cuibo01 commented on a change in pull request #17332:
URL: https://github.com/apache/flink/pull/17332#discussion_r713626650



##########
File path: 
flink-connectors/flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/dialect/JdbcDialect.java
##########
@@ -142,4 +143,16 @@
      */
     String getSelectFromStatement(
             String tableName, String[] selectFields, String[] conditionFields);
+
+    /** Create catalog instance. */
+    default AbstractJdbcCatalog createCatalog(

Review comment:
       thx for your review... 
   yes, u are right. If we add new interface, we need to modify a lot code. I 
think the current way might be better than modifying a lot of code.




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