fix: assert correct column number

Author: richtia

python/datafusion/tests/test_functions.py

@@ -574,7 +574,7 @@ def test_string_functions(df):
     assert result.column(25) == pa.array(["Helll", "Wldld", "!"])
     assert result.column(26) == pa.array(["hello", "world", "!"])
     assert result.column(27) == pa.array(["HELLO ", " WORLD ", " !"])
-    assert result.column(22) == pa.array([True, False, False])
+    assert result.column(28) == pa.array([True, False, False])
 
 
 def test_hash_functions(df):