[spark] use the internal session catalog in spark generic catalog

docs/layouts/shortcodes/generated/spark_connector_configuration.html

@@ -74,5 +74,11 @@
             <td>Boolean</td>
             <td>If true, allow to merge data types if the two types meet the rules for explicit casting.</td>
         </tr>
+        <tr>
+            <td><h5>catalog.create-underlying-session-catalog</h5></td>
+            <td style="word-wrap: break-word;">false</td>
+            <td>Boolean</td>
+            <td>If true, create and use an underlying session catalog instead of default session catalog when use SparkGenericCatalog.</td>
+        </tr>
     </tbody>
 </table>

paimon-spark/paimon-spark-common/src/main/java/org/apache/paimon/spark/SparkCatalog.java

@@ -63,12 +63,11 @@ public class SparkCatalog extends SparkBaseCatalog {
 
     private static final String PRIMARY_KEY_IDENTIFIER = "primary-key";
 
-    private String name = null;
     protected Catalog catalog = null;
 
     @Override
     public void initialize(String name, CaseInsensitiveStringMap options) {
-        this.name = name;
+        this.catalogName = name;
         CatalogContext catalogContext =
                 CatalogContext.create(
                         Options.fromMap(options),
@@ -87,11 +86,6 @@ public Catalog paimonCatalog() {
         return catalog;
     }
 
-    @Override
-    public String name() {
-        return name;
-    }
-
     @Override
     public String[] defaultNamespace() {
         return new String[] {Catalog.DEFAULT_DATABASE};

paimon-spark/paimon-spark-common/src/main/java/org/apache/paimon/spark/SparkConnectorOptions.java

@@ -24,6 +24,13 @@
 
 /** Options for spark connector. */
 public class SparkConnectorOptions {
+
+    public static final ConfigOption<Boolean> CREATE_UNDERLYING_SESSION_CATALOG =
+            key("catalog.create-underlying-session-catalog")
+                    .booleanType()
+                    .defaultValue(false)
+                    .withDescription(
+                            "If true, create and use an underlying session catalog instead of default session catalog when use SparkGenericCatalog.");
     public static final ConfigOption<Boolean> MERGE_SCHEMA =
             key("write.merge-schema")
                     .booleanType()

paimon-spark/paimon-spark-common/src/main/java/org/apache/paimon/spark/SparkGenericCatalog.java

@@ -25,16 +25,20 @@
 import org.apache.paimon.utils.Preconditions;
 
 import org.apache.hadoop.conf.Configuration;
+import org.apache.spark.SparkConf;
 import org.apache.spark.sql.SparkSession;
 import org.apache.spark.sql.catalyst.analysis.NamespaceAlreadyExistsException;
 import org.apache.spark.sql.catalyst.analysis.NoSuchFunctionException;
 import org.apache.spark.sql.catalyst.analysis.NoSuchNamespaceException;
 import org.apache.spark.sql.catalyst.analysis.NoSuchTableException;
 import org.apache.spark.sql.catalyst.analysis.NonEmptyNamespaceException;
 import org.apache.spark.sql.catalyst.analysis.TableAlreadyExistsException;
+import org.apache.spark.sql.catalyst.catalog.ExternalCatalog;
 import org.apache.spark.sql.catalyst.catalog.InMemoryCatalog;
+import org.apache.spark.sql.catalyst.catalog.SessionCatalog;
 import org.apache.spark.sql.connector.catalog.CatalogExtension;
 import org.apache.spark.sql.connector.catalog.CatalogPlugin;
+import org.apache.spark.sql.connector.catalog.CatalogUtils;
 import org.apache.spark.sql.connector.catalog.Identifier;
 import org.apache.spark.sql.connector.catalog.NamespaceChange;
 import org.apache.spark.sql.connector.catalog.SupportsNamespaces;
@@ -43,7 +47,9 @@
 import org.apache.spark.sql.connector.catalog.TableChange;
 import org.apache.spark.sql.connector.catalog.functions.UnboundFunction;
 import org.apache.spark.sql.connector.expressions.Transform;
+import org.apache.spark.sql.execution.datasources.v2.V2SessionCatalog;
 import org.apache.spark.sql.internal.SQLConf;
+import org.apache.spark.sql.internal.SessionState;
 import org.apache.spark.sql.internal.StaticSQLConf;
 import org.apache.spark.sql.types.StructType;
 import org.apache.spark.sql.util.CaseInsensitiveStringMap;
@@ -56,7 +62,6 @@
 
 import static org.apache.paimon.options.CatalogOptions.METASTORE;
 import static org.apache.paimon.options.CatalogOptions.WAREHOUSE;
-import static org.apache.paimon.utils.Preconditions.checkNotNull;
 
