jamesmcm opened a new issue, #10639:
URL: https://github.com/apache/datafusion/issues/10639
### Is your feature request related to a problem or challenge?
This job in Ballista fails:
```rust
let avro_file = "gs://...";
let metadata_df = ctx
.read_avro(avro_file, AvroReadOptions::default())
.await?
.select(vec![col("id"), col("nested_array")])?
.unnest_column("nested_array")?
```
```
Error: DataFusionError(Internal("failed to serialize logical plan:
Internal(\"LogicalPlan serde is not yet implemented for Unnest\")"))
```
Due to the lack of ProtoBuf serialisation here -
https://github.com/apache/datafusion/blob/main/datafusion/proto/src/logical_plan/mod.rs#L1527-L1529
### Describe the solution you'd like
ProtoBuf Serialisation would be added so that Unnest will be usable in
Ballista jobs.
### Describe alternatives you've considered
I also couldn't get taking just the head to work:
```rust
let metadata_df = ctx
.read_avro(avro_file, AvroReadOptions::default())
.await?
.select(vec![
col("id"),
col("nested_array")
.index(lit(1)) // Note index starts at 1
.field("array_id_1")
.alias("array_id_1"),
col("nested_array")
.index(lit(1))
.field("array_id_2")
.alias("array_id_2"),
])?;
```
which gave:
```
Error: DataFusionError(Plan("Only ints are valid as an indexed field in a
list"))
```
But really unnesting support is needed anyway.
### Additional context
_No response_
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