YjyJeff opened a new issue, #9591:
URL: https://github.com/apache/arrow-datafusion/issues/9591
### Is your feature request related to a problem or challenge?
When we use unnest, we may use it as a subexpression, for example:
```
select unnest(array_remove(col, 1)) as a from unnest_table;
```
Currently, datafusion does not support it and will report a bug.
### Describe the solution you'd like
Translate the unnest function to the following pattern:
```
Projection expr_to_execute_the_parent_expr_of_unnest
Unnest unnest_column
Projection expr_to_execute_the_child_expr_of_unnest
```
For example, above SQL will be translated to:
```
Projection Alias(unnest(array_remove(col, 1)), a)
Unnest unnest(array_remove(col,1))
Projection array_remove(col, 1) as unnest(array_remove(col, 1))
```
### Describe alternatives you've considered
_No response_
### Additional context
_No response_
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