Commits on May 23, 2024

1. Provide StoreReader::enumerate to simplify creation of secondary indexes …

   For secondary indexes, it is often necessary to read all documents, compute
   some function on them and associated the result with a document ID.
   
   Currently, this requires something like
   
   ```rust
   let reader = segment.get_store_reader(1)?;
   
   for doc_id in segment.doc_ids_alive() {
       let doc = reader.get(doc_id)?;
   
       // Use doc and doc_id here ...
   }
   ```
   
   which can be simplified to
   
   ```rust
   let reader = segment.get_store_reader(1)?;
   
   for res in reader.enumerate() {
       let (doc_id, doc) = res?;
   
       // Use doc and doc_id here ...
   }
   ```
   
   using the method proposed here.
   
   (I added a new method instead of modifying `StoreReader::iter` to make the
   change backwards compatible, i.e. possible to include in a point release.)

   

   adamreichold committed May 23, 2024
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