From 68f80610ea127c2ee28a1aa83130727bcbeba9fb Mon Sep 17 00:00:00 2001
From: Carlos O'Ryan <coryan@google.com>
Date: Tue, 2 Nov 2021 19:48:12 +0000
Subject: [PATCH] ARROW-14559: [C++] reduce memory usage in
 GcsFileSystem::OpenInputStream

---
 cpp/src/arrow/filesystem/gcsfs.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/cpp/src/arrow/filesystem/gcsfs.cc b/cpp/src/arrow/filesystem/gcsfs.cc
index beb6c0a89ef..73d599fffa5 100644
--- a/cpp/src/arrow/filesystem/gcsfs.cc
+++ b/cpp/src/arrow/filesystem/gcsfs.cc
@@ -95,7 +95,8 @@ class GcsInputStream : public arrow::io::InputStream {
     if (!stream_.status().ok()) {
       return internal::ToArrowStatus(stream_.status());
     }
-    return arrow::SliceMutableBufferSafe(std::move(buffer), 0, stream_.gcount());
+    RETURN_NOT_OK(buffer->Resize(stream_.gcount(), true));
+    return buffer;
   }
 
  private: