From a3a18202c3465e47675d0df0e303e8f76791e986 Mon Sep 17 00:00:00 2001
From: Wes McKinney <wesm@apache.org>
Date: Mon, 1 Aug 2022 17:41:26 -0500
Subject: