pshampanier opened a new issue, #6700:
URL: https://github.com/apache/arrow-rs/issues/6700
**Describe the bug**
When calling `arrow_integration_test::schema_to_json(schema)` metadata at
the field level are not serialized.
**To Reproduce**
```rust
#[cfg(test)]
mod tests {
use arrow_integration_test::schema_to_json;
use arrow_schema::{DataType, Field, Schema};
use std::collections::HashMap;
#[test]
fn test_schema_to_json() {
let metadata = [("key1".to_string(),
"value1".to_string())].iter().cloned().collect::<HashMap<_, _>>();
let fields = vec![Field::new("a", DataType::Int32,
true).with_metadata(metadata.clone())];
let schema = Schema::new(fields).with_metadata(metadata.clone());
let json = schema_to_json(&schema);
assert_eq!(
serde_json::to_string_pretty(&json).unwrap(),
serde_json::to_string_pretty(&serde_json::json!({
"fields": [
{
"name": "a",
"nullable": true,
"type": {
"bitWidth": 32,
"isSigned": true,
"name": "int"
},
"children": [],
"metadata": {
"key1": "value1"
},
},
],
"metadata": {
"key1": "value1"
},
}))
.unwrap()
);
}
}
```
**Expected behavior**
Expected:
```json
{
"fields": [
{
"children": [],
"metadata": {
"key1": "value1"
},
"name": "a",
"nullable": true,
"type": {
"bitWidth": 32,
"isSigned": true,
"name": "int"
}
}
],
"metadata": {
"key1": "value1"
}
}
```
Found:
```json
{
"fields": [
{
"children": [],
"name": "a",
"nullable": true,
"type": {
"bitWidth": 32,
"isSigned": true,
"name": "int"
}
}
],
"metadata": {
"key1": "value1"
}
}
```
The `metadata` key is available at the schema level but missing for fields.
**Additional context**
Tested with `arrow version = "53.1.0"`
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