danny0405 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_r373900358
 
 

 ##########
 File path: 
flink-table/flink-table-planner-blink/src/main/java/org/apache/flink/table/planner/delegation/PlannerContext.java
 ##########
 @@ -80,13 +81,15 @@
  */
 @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 FlinkContextImpl context;
        private final CalciteSchema rootSchema;
 
 Review comment:
   `FlinkContextImpl -> FlinkContext` ?

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