GitHub user wuchong opened a pull request:
https://github.com/apache/flink/pull/2306
[FLINK-4270] [table] fix 'as' in front of join does not work
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The `Project` has a wrong way to construct RelNode. It pushes a new
`LogicalProject` to the stack, but not pop the previous RelNode. It has problem
when Join two tables.
When join two tables (with all fields renamed), the stack will look like
this before join:
```
LogicalProject1
TableScan1
LogicalProject0
TableScan0
```
After that, join will use `LogicalProject1` and `TableScan1` which are the
same table to create `LogicalJoin`. Then the exception throws.
The correct way to do this is make sure the previous TableScan removed from
the stack before we push a new LogicalProject.
```
LogicalProject1
LogicalProject0
```
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/wuchong/flink FLINK-4270
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/2306.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #2306
----
commit 20412c044103158dabd3de1f7a056018231f9275
Author: Jark Wu <[email protected]>
Date: 2016-07-28T09:33:53Z
[FLINK-4270] [table] fix 'as' in front of join does not work
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