[GitHub] [arrow] AlenkaF commented on a diff in pull request #12863: ARROW-11259: [Python] Allow to create field reference to nested field

[GitBox <gi...@apache.org>]

AlenkaF commented on code in PR #12863:
URL: https://github.com/apache/arrow/pull/12863#discussion_r848475601


##########
python/pyarrow/compute.py:
##########
@@ -597,16 +597,29 @@ def field(name_or_index):
     Stores only the field's name. Type and other information is known only when
     the expression is bound to a dataset having an explicit scheme.
 
+    Nested references are allowed by passing a tuple of names.
+    For example ``('foo', 'bar')`` references the field named "bar" inside
+    the field named "foo".
+
     Parameters
     ----------
-    name_or_index : string or int
-        The name or index of the field the expression references to.
+    name_or_index : string, tuple or int
+        The name or index of the (possibly nested) field the expression
+        references to.
 
     Returns
     -------
     field_expr : Expression
     """
-    return Expression._field(name_or_index)
+    if isinstance(name_or_index, str) or isinstance(name_or_index, int):

Review Comment:
   🤩 



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