JingsongLi commented on a change in pull request #10989: 
[FLINK-15840][table-planner-blink] ClassCastException is thrown when use 
tEnv.from for temp/catalog table
URL: https://github.com/apache/flink/pull/10989#discussion_r373919482
 
 

 ##########
 File path: 
flink-table/flink-table-planner-blink/src/main/java/org/apache/flink/table/planner/delegation/PlannerContext.java
 ##########
 @@ -80,13 +82,15 @@
  */
 @Internal
 public class PlannerContext {
+
        private final RelDataTypeSystem typeSystem = new FlinkTypeSystem();
        private final FlinkTypeFactory typeFactory = new 
FlinkTypeFactory(typeSystem);
        private final TableConfig tableConfig;
-       private final RelOptCluster cluster;
        private final FlinkContext context;
        private final CalciteSchema rootSchema;
        private final List<RelTraitDef> traitDefs;
+       private FrameworkConfig frameworkConfig;
+       private RelOptCluster cluster;
 
 Review comment:
   Hi @danny0405 , The constructor of `FrameworkConfig` need cluster context.
   
   Context need a factory which need `FrameworkConfig`. IMO, relationship like 
this is very common. That's one of the reasons we need the factory model.
   I admit we can improve it, but if it's a big refactoring, it's unnecessary, 
because this PR is just an urgent bug fixing.
   Of course, if you have a better and slight improvement plan, you can 
describe it detailed.
   
   What do you think?

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