gabotechs opened a new issue, #1838:
URL: https://github.com/apache/datafusion-ballista/issues/1838
## What happened
Q9 fails at stage 17 with an `InvalidArgumentError` inside `BatchCoalescer`:
the coalescer was constructed expecting 0 columns but receives a batch with 1
column.
## Error message
```
ArrowError(InvalidArgumentError("Batch has 1 columns but BatchCoalescer
expects 0"))
```
Full chain:
```
DataFusionError(Execution("DataFusionError(Shared(Shared(Shared(Shared(Shared(Shared(Shared(Shared(
Shared(Shared(Shared(Shared(Shared(Shared(ArrowError(InvalidArgumentError(
\"Batch has 1 columns but BatchCoalescer expects 0\"),
Some(\"\")))))))))))))))))"))
```
## How to reproduce
Reproduced by running the remote benchmarks with the Ballista engine in
https://github.com/datafusion-contrib/datafusion-distributed, but it probably
can be reproduced more easily.
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