trying yet again to make work for both streaming settings

merfish.py

@@ -78,7 +78,7 @@ class MERFISH(datasets.GeneratorBasedBuilder):
             gene_df = pd.read_parquet(gene_metadata_path)
             cell_df = pd.read_parquet(cell_metadata_path)
 
-        gene_names = gene_df["gene_id"].tolist() if "gene_id" in gene_df.columns else gene_df.index.tolist()
+        gene_names = gene_df["gene_identifier"].tolist() if "gene_identifier" in gene_df.columns else gene_df.index.tolist()
 
         idx = 0
         for filepath in expression_files: