r4ntix opened a new issue, #3901:
URL: https://github.com/apache/arrow-datafusion/issues/3901
**Describe the bug**
Serialize and Deserialize with `Substring(str [from int] [for int])`:
```rust
// substr(string, position, count)
let test_expr_with_count = Expr::ScalarFunction {
fun: Substr,
args: vec![col("col"), lit(1_i64), lit(1_i64)],
};
let ctx = SessionContext::new();
roundtrip_expr_test(test_expr_with_count, ctx);
```
Failed:
```
assertion failed: `(left == right)`
left: `"substr(col, Int64(1), Int64(1))"`,
right: `"substr(col, Int64(1))"`
```
This problem was found in arrow-ballista's benchmarks test:
https://github.com/apache/arrow-ballista/issues/375
**To Reproduce**
👆
**Expected behavior**
A clear and concise description of what you expected to happen.
**Additional context**
Add any other context about the problem here.
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