ahmedriza opened a new issue, #5323:
URL: https://github.com/apache/arrow-datafusion/issues/5323
**Describe the bug**
The protobuf serialisation is missing for `GetIndexedFieldExpr` which causes
`ballista` to fail to execute SQL queries that index fields of nested types.
**To Reproduce**
Use the attached parquet file:
and run the following code
```rust
#[tokio::test]
async fn test_ballista_sql() {
let config = BallistaConfig::builder().build().unwrap();
let ctx = BallistaContext::standalone(&config, 10).await.unwrap();
ctx.register_parquet("t", "list.parquet",
ParquetReadOptions::default()).await.unwrap();
let df = ctx.sql("select id, a[1], a[2], a[3] from t").await.unwrap();
df.show().await.unwrap();
}
```
This will fail with
```
Error: Arrow error: External error: Execution error: Job F5d0DAb failed:
Error planning job F5d0DAb: DataFusionError(Internal("physical_plan::to_proto()
unsupported expression GetIndexedFieldExpr { arg: Column { name: \"a\", index:
0 }, key: Int64(1) }"))
```
**Expected behavior**
Should produce the following output:
```
+----+--------+--------+--------+
| id | t.a[1] | t.a[2] | t.a[3] |
+----+--------+--------+--------+
| 1 | 1.71 | 2.71 | 3.71 |
+----+--------+--------+--------+
```
**Additional context**
This is due to the missing protobuf serialisations for `GetIndexedFieldExpr`
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