From 29d8bb4d39064874546888318bf476f3a0eac175 Mon Sep 17 00:00:00 2001
From: Simon Vandel Sillesen <simon.vandel@gmail.com>
Date: Sat, 30 Oct 2021 22:58:42 +0200
Subject: [PATCH] Only get displayer for the interesting field

---
 src/array/display.rs | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/src/array/display.rs b/src/array/display.rs
index 886f6c1bc79..ef65bb8aa95 100644
--- a/src/array/display.rs
+++ b/src/array/display.rs
@@ -209,14 +209,9 @@ pub fn get_value_display<'a>(array: &'a dyn Array) -> Box<dyn Fn(usize) -> Strin
         }
         Union(_, _, _) => {
             let array = array.as_any().downcast_ref::<UnionArray>().unwrap();
-            let displays = array
-                .fields()
-                .iter()
-                .map(|x| get_display(x.as_ref()))
-                .collect::<Vec<_>>();
             Box::new(move |row: usize| {
                 let (field, index) = array.index(row);
-                displays[field](index)
+                get_display(array.fields()[field].as_ref())(index)
             })
         }
         Extension(_, _, _) => todo!(),