diff --git a/duckdb/experimental/spark/sql/dataframe.py b/duckdb/experimental/spark/sql/dataframe.py
index 83b2dd09..1dae6662 100644
--- a/duckdb/experimental/spark/sql/dataframe.py
+++ b/duckdb/experimental/spark/sql/dataframe.py
@@ -38,8 +38,26 @@ def __init__(self, relation: duckdb.DuckDBPyRelation, session: "SparkSession") -
         if self.relation is not None:
             self._schema = duckdb_to_spark_schema(self.relation.columns, self.relation.types)
 
-    def show(self, **kwargs) -> None:  # noqa: D102
-        self.relation.show()
+    def show(
+        self,
+        n: int = 20,
+        truncate: Union[bool, int] = True,
+        vertical: bool = False,
+    ) -> None:  # noqa: D102
+        if isinstance(truncate, int):
+            max_col_width = truncate
+        elif truncate:
+            max_col_width = 20
+        else:
+            max_col_width = 9999
+
+        render_mode = 'COLUMNS' if vertical else None
+
+        self.relation.show(
+            max_rows=n,
+            max_col_width=max_col_width,
+            render_mode=render_mode
+        )
 
     def toPandas(self) -> "PandasDataFrame":  # noqa: D102
         return self.relation.df()
diff --git a/duckdb/experimental/spark/sql/udf.py b/duckdb/experimental/spark/sql/udf.py
index c22f6be9..95f32500 100644
--- a/duckdb/experimental/spark/sql/udf.py
+++ b/duckdb/experimental/spark/sql/udf.py
@@ -23,7 +23,13 @@ def register(  # noqa: D102
         f: "Callable[..., Any] | UserDefinedFunctionLike",
         returnType: Optional["DataTypeOrString"] = None,
     ) -> "UserDefinedFunctionLike":
-        self.sparkSession.conn.create_function(name, f, return_type=returnType)
+        self.sparkSession.conn.create_function(
+            name,
+            f,
+            None,
+            return_type=returnType.duckdb_type if returnType else None,
+            null_handling='special',  # PySpark UDFs handle nulls
+        )
 
     def registerJavaFunction(  # noqa: D102
         self,
diff --git a/external/duckdb b/external/duckdb
index 3a3c412a..a7378a20 160000
--- a/external/duckdb
+++ b/external/duckdb
@@ -1 +1 @@
-Subproject commit 3a3c412af5b55b6d4e33686732a8110b9bf03542
+Subproject commit a7378a20fd7505773ebe76c06bc2b77a2d7ef184