @@ public void testSetNamespaceProperties() throws 
TException {
         });
   }
 
+  @Test
+  public void testSetNamespaceOwnership() throws TException {
+    setNamespaceOwnershipAndVerify(
+        "set_individual_ownership_on_default_owner",
+        ImmutableMap.of(),
+        ImmutableMap.of(
+            HiveCatalog.HMS_DB_OWNER,
+            "some_individual_owner",
+            HiveCatalog.HMS_DB_OWNER_TYPE,
+            PrincipalType.USER.name()),
+        System.getProperty("user.name"),
+        PrincipalType.USER,
+        "some_individual_owner",
+        PrincipalType.USER);
+
+    setNamespaceOwnershipAndVerify(
+        "set_group_ownership_on_default_owner",
+        ImmutableMap.of(),
+        ImmutableMap.of(
+            HiveCatalog.HMS_DB_OWNER,
+            "some_group_owner",
+            HiveCatalog.HMS_DB_OWNER_TYPE,
+            PrincipalType.GROUP.name()),
+        System.getProperty("user.name"),
+        PrincipalType.USER,
+        "some_group_owner",
+        PrincipalType.GROUP);
+
+    setNamespaceOwnershipAndVerify(
+        "change_individual_to_group_ownership",
+        ImmutableMap.of(HiveCatalog.HMS_DB_OWNER, "some_owner"),
+        ImmutableMap.of(
+            HiveCatalog.HMS_DB_OWNER,
+            "some_group_owner",
+            HiveCatalog.HMS_DB_OWNER_TYPE,
+            PrincipalType.GROUP.name()),
+        "some_owner",
+        PrincipalType.USER,
+        "some_group_owner",
+        PrincipalType.GROUP);
+
+    setNamespaceOwnershipAndVerify(
+        "change_group_to_individual_ownership",
+        ImmutableMap.of(
+            HiveCatalog.HMS_DB_OWNER,
+            "some_group_owner",
+            HiveCatalog.HMS_DB_OWNER_TYPE,
+            PrincipalType.GROUP.name()),
+        ImmutableMap.of(
+            HiveCatalog.HMS_DB_OWNER,
+            "some_individual_owner",
+            HiveCatalog.HMS_DB_OWNER_TYPE,
+            PrincipalType.USER.name()),
+        "some_group_owner",
+        PrincipalType.GROUP,
+        "some_individual_owner",
+        PrincipalType.USER);
+
+    AssertHelpers.assertThrows(
+        "Setting "
+            + HiveCatalog.HMS_DB_OWNER_TYPE
+            + " and "
+            + HiveCatalog.HMS_DB_OWNER
+            + " has to be performed together or not at all",
+        IllegalArgumentException.class,
+        () -> {
+          try {
+            setNamespaceOwnershipAndVerify(
+                "set_owner_without_setting_owner_type",
+                ImmutableMap.of(),
+                ImmutableMap.of(HiveCatalog.HMS_DB_OWNER, 
"some_individual_owner"),
+                System.getProperty("user.name"),
+                PrincipalType.USER,
+                "no_post_setting_expectation_due_to_exception_thrown",
+                null);
+          } catch (TException e) {
+            throw new RuntimeException("Unexpected Exception", e);
+          }
+        });
+
+    AssertHelpers.assertThrows(
+        "Setting "
+            + HiveCatalog.HMS_DB_OWNER_TYPE
+            + " and "
+            + HiveCatalog.HMS_DB_OWNER
+            + " has to be performed together or not at all",
+        IllegalArgumentException.class,
+        () -> {
+          try {
+            setNamespaceOwnershipAndVerify(
+                "set_owner_type_without_setting_owner",
+                ImmutableMap.of(HiveCatalog.HMS_DB_OWNER, "some_owner"),
+                ImmutableMap.of(HiveCatalog.HMS_DB_OWNER_TYPE, 
PrincipalType.GROUP.name()),
+                "some_owner",
+                PrincipalType.USER,
+                "no_post_setting_expectation_due_to_exception_thrown",
+                null);
+          } catch (TException e) {
+            throw new RuntimeException("Unexpected Exception", e);
+          }
+        });
+
+    AssertHelpers.assertThrows(
+        HiveCatalog.HMS_DB_OWNER_TYPE
+            + " has an invalid value of: "
+            + meta.get(HiveCatalog.HMS_DB_OWNER_TYPE)
+            + ". Acceptable values are: "
+            + 
Stream.of(PrincipalType.values()).map(Enum::name).collect(Collectors.joining(", 
")),
+        IllegalArgumentException.class,
+        () -> {
+          try {
+            setNamespaceOwnershipAndVerify(
+                "set_invalid_owner_type",
+                ImmutableMap.of(),
+                ImmutableMap.of(
+                    HiveCatalog.HMS_DB_OWNER, "iceberg",
+                    HiveCatalog.HMS_DB_OWNER_TYPE, "invalidOwnerType"),
+                System.getProperty("user.name"),
+                PrincipalType.USER,
+                "no_post_setting_expectation_due_to_exception_thrown",
+                null);
+          } catch (TException e) {
+            throw new RuntimeException("Unexpected Exception", e);
+          }
+        });
+  }
+
+  @Test
+  public void testSetNamespaceOwnershipNoop() throws TException {

Review Comment:
   taken. Good idea.



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