[jOOQ/jOOQ#13591] Add a new ColumnElement type

jOOQ/src/main/java/org/jooq/ColumnElement.java

@@ -0,0 +1,57 @@
+/*
+ * 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.
+ *
+ * Other licenses:
+ * -----------------------------------------------------------------------------
+ * Commercial licenses for this work are available. These replace the above
+ * ASL 2.0 and offer limited warranties, support, maintenance, and commercial
+ * database integrations.
+ *
+ * For more information, please visit: http://www.jooq.org/licenses
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ */
+package org.jooq;
+
+/**
+ * A common base type for {@link Comment} and other, potential future types
+ * where DSL API accepts all types alike.
+ * <p>
+ * This is useful for DDL statements.
+ * <p>
+ * Instances of this type cannot be created directly, only of its subtypes.
+ *
+ * @author Lukas Eder
+ */
+public /* sealed */ interface ColumnElement
+extends
+    QueryPart
+/* permits
+    Comment */ 
+{
+
+}

jOOQ/src/main/java/org/jooq/Comment.java

@@ -66,7 +66,7 @@ import org.jetbrains.annotations.ApiStatus.Experimental;
  *
  * @author Lukas Eder
  */
-public interface Comment extends QueryPart {
+public /* non-sealed */ interface Comment extends ColumnElement {
 
     /**
      * Get the comment.