[#3162] NullPointerException when referencing window name that was not declared

jOOQ/src/main/java/org/jooq/impl/Function.java

@@ -367,11 +367,19 @@ class Function<T> extends AbstractField<T> implements
             Map<Object, Object> map = (Map<Object, Object>) ctx.data(DATA_LOCALLY_SCOPED_DATA_MAP);
             QueryPartList<WindowDefinition> windows = (QueryPartList<WindowDefinition>) map.get(DATA_WINDOW_DEFINITIONS);
 
-            for (WindowDefinition window : windows) {
-                if (((WindowDefinitionImpl) window).getName().equals(windowName)) {
-                    return window;
+            if (windows != null) {
+                for (WindowDefinition window : windows) {
+                    if (((WindowDefinitionImpl) window).getName().equals(windowName)) {
+                        return window;
+                    }
                 }
             }
+
+            // [#3162] If a window specification is missing from the query's WINDOW clause,
+            // jOOQ should just render the window name regardless of the SQL dialect
+            else {
+                return windowName;
+            }
         }
 
         return null;

jOOQ/src/test/java/org/jooq/test/ExceptionsTest.java

@@ -0,0 +1,66 @@
+/**
+ * Copyright (c) 2009-2014, Data Geekery GmbH (http://www.datageekery.com)
+ * All rights reserved.
+ *
+ * This work is dual-licensed
+ * - under the Apache Software License 2.0 (the "ASL")
+ * - under the jOOQ License and Maintenance Agreement (the "jOOQ License")
+ * =============================================================================
+ * You may choose which license applies to you:
+ *
+ * - If you're using this work with Open Source databases, you may choose
+ *   either ASL or jOOQ License.
+ * - If you're using this work with at least one commercial database, you must
+ *   choose jOOQ License
+ *
+ * For more information, please visit http://www.jooq.org/licenses
+ *
+ * Apache Software License 2.0:
+ * -----------------------------------------------------------------------------
+ * Licensed 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.
+ *
+ * jOOQ License and Maintenance Agreement:
+ * -----------------------------------------------------------------------------
+ * Data Geekery grants the Customer the non-exclusive, timely limited and
+ * non-transferable license to install and use the Software under the terms of
+ * the jOOQ License and Maintenance Agreement.
+ *
+ * This library is distributed with a LIMITED WARRANTY. See the jOOQ License
+ * and Maintenance Agreement for more details: http://www.jooq.org/licensing
+ */
+package org.jooq.test;
+
+import static org.jooq.impl.DSL.count;
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+/**
+ * Common tests related to jOOQ's exception handling
+ *
+ * @author Lukas Eder
+ */
+public class ExceptionsTest extends AbstractTest {
+
+    @Test
+    public void testMissingWindowSpecification() {
+
+        // [#3162] If a window specification is missing from the query's WINDOW clause,
+        // jOOQ should just render the window name regardless of the SQL dialect
+        assertTrue(
+            create.select(count().over("window"))
+                  .getSQL()
+                  .contains("over (`window`)")
+        );
+    }
+}