Github user suez1224 commented on the issue:
https://github.com/apache/flink/pull/5367
@hequn8128 @twalthr could you please take another look? I've refactored the
code to reuse the generateFieldAccess() code, also added null test. Nested
tuple wont work now due to https://issues.apache.org/jira/browse/CALCITE-2162.
I've submitted a PR to fix it in Calcite.---
