From cbe2265d3c203c557fb109e804a401b917dffb4b Mon Sep 17 00:00:00 2001
From: Ion Koutsouris <15728914+ion-elgreco@users.noreply.github.com>
Date: Sat, 7 Sep 2024 11:17:03 +0200
Subject: [PATCH] chore: re-enable optional old casting behavior in merge

---
 python/deltalake/table.py | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/python/deltalake/table.py b/python/deltalake/table.py
index fd1e2c1a6d..dc98db2a5a 100644
--- a/python/deltalake/table.py
+++ b/python/deltalake/table.py
@@ -1000,13 +1000,18 @@ def merge(
                 commit_properties, custom_metadata
             )
 
-        if large_dtypes:
+        if large_dtypes is not None:
             warnings.warn(
                 "large_dtypes is deprecated",
                 category=DeprecationWarning,
                 stacklevel=2,
             )
-        conversion_mode = ArrowSchemaConversionMode.PASSTHROUGH
+            if large_dtypes:
+                conversion_mode = ArrowSchemaConversionMode.LARGE
+            else:
+                conversion_mode = ArrowSchemaConversionMode.NORMAL
+        else:
+            conversion_mode = ArrowSchemaConversionMode.PASSTHROUGH
 
         from .schema import (
             convert_pyarrow_dataset,