From 8c9246ea4b13e61fcc3bdca2b896075e9276d7f4 Mon Sep 17 00:00:00 2001
From: FBruzzesi <francesco.bruzzesi.93@gmail.com>
Date: Thu, 26 Sep 2024 22:53:46 +0200
Subject: [PATCH] fix: pyarrow group_by unique

---
 narwhals/_arrow/group_by.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/narwhals/_arrow/group_by.py b/narwhals/_arrow/group_by.py
index 6c7b20485..27757dff8 100644
--- a/narwhals/_arrow/group_by.py
+++ b/narwhals/_arrow/group_by.py
@@ -20,6 +20,7 @@
     "n_unique": "count_distinct",
     "std": "stddev",
     "var": "variance",  # currently unused, we don't have `var` yet
+    "unique": "distinct",
 }
 
 
@@ -32,6 +33,7 @@ def get_function_name_option(function_name: str) -> Any | None:
         "count_distinct": pc.CountOptions(mode="all"),
         "stddev": pc.VarianceOptions(ddof=1),
         "variance": pc.VarianceOptions(ddof=1),
+        "distinct": pc.CountOptions(mode="all"),
     }
     return function_name_to_options.get(function_name)