From b03f2baf674c34fd779c2182cdb8c702b00e6ab1 Mon Sep 17 00:00:00 2001
From: Raphael Taylor-Davies <r.taylordavies@googlemail.com>
Date: Thu, 22 Apr 2021 09:08:16 +0100
Subject: [PATCH] ARROW-12504: Buffer::from_slice_ref set correct capacity

---
 arrow/src/buffer/immutable.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arrow/src/buffer/immutable.rs b/arrow/src/buffer/immutable.rs
index cd6a2a3c1305..7c8234dd0403 100644
--- a/arrow/src/buffer/immutable.rs
+++ b/arrow/src/buffer/immutable.rs
@@ -55,8 +55,8 @@ impl Buffer {
     /// Initializes a [Buffer] from a slice of items.
     pub fn from_slice_ref<U: ArrowNativeType, T: AsRef<[U]>>(items: &T) -> Self {
         let slice = items.as_ref();
-        let len = slice.len();
-        let mut buffer = MutableBuffer::with_capacity(len);
+        let capacity = slice.len() * std::mem::size_of::<T>();
+        let mut buffer = MutableBuffer::with_capacity(capacity);
         buffer.extend_from_slice(slice);
         buffer.into()
     }