init SchemaWithPartnerVisitor design

Author: ZENOTME

crates/iceberg/src/arrow/schema.rs

@@ -221,7 +221,7 @@ pub fn arrow_type_to_type(ty: &DataType) -> Result<Type> {
 
 const ARROW_FIELD_DOC_KEY: &str = "doc";
 
-fn get_field_id(field: &Field) -> Result<i32> {
+pub(super) fn get_field_id(field: &Field) -> Result<i32> {
     if let Some(value) = field.metadata().get(PARQUET_FIELD_ID_META_KEY) {
         return value.parse::<i32>().map_err(|e| {
             Error::new(