metesynnada opened a new issue, #3964:
URL: https://github.com/apache/arrow-datafusion/issues/3964
**Describe the bug**
While converting DFSchema to Schema, field metadata is not preserved. It may
cause future bugs on methods like `alias`.
**To Reproduce**
Create a `DFSchema` that has fields with metadata.
```rust
let mut a: DFField = DFField::new(Some("table1"), "a", DataType::Int64,
false);
let mut b: DFField = DFField::new(Some("table1"), "b", DataType::Int64,
false);
let mut a_metadata = BTreeMap::new();
a_metadata.insert("key".to_string(), "value".to_string());
a.field.set_metadata(Some(a_metadata));
let mut b_metadata = BTreeMap::new();
b_metadata.insert("key".to_string(), "value".to_string());
b.field.set_metadata(Some(b_metadata));
let df_schema = Arc::new(
DFSchema::new_with_metadata(
[a, b].to_vec(),
HashMap::new(),
)
.unwrap(),
);
let schema: Schema = df_schema.as_ref().clone().into();
let a_df = df_schema.fields.get(0).unwrap().field();
let a_arrow = schema.fields.get(0).unwrap();
assert_eq!(a_df.metadata(), a_arrow.metadata())
```
**Expected behavior**
Fields preserve the metadata.
**Additional context**
It will be solved by changing `From<DFSchema> for Schema` method.
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