nastra commented on code in PR #9852:
URL: https://github.com/apache/iceberg/pull/9852#discussion_r1516255802


##########
hive-metastore/src/main/java/org/apache/iceberg/hive/HiveCatalog.java:
##########
@@ -222,53 +231,203 @@ public boolean dropTable(TableIdentifier identifier, 
boolean purge) {
 
   @Override
   public void renameTable(TableIdentifier from, TableIdentifier originalTo) {
-    if (!isValidIdentifier(from)) {
-      throw new NoSuchTableException("Invalid identifier: %s", from);
+    renameEntity(from, originalTo, "Table");
+  }
+
+  @Override
+  public boolean dropView(TableIdentifier identifier) {
+    if (!isValidIdentifier(identifier)) {
+      return false;
+    }
+
+    try {
+      String database = identifier.namespace().level(0);
+      String viewName = identifier.name();
+      Table table = clients.run(client -> client.getTable(database, viewName));
+      HiveOperationsBase.validateTableIsIcebergView(
+          table, CatalogUtil.fullTableName(name, identifier));
+
+      HiveViewOperations ops = (HiveViewOperations) newViewOps(identifier);
+      ViewMetadata lastViewMetadata = null;
+
+      try {
+        lastViewMetadata = ops.current();
+      } catch (NotFoundException e) {
+        LOG.warn(
+            "Failed to load table metadata for table: {}, continuing drop 
without purge",
+            identifier,
+            e);
+      }
+
+      clients.run(
+          client -> {
+            client.dropTable(database, viewName);
+            return null;
+          });
+
+      if (lastViewMetadata != null) {
+        CatalogUtil.dropViewMetaData(ops.io(), lastViewMetadata);
+      }
+
+      LOG.info("Dropped View: {}", identifier);
+      return true;
+
+    } catch (NoSuchViewException | NoSuchObjectException e) {
+      LOG.info("Skipping drop, View does not exist: {}", identifier, e);
+      return false;
+    } catch (TException e) {
+      throw new RuntimeException("Failed to drop " + identifier, e);
+    } catch (InterruptedException e) {
+      Thread.currentThread().interrupt();
+      throw new RuntimeException("Interrupted in call to dropView", e);
+    }
+  }
+
+  @Override
+  public List<TableIdentifier> listViews(Namespace namespace) {
+    Preconditions.checkArgument(
+        isValidateNamespace(namespace), "Missing database in namespace: %s", 
namespace);
+
+    try {
+      return listTablesByType(
+          namespace, TableType.VIRTUAL_VIEW, 
HiveOperationsBase.ICEBERG_VIEW_TYPE_VALUE);
+    } catch (UnknownDBException e) {
+      throw new NoSuchNamespaceException("Namespace does not exist: %s", 
namespace);
+
+    } catch (TException e) {
+      throw new RuntimeException("Failed to list all views under namespace " + 
namespace, e);
+
+    } catch (InterruptedException e) {
+      Thread.currentThread().interrupt();
+      throw new RuntimeException("Interrupted in call to listViews", e);
     }
+  }
+
+  private List<TableIdentifier> listTablesByType(
+      Namespace namespace, TableType tableType, String tableTypeProp)
+      throws TException, InterruptedException {
+    String database = namespace.level(0);
+    List<String> tableNames = clients.run(client -> client.getTables(database, 
"*", tableType));
+
+    // Retrieving the Table objects from HMS in batches to avoid OOM
+    List<TableIdentifier> filteredTableIdentifiers = Lists.newArrayList();
+    Iterable<List<String>> tableNameSets = Iterables.partition(tableNames, 
100);
+
+    for (List<String> tableNameSet : tableNameSets) {
+      filteredTableIdentifiers.addAll(filterIcebergTables(tableNameSet, 
namespace, tableTypeProp));
+    }
+
+    return filteredTableIdentifiers;
+  }
+
+  private List<TableIdentifier> filterIcebergTables(
+      List<String> tableNames, Namespace namespace, String tableTypeProp)
+      throws TException, InterruptedException {
+    List<Table> tableObjects =
+        clients.run(client -> client.getTableObjectsByName(namespace.level(0), 
tableNames));
+    return tableObjects.stream()
+        .filter(
+            table ->
+                table.getParameters() != null
+                    && tableTypeProp.equalsIgnoreCase(
+                        
table.getParameters().get(BaseMetastoreTableOperations.TABLE_TYPE_PROP)))
+        .map(table -> TableIdentifier.of(namespace, table.getTableName()))
+        .collect(Collectors.toList());
+  }
+
+  @Override
+  @SuppressWarnings("FormatStringAnnotation")
+  public void renameView(TableIdentifier from, TableIdentifier originalTo) {
+    if (!namespaceExists(originalTo.namespace())) {
+      throw new NoSuchNamespaceException(
+          "Cannot rename %s to %s. Namespace does not exist: %s",
+          from, originalTo, originalTo.namespace());
+    }
+    renameEntity(from, originalTo, "View");
+  }
 
-    TableIdentifier to = removeCatalogName(originalTo);
+  private void renameEntity(
+      TableIdentifier fromIdentifierEntity, TableIdentifier 
toIdentifierEntity, String entityType) {

Review Comment:
   ```suggestion
         TableIdentifier from, TableIdentifier to, String entityType) {
   ```



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