From 62387c464fe4e9ea605683a3a041f7e31fb723fd Mon Sep 17 00:00:00 2001
From: Weijie Guo <reswqa@163.com>
Date: Mon, 15 Apr 2024 18:58:15 +0800
Subject: [PATCH] refactor

---
 crates/polars-core/src/frame/group_by/mod.rs | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/crates/polars-core/src/frame/group_by/mod.rs b/crates/polars-core/src/frame/group_by/mod.rs
index 0240b4a023d3..438c3c24fd74 100644
--- a/crates/polars-core/src/frame/group_by/mod.rs
+++ b/crates/polars-core/src/frame/group_by/mod.rs
@@ -76,16 +76,14 @@ impl DataFrame {
                 .cloned()
                 .collect::<Vec<_>>();
             if by.is_empty() {
-                Ok(if self.height() == 0 {
-                    GroupsProxy::Slice {
-                        groups: vec![],
-                        rolling: false,
-                    }
+                let groups = if self.height() == 0 {
+                    vec![]
                 } else {
-                    GroupsProxy::Slice {
-                        groups: vec![[0, self.height() as IdxSize]],
-                        rolling: false,
-                    }
+                    vec![[0, self.height() as IdxSize]]
+                };
+                Ok(GroupsProxy::Slice {
+                    groups,
+                    rolling: false,
                 })
             } else {
                 let rows = if multithreaded {