guimingyue commented on issue #8284: URL: https://github.com/apache/shardingsphere/issues/8284#issuecomment-737624290
> @guimingyue @tristaZero > I fix it. > [tristaZero/federatedSQL#2](https://github.com/tristaZero/federatedSQL/pull/2) @junwen12221 I add the VM options you mentioned in https://github.com/tristaZero/federatedSQL/pull/2，and I found the line throwed the NPE，It‘s `root.getRootSchema().getSubSchema("sharding").getTable("t_order")`。 @tristaZero This is because the sharding sub schema you defined in the constructor method `CalciteRowExecutor` is assigned to `CalciteRawExecutor#schema` field。Then the `DataContext` object with the same sub schema is binded to `executablePlan`，so, this invocation `root.getRootSchema()` in generated code returned the sharding sub schema which does not have any sub schema. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected]