 /* This file is based on source code from the Iceberg Project (http://iceberg.apache.org/), licensed by the Apache
  * Software Foundation (ASF) under the Apache License, Version 2.0. See the NOTICE file distributed with this work for
@@ -66,19 +71,18 @@
  * A Spark catalog that can also load non-Paimon tables.
  *
  * <p>Most of the content of this class is referenced from Iceberg's SparkSessionCatalog.
- *
- * @param <T> CatalogPlugin class to avoid casting to TableCatalog and SupportsNamespaces.
  */
-public class SparkGenericCatalog<T extends TableCatalog & SupportsNamespaces>
-        extends SparkBaseCatalog implements CatalogExtension {
+public class SparkGenericCatalog extends SparkBaseCatalog implements CatalogExtension {
 
     private static final Logger LOG = LoggerFactory.getLogger(SparkGenericCatalog.class);
 
     private static final String[] DEFAULT_NAMESPACE = new String[] {"default"};
 
-    private String catalogName = null;
     private SparkCatalog sparkCatalog = null;
-    private T sessionCatalog = null;
+
+    private boolean underlyingSessionCatalogEnabled = false;
+
+    private CatalogPlugin sessionCatalog = null;
 
     @Override
     public Catalog paimonCatalog() {
@@ -92,55 +96,55 @@ public String[] defaultNamespace() {
 
     @Override
     public String[][] listNamespaces() throws NoSuchNamespaceException {
-        return getSessionCatalog().listNamespaces();
+        return asNamespaceCatalog().listNamespaces();
     }
 
     @Override
     public String[][] listNamespaces(String[] namespace) throws NoSuchNamespaceException {
-        return getSessionCatalog().listNamespaces(namespace);
+        return asNamespaceCatalog().listNamespaces(namespace);
     }
 
     @Override
     public boolean namespaceExists(String[] namespace) {
-        return getSessionCatalog().namespaceExists(namespace);
+        return asNamespaceCatalog().namespaceExists(namespace);
     }
 
     @Override
     public Map<String, String> loadNamespaceMetadata(String[] namespace)
             throws NoSuchNamespaceException {
-        return getSessionCatalog().loadNamespaceMetadata(namespace);
+        return asNamespaceCatalog().loadNamespaceMetadata(namespace);
     }
 
     @Override
     public void createNamespace(String[] namespace, Map<String, String> metadata)
             throws NamespaceAlreadyExistsException {
-        getSessionCatalog().createNamespace(namespace, metadata);
+        asNamespaceCatalog().createNamespace(namespace, metadata);
     }
 
     @Override
     public void alterNamespace(String[] namespace, NamespaceChange... changes)
             throws NoSuchNamespaceException {
-        getSessionCatalog().alterNamespace(namespace, changes);
+        asNamespaceCatalog().alterNamespace(namespace, changes);
     }
 
     @Override
     public boolean dropNamespace(String[] namespace, boolean cascade)
             throws NoSuchNamespaceException, NonEmptyNamespaceException {
-        return getSessionCatalog().dropNamespace(namespace, cascade);
+        return asNamespaceCatalog().dropNamespace(namespace, cascade);
     }
 
     @Override
     public Identifier[] listTables(String[] namespace) throws NoSuchNamespaceException {
         // delegate to the session catalog because all tables share the same namespace
-        return getSessionCatalog().listTables(namespace);
+        return asTableCatalog().listTables(namespace);
     }
 
     @Override
     public Table loadTable(Identifier ident) throws NoSuchTableException {
         try {
             return sparkCatalog.loadTable(ident);
         } catch (NoSuchTableException e) {
-            return throwsOldIfExceptionHappens(() -> getSessionCatalog().loadTable(ident), e);
+            return throwsOldIfExceptionHappens(() -> asTableCatalog().loadTable(ident), e);
         }
     }
 
