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_r373938135
##########
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:
After some research of the code, i found another solution, that is:
- Modify the FlinkRelBuilder to add a new method `scan(Iterable<String>
tableNames, ViewExpander viewExpander)`, then in the method, fetch the
`RelOptTable` first and then do the logic same with `TableScanRule`
- In the `QueryOperationConverter`, use the new `scan` method to translate
the table
- No other code change is needed
We do not need to pass the `SqlToExprConverter` around through the
`FlinkContext` because the it does not belong there, the computed
column/watermark translation should happen as early as possible and not in
planner rules.
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