jorisvandenbossche commented on code in PR #36846:
URL: https://github.com/apache/arrow/pull/36846#discussion_r1303213849


##########
python/pyarrow/types.pxi:
##########
@@ -3186,12 +3231,26 @@ def unify_schemas(schemas):
     """
     cdef:
         Schema schema
+        CField.CMergeOptions c_options
         vector[shared_ptr[CSchema]] c_schemas
     for schema in schemas:
         if not isinstance(schema, Schema):
             raise TypeError("Expected Schema, got {}".format(type(schema)))
         c_schemas.push_back(pyarrow_unwrap_schema(schema))
-    return pyarrow_wrap_schema(GetResultValue(UnifySchemas(c_schemas)))
+    if isinstance(options, str):
+        if options == "default":
+            c_options = CField.CMergeOptions.Defaults()
+        elif options == "permissive":
+            c_options = CField.CMergeOptions.Permissive()
+        else:
+            raise ValueError(f"Invalid merge option: {options}")
+
+    elif c_options:

Review Comment:
   ```suggestion
       elif options:
   ```



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