ygf11 opened a new issue, #4478:
URL: https://github.com/apache/arrow-datafusion/issues/4478
**Describe the bug**
When I want to project column and the result of its type coercion,
datafusion will throw error:
```sql
❯ select a, cast(a as Int) from test0;
Plan("Projections require unique expression names but the expression
\"test0.a\" at position 0 and \"CAST(test0.a AS Int32)\" at position 3 have the
same name. Consider aliasing (\"AS\") one of them.")
```
**To Reproduce**
Run projection with expression and its cast-wrapped expression.
**Expected behavior**
**Additional context**
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