Github user dianfu commented on the issue:
https://github.com/apache/flink/pull/4373
I have did some investigation of the test failure of
**JoinITCase.testJoinWithExpressionPreds** and would like to share my findings
and solutions for your reference. The cause of this issue is that for preserved
expressions, in **PushProjector#createProjectRefsAndExprs**, the column names
corresponding to them will be the operator names of the expressions. For
example for expression **a - 1** in the test case, the column corresponding to
it will be **-**. I think this behavior is not expected and have copied
**PushProjector** from calcite and made some changes to it (line 507). Please
refer to
[here](https://github.com/dianfu/flink/commit/efa9641e0bd395a3679b0d496b60e3d42aa7b832)
for more information.
For the files copied from calcite, all files can be removed except
**SqlTimestampAddFunction** and **AuxiliaryConverter**.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---
