andygrove opened a new issue, #3318:
URL: https://github.com/apache/arrow-datafusion/issues/3318
**Is your feature request related to a problem or challenge? Please describe
what you are trying to do.**
```
"/home/andy/git/apache/arrow-datafusion/datafusion/proto/build.rs":33
let descriptor_path =
std::path::PathBuf::from(std::env::var("OUT_DIR").unwrap())
"/home/andy/git/apache/arrow-datafusion/datafusion/proto/build.rs":43
let descriptor_set = std::fs::read(descriptor_path).unwrap();
"/home/andy/git/apache/arrow-datafusion/datafusion/proto/build.rs":46
.unwrap()
"/home/andy/git/apache/arrow-datafusion/datafusion/proto/src/bytes/mod.rs":140
let back: protobuf::LogicalPlanNode = serde_json::from_str(json).unwrap();
"/home/andy/git/apache/arrow-datafusion/datafusion/proto/src/from_proto.rs":381
.unwrap()
"/home/andy/git/apache/arrow-datafusion/datafusion/proto/src/from_proto.rs":384
.unwrap()
"/home/andy/git/apache/arrow-datafusion/datafusion/proto/src/from_proto.rs":573
field_names.last().unwrap().as_str(),
"/home/andy/git/apache/arrow-datafusion/datafusion/proto/src/from_proto.rs":678
field_names.last().unwrap(),
"/home/andy/git/apache/arrow-datafusion/datafusion/proto/src/from_proto.rs":1317
panic!("Expected a Vec of length {} but it was {}", N, v.len())
"/home/andy/git/apache/arrow-datafusion/datafusion/proto/src/logical_plan.rs":418
.map(|p| ListingTableUrl::parse(p).unwrap())
"/home/andy/git/apache/arrow-datafusion/datafusion/proto/src/logical_plan.rs":656
let mut builder =
LogicalPlanBuilder::from(input_plans.pop().unwrap());
"/home/andy/git/apache/arrow-datafusion/datafusion/proto/src/to_proto.rs":227
unimplemented!("The Decimal256 data type is not yet supported")
"/home/andy/git/apache/arrow-datafusion/datafusion/proto/src/to_proto.rs":230
unimplemented!("The Map data type is not yet supported")
"/home/andy/git/apache/arrow-datafusion/datafusion/proto/src/to_proto.rs":561
Expr::ScalarVariable(_, _) => unimplemented!(),
"/home/andy/git/apache/arrow-datafusion/datafusion/proto/src/to_proto.rs":769
unimplemented!("subquery expressions are not supported yet")
"/home/andy/git/apache/arrow-datafusion/datafusion/proto/src/to_proto.rs":814
Expr::QualifiedWildcard { .. } | Expr::TryCast { .. } =>
unimplemented!(),
"/home/andy/git/apache/arrow-datafusion/datafusion/proto/src/to_proto.rs":911
todo!("Proper error handling {}", unsupported)
```
**Describe the solution you'd like**
Use `Result` instead.
**Describe alternatives you've considered**
None
**Additional context**
Generated by https://github.com/andygrove/no-need-to-panic
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