vincev opened a new pull request, #7300:
URL: https://github.com/apache/arrow-datafusion/pull/7300
## Which issue does this PR close?
Closes #7299.
## Rationale for this change
When unnesting a list array created by `array_agg` aggregation fails with
error:
```
ArrowError(ComputeError("concat requires input of at least one array"))
```
This PR adds code to prevent `concat` from being called with an empty array
during unnesting.
## What changes are included in this PR?
This PR adds code to prevent `concat` from being called with an empty array
during unnesting.
This PR also removes the `list_lengths` workaround fixed in [arrow
#4517](https://github.com/apache/arrow-rs/issues/4517).
## Are these changes tested?
Yes added a test for the failing scenario.
## Are there any user-facing changes?
No
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