Expose inner file slice

src/core/segment_reader.rs

@@ -128,7 +128,8 @@ impl SegmentReader {
         })
     }
 
-    pub(crate) fn fieldnorms_readers(&self) -> &FieldNormReaders {
+    #[doc(hidden)]
+    pub fn fieldnorms_readers(&self) -> &FieldNormReaders {
         &self.fieldnorm_readers
     }
 

src/fieldnorm/reader.rs

@@ -40,6 +40,11 @@ impl FieldNormReaders {
     pub fn space_usage(&self) -> PerFieldSpaceUsage {
         self.data.space_usage()
     }
+
+    /// Returns a handle to inner file
+    pub fn get_inner_file(&self) -> Arc<CompositeFile> {
+        self.data.clone()
+    }
 }
 
 /// Reads the fieldnorm associated to a document.