def get_df_replicas_j_dids(df_replicas, df_dids_files):
    """Left join of df_replicas and df_dids_files to fill the RSE_ID, fsize and accessed_at, created_at for all files.

    Be aware that there are 2 columns for each fsize, accessed_at, created_at
    They will be combined in get_df_file_rse_ts_size

    Columns:
        comes from DID:       file, dids_accessed_at, dids_created_at, fsize_dids,
        comes from REPLICAS:  file, rse_id, fsize_replicas, rep_accessed_at, rep_created_at
   """
    return df_replicas.join(df_dids_files, ["file"], how="left").cache()