Dandandan commented on issue #1179:
URL:
https://github.com/apache/arrow-datafusion/issues/1179#issuecomment-952997737
The source of the problem is here:
```
SQLExpr::Value(Value::Null) => {
Ok(Expr::Literal(ScalarValue::Utf8(None)))
}
```
I would propose:
* To introduce `ScalarValue::Null` and use that instead for `Value::Null`.
* Return `DataType::Null` as type for `ScalarValue::Null`
* Implement the rest of changes in coercion as needed.
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