diff --git a/scripts/preprocessing/collect_code_metadata.py b/scripts/preprocessing/collect_code_metadata.py
index 514e871..191894f 100755
--- a/scripts/preprocessing/collect_code_metadata.py
+++ b/scripts/preprocessing/collect_code_metadata.py
@@ -8,6 +8,7 @@
 
 import hydra
 import polars as pl
+import polars.selectors as cs
 from loguru import logger
 from omegaconf import DictConfig, OmegaConf
 
@@ -79,7 +80,10 @@ def main(cfg: DictConfig):
     logger.info("All map shards complete! Starting code metadata reduction computation.")
     reducer_fn = reducer_fntr(cfg.stage_cfg, cfg.get("code_modifier_columns", None))
 
-    reduced = reducer_fn(*[pl.scan_parquet(fp, glob=False) for fp in all_out_fps])
+    reduced = (
+        reducer_fn(*[pl.scan_parquet(fp, glob=False) for fp in all_out_fps])
+        .with_columns(cs.is_numeric().shrink_dtype().keep_name())
+    )
     write_lazyframe(reduced, output_dir / "code_metadata.parquet")
     logger.info(f"Finished reduction in {datetime.now() - start}")