@@ -149,8 +153,7 @@ public Table loadTable(Identifier ident, String version) throws NoSuchTableExcep
         try {
             return sparkCatalog.loadTable(ident, version);
         } catch (NoSuchTableException e) {
-            return throwsOldIfExceptionHappens(
-                    () -> getSessionCatalog().loadTable(ident, version), e);
+            return throwsOldIfExceptionHappens(() -> asTableCatalog().loadTable(ident, version), e);
         }
     }
 
@@ -160,7 +163,7 @@ public Table loadTable(Identifier ident, long timestamp) throws NoSuchTableExcep
             return sparkCatalog.loadTable(ident, timestamp);
         } catch (NoSuchTableException e) {
             return throwsOldIfExceptionHappens(
-                    () -> getSessionCatalog().loadTable(ident, timestamp), e);
+                    () -> asTableCatalog().loadTable(ident, timestamp), e);
         }
     }
 
@@ -169,7 +172,7 @@ public void invalidateTable(Identifier ident) {
         // We do not need to check whether the table exists and whether
         // it is an Paimon table to reduce remote service requests.
         sparkCatalog.invalidateTable(ident);
-        getSessionCatalog().invalidateTable(ident);
+        asTableCatalog().invalidateTable(ident);
     }
 
     @Override
@@ -184,7 +187,7 @@ public Table createTable(
             return sparkCatalog.createTable(ident, schema, partitions, properties);
         } else {
             // delegate to the session catalog
-            return getSessionCatalog().createTable(ident, schema, partitions, properties);
+            return asTableCatalog().createTable(ident, schema, partitions, properties);
         }
     }
 
@@ -193,18 +196,18 @@ public Table alterTable(Identifier ident, TableChange... changes) throws NoSuchT
         if (sparkCatalog.tableExists(ident)) {
             return sparkCatalog.alterTable(ident, changes);
         } else {
-            return getSessionCatalog().alterTable(ident, changes);
+            return asTableCatalog().alterTable(ident, changes);
         }
     }
 
     @Override
     public boolean dropTable(Identifier ident) {
-        return sparkCatalog.dropTable(ident) || getSessionCatalog().dropTable(ident);
+        return sparkCatalog.dropTable(ident) || asTableCatalog().dropTable(ident);
     }
 
     @Override
     public boolean purgeTable(Identifier ident) {
-        return sparkCatalog.purgeTable(ident) || getSessionCatalog().purgeTable(ident);
+        return sparkCatalog.purgeTable(ident) || asTableCatalog().purgeTable(ident);
     }
 
     @Override
@@ -213,13 +216,15 @@ public void renameTable(Identifier from, Identifier to)
         if (sparkCatalog.tableExists(from)) {
             sparkCatalog.renameTable(from, to);
         } else {
-            getSessionCatalog().renameTable(from, to);
+            asTableCatalog().renameTable(from, to);
         }
     }
 
     @Override
     public final void initialize(String name, CaseInsensitiveStringMap options) {
-        Configuration hadoopConf = SparkSession.active().sessionState().newHadoopConf();
+        SessionState sessionState = SparkSession.active().sessionState();
+        Configuration hadoopConf = sessionState.newHadoopConf();
+        SparkConf sparkConf = new SparkConf();
         if (options.containsKey(METASTORE.key())
                 && options.get(METASTORE.key()).equalsIgnoreCase("hive")) {
             String uri = options.get(CatalogOptions.URI.key());
@@ -242,10 +247,21 @@ public final void initialize(String name, CaseInsensitiveStringMap options) {
         this.catalogName = name;
         this.sparkCatalog = new SparkCatalog();
 
-        this.sparkCatalog.initialize(
-                name,
-                autoFillConfigurations(
-                        options, SparkSession.active().sessionState().conf(), hadoopConf));
+        CaseInsensitiveStringMap newOptions =
+                autoFillConfigurations(options, sessionState.conf(), hadoopConf);
+        sparkCatalog.initialize(name, newOptions);
+
+        if (options.getBoolean(
+                SparkConnectorOptions.CREATE_UNDERLYING_SESSION_CATALOG.key(), false)) {
+            this.underlyingSessionCatalogEnabled = false;
+            for (Map.Entry<String, String> entry : options.entrySet()) {
+                sparkConf.set("spark.hadoop." + entry.getKey(), entry.getValue());
+                hadoopConf.set(entry.getKey(), entry.getValue());
+            }
+            ExternalCatalog externalCatalog =
+                    CatalogUtils.buildExternalCatalog(sparkConf, hadoopConf);
+            this.sessionCatalog = new V2SessionCatalog(new SessionCatalog(externalCatalog));
+        }
     }
 
     private CaseInsensitiveStringMap autoFillConfigurations(
@@ -282,30 +298,22 @@ private void fillCommonConfigurations(Map<String, String> options, SQLConf sqlCo
 
