Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/17425
It sounds like the codegen version has a bug. It did not respect the
following logics:
```
* @param outer when true, each input row will be output at least once,
even if the output of the
* given `generator` is empty. `outer` has no effect when
`join` is false.
```
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