ZENOTME commented on issue #1202:
URL: https://github.com/apache/iceberg-rust/issues/1202#issuecomment-2798502790
Hi @hugokitano, seems this example uses the map type in the wrong way.
```
// Create the key_value field with metadata
let mut key_value_metadata = HashMap::new();
key_value_metadata.insert(PARQUET_FIELD_ID_META_KEY.to_string(),
"3".to_string());
let key_value_field = Field::new(
"struct",
arrow_schema::DataType::Struct(vec![
Arc::new(key_field.clone()),
Arc::new(value_field.clone()),
].into()),
false
).with_metadata(key_value_metadata.clone());
```
should be
```
// Create the key_value field with metadata
// let mut key_value_metadata = HashMap::new();
// key_value_metadata.insert(PARQUET_FIELD_ID_META_KEY.to_string(),
"3".to_string());
let key_value_field = Field::new(
DEFAULT_MAP_FIELD_NAME,
arrow_schema::DataType::Struct(vec![
Arc::new(key_field.clone()),
Arc::new(value_field.clone()),
].into()),
false
);
```
In iceberg, it doesn't have the concept of key_value field I think. This
field is used for the arrow to represent map array(Because it represent map as
array of struct):
1. The key value field name should be "key_value".
2. key value field don't need to have field id.
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