HaoYang670 commented on issue #1623:
URL:
https://github.com/apache/arrow-datafusion/issues/1623#issuecomment-1032191893
It seems like there is a `List(None, _)` in the `states`:
```rust
let col_values = states
.iter()
.map(|state| match state {
ScalarValue::List(Some(values), _) => Ok(values),
_ => Err(DataFusionError::Internal(format!(
"Unexpected accumulator state {:?}",
state
))),
})
.collect::<Result<Vec<_>>>()?;
```
https://github.com/apache/arrow-datafusion/blob/master/datafusion/src/physical_plan/expressions/distinct_expressions.rs#L148-L157
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