     @Override
     @SuppressWarnings("unchecked")
-    public void setDelegateCatalog(CatalogPlugin sparkSessionCatalog) {
-        if (sparkSessionCatalog instanceof TableCatalog
-                && sparkSessionCatalog instanceof SupportsNamespaces) {
-            this.sessionCatalog = (T) sparkSessionCatalog;
-        } else {
-            throw new IllegalArgumentException("Invalid session catalog: " + sparkSessionCatalog);
+    public void setDelegateCatalog(CatalogPlugin delegate) {
+        if (!underlyingSessionCatalogEnabled) {
+            this.sessionCatalog = delegate;
         }
     }
 
-    @Override
-    public String name() {
-        return catalogName;
-    }
-
     private boolean usePaimon(String provider) {
         return provider == null || SparkSource.NAME().equalsIgnoreCase(provider);
     }
 
-    private T getSessionCatalog() {
-        checkNotNull(
-                sessionCatalog,
-                "Delegated SessionCatalog is missing. "
-                        + "Please make sure your are replacing Spark's default catalog, named 'spark_catalog'.");
-        return sessionCatalog;
+    private TableCatalog asTableCatalog() {
+        return (TableCatalog) sessionCatalog;
+    }
+
+    private SupportsNamespaces asNamespaceCatalog() {
+        return (SupportsNamespaces) sessionCatalog;
     }
 
     @Override

paimon-spark/paimon-spark-common/src/main/java/org/apache/paimon/spark/catalog/SparkBaseCatalog.java

@@ -31,6 +31,14 @@
 /** Spark base catalog. */
 public abstract class SparkBaseCatalog
         implements TableCatalog, SupportsNamespaces, ProcedureCatalog, WithPaimonCatalog {
+
+    protected String catalogName;
+
+    @Override
+    public String name() {
+        return catalogName;
+    }
+
     @Override
     public Procedure loadProcedure(Identifier identifier) throws NoSuchProcedureException {
         if (Catalog.SYSTEM_DATABASE_NAME.equals(identifier.namespace()[0])) {

paimon-spark/paimon-spark-common/src/main/scala/org/apache/spark/sql/connector/catalog/CatalogUtils.scala

@@ -0,0 +1,58 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql.connector.catalog
+
+import org.apache.hadoop.conf.Configuration
+import org.apache.spark.SparkConf
+import org.apache.spark.sql.SparkSession
+import org.apache.spark.sql.catalyst.catalog.ExternalCatalog
+import org.apache.spark.sql.internal.StaticSQLConf.CATALOG_IMPLEMENTATION
+import org.apache.spark.util.Utils
+
+import scala.reflect.ClassTag
+import scala.util.control.NonFatal
+
+object CatalogUtils {
+
+  def buildExternalCatalog(conf: SparkConf, hadoopConf: Configuration): ExternalCatalog = {
+    val externalCatalogClassName =
+      if (SparkSession.active.conf.get(CATALOG_IMPLEMENTATION.key).equals("hive")) {
+        "org.apache.spark.sql.hive.HiveExternalCatalog"
+      } else {
+        "org.apache.spark.sql.catalyst.catalog.InMemoryCatalog"
+      }
+    reflect[ExternalCatalog, SparkConf, Configuration](externalCatalogClassName, conf, hadoopConf)
+  }
+
+  private def reflect[T, Arg1 <: AnyRef, Arg2 <: AnyRef](
+      className: String,
+      ctorArg1: Arg1,
+      ctorArg2: Arg2)(implicit ctorArgTag1: ClassTag[Arg1], ctorArgTag2: ClassTag[Arg2]): T = {
+    try {
+      val clazz = Utils.classForName(className)
+      val ctor = clazz.getDeclaredConstructor(ctorArgTag1.runtimeClass, ctorArgTag2.runtimeClass)
+      val args = Array[AnyRef](ctorArg1, ctorArg2)
+      ctor.newInstance(args: _*).asInstanceOf[T]
+    } catch {
+      case NonFatal(e) =>
+        throw new IllegalArgumentException(s"Error while instantiating '$className':", e)
+    }
+  }
+
+}