[core][flink] Support view operations in JDBC Catalog

docs/docs/concepts/views.md

@@ -36,6 +36,8 @@ View metadata is persisted only when the catalog implementation supports it:
 - **Hive metastore catalog** – view metadata is stored together with table metadata inside the
   metastore warehouse.
 - **REST catalog** – view metadata is kept in the REST backend and exposed through the catalog API.
+- **JDBC catalog** – view metadata is stored in the catalog database in the `paimon_views`
+  metadata table. The table is created automatically when the JDBC catalog is initialized.
 
 File-system catalogs do not currently support views because they lack persistent metadata storage.
 
@@ -57,6 +59,10 @@ view using their native dialect.
 Use `CREATE VIEW` or `CREATE OR REPLACE VIEW` to register a view. Paimon assigns a UUID, writes the
 first metadata file, and records version `1`.
 
+The catalog stores the view definition. It does not resolve or validate referenced tables when the
+view is created, so missing or cross-database table references are checked by the compute engine when
+the view is queried.
+
 ```sql
 CREATE VIEW sales_view AS
 SELECT region, SUM(amount) AS total_amount

docs/docs/flink/sql-ddl.md

@@ -146,6 +146,18 @@ You can also perform logical isolation for databases under multiple catalogs by
 
 Additionally, when creating a JdbcCatalog, you can specify the maximum length for the lock key by configuring "lock-key-max-length," which defaults to 255. Since this value is a combination of {catalog-key}.{database-name}.{table-name}, please adjust accordingly.
 
+JDBC catalog supports persistent Paimon views. View metadata is stored in the automatically created
+`paimon_views` table in the catalog database. The view SQL is stored as catalog metadata and is not
+resolved when the view is created.
+
+```sql
+CREATE VIEW sales_view AS SELECT name, amount FROM sales WHERE amount > 100;
+
+SHOW VIEWS;
+
+DROP VIEW sales_view;
+```
+
 You can define any default table options with the prefix `table-default.` for tables created in the catalog.
 
 ## Create Table

docs/docs/spark/sql-ddl.md

@@ -103,6 +103,9 @@ Paimon JDBC Catalog in Spark needs to correctly add the corresponding jar packag
 | mysql         | mysql-connector-java | [Download](https://mvnrepository.com/artifact/mysql/mysql-connector-java)  |
 | postgres      | postgresql           | [Download](https://mvnrepository.com/artifact/org.postgresql/postgresql)   |
 
+JDBC catalog supports persistent Paimon views. View metadata is stored in the automatically created
+`paimon_views` table in the catalog database.
+
 ```bash
 spark-sql ... \
     --conf spark.sql.catalog.paimon=org.apache.paimon.spark.SparkCatalog \
@@ -375,7 +378,7 @@ CREATE TABLE target_tbl LIKE source_tbl;
 ## View
 
 Views are based on the result-set of an SQL query, when using `org.apache.paimon.spark.SparkCatalog`, views are managed by paimon itself. 
-And in this case, views are supported when the `metastore` type is `hive` or `rest`.
+And in this case, views are supported when the `metastore` type is `hive`, `rest` or `jdbc`.
 
 ### Create Or Replace View
 

paimon-core/src/main/java/org/apache/paimon/catalog/CachingCatalog.java

@@ -32,6 +32,8 @@
 import org.apache.paimon.table.system.SystemTableLoader;
 import org.apache.paimon.utils.DVMetaCache;
 import org.apache.paimon.utils.SegmentsCache;
+import org.apache.paimon.view.View;
+import org.apache.paimon.view.ViewChange;
 
 import org.apache.paimon.shade.caffeine2.com.github.benmanes.caffeine.cache.Cache;
 import org.apache.paimon.shade.caffeine2.com.github.benmanes.caffeine.cache.Caffeine;
@@ -368,6 +370,40 @@ public void invalidateTable(Identifier identifier) {
         }
     }
 
+    @Override
+    public void createView(Identifier identifier, View view, boolean ignoreIfExists)
+            throws ViewAlreadyExistException, DatabaseNotExistException {
+        wrapped.createView(identifier, view, ignoreIfExists);
+    }
+
+    @Override
+    public View getView(Identifier identifier) throws ViewNotExistException {
+        return wrapped.getView(identifier);
+    }
+
+    @Override
+    public List<String> listViews(String databaseName) throws DatabaseNotExistException {
+        return wrapped.listViews(databaseName);
+    }
+
+    @Override
+    public void dropView(Identifier identifier, boolean ignoreIfNotExists)
+            throws ViewNotExistException {
+        wrapped.dropView(identifier, ignoreIfNotExists);
+    }
+
+    @Override
+    public void renameView(Identifier fromView, Identifier toView, boolean ignoreIfNotExists)
+            throws ViewNotExistException, ViewAlreadyExistException {
+        wrapped.renameView(fromView, toView, ignoreIfNotExists);
+    }
+
+    @Override
+    public void alterView(Identifier view, List<ViewChange> viewChanges, boolean ignoreIfNotExists)
+            throws ViewNotExistException, DialectAlreadyExistException, DialectNotExistException {
+        wrapped.alterView(view, viewChanges, ignoreIfNotExists);
+    }
+
     // ================================== Cache Public API
     // ================================================