Introduce indexer level bumpalo

milli/src/fields_ids_map/global.rs

@@ -1,6 +1,8 @@
 use std::collections::BTreeMap;
 use std::sync::RwLock;
 
+use super::MutFieldIdMapper;
+use crate::documents::FieldIdMapper;
 use crate::{FieldId, FieldsIdsMap};
 
 /// A fields ids map that can be globally updated to add fields
@@ -11,11 +13,21 @@ pub struct GlobalFieldsIdsMap<'indexing> {
 }
 
 #[derive(Debug, Clone)]
-struct LocalFieldsIdsMap {
+pub struct LocalFieldsIdsMap {
     names_ids: BTreeMap<String, FieldId>,
     ids_names: BTreeMap<FieldId, String>,
 }
 
+impl FieldIdMapper for LocalFieldsIdsMap {
+    fn id(&self, name: &str) -> Option<FieldId> {
+        self.id(name)
+    }
+
+    fn name(&self, id: FieldId) -> Option<&str> {
+        self.name(id)
+    }
+}
+
 impl LocalFieldsIdsMap {
     fn new(global: &RwLock<FieldsIdsMap>) -> Self {
         let global = global.read().unwrap();
@@ -83,4 +95,14 @@ impl<'indexing> GlobalFieldsIdsMap<'indexing> {
 
         self.local.name(id)
     }
+
+    pub fn local_map(&self) -> &LocalFieldsIdsMap {
+        &self.local
+    }
+}
+
+impl<'indexing> MutFieldIdMapper for GlobalFieldsIdsMap<'indexing> {
+    fn insert(&mut self, name: &str) -> Option<FieldId> {
+        self.id_or_insert(name)
+    }
 }