alamb opened a new issue #1623:
URL: https://github.com/apache/arrow-datafusion/issues/1623
**Describe the bug**
A query returns this error:
```
ArrowError(ExternalError(Internal("Unexpected accumulator state
List([NULL])")))
```
**To Reproduce**
Download and extract
[data.zip](https://github.com/apache/arrow-datafusion/files/7908494/data.zip)
```shell
cargo run --bin datafusion-cli
Finished dev [unoptimized + debuginfo] target(s) in 0.93s
Running `target/debug/datafusion-cli`
DataFusion CLI v5.1.0
❯ create external table stops stored as parquet location '2021-11.parquet';
0 rows in set. Query took 0.010 seconds.
❯ select count(*), count(distinct stop_name), trip_tid from stops group by
trip_tid limit 10;
ArrowError(ExternalError(Internal("Unexpected accumulator state
List([NULL])")))
**Expected behavior**
A result
**Additional context**
Add any other context about the problem here.
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