goldmedal opened a new issue, #10652:
URL: https://github.com/apache/datafusion/issues/10652
### Is your feature request related to a problem or challenge?
We only support to convert JOIN with `ON` constraint to SQL String now. The
SQL as below can't be converted now.
```
SELECT * FROM orders JOIN customer USING (custkey)
```
It will panic with the message:
```
NotImplemented("Unsupported join constraint: Using")
```
### Describe the solution you'd like
The unparse rule for `JOIN` in `datafusion/sql/src/unparser/plan.rs` should
be implemented.
https://github.com/apache/datafusion/blob/8bedecc00b2f1f04d7b1a907152ce0d19b7046a5/datafusion/sql/src/unparser/plan.rs#L277-L285
### Describe alternatives you've considered
_No response_
### Additional context
_No response_
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