andygrove opened a new issue, #3302:
URL: https://github.com/apache/arrow-datafusion/issues/3302
**Describe the bug**
datafusion-proto does not support untyped null scalar values
**To Reproduce**
```rust
#[test]
fn roundtrip_null_literal() {
let test_expr = Expr::Literal(ScalarValue::Null);
let ctx = SessionContext::new();
roundtrip_expr_test(test_expr, ctx);
}
```
**Expected behavior**
Should work
**Additional context**
None
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