vincev opened a new issue, #7299:
URL: https://github.com/apache/arrow-datafusion/issues/7299
### Describe the bug
When we try to unnest an aggregated list array unnest fails with error:
```
ArrowError(ComputeError("concat requires input of at least one array"))
```
### To Reproduce
Unnesting a column aggregated with `array_agg` fails:
```rust
let results = ctx
.table("shapes")
.await?
.aggregate(
vec![col("shape_id")],
vec![array_agg(col("tag_id")).alias("tag_id")],
)?
.unnest_column("tag_id")?
.collect()
.await?;
```
### Expected behavior
Unnesting should revert the `array_agg` aggregation.
### Additional context
_No response_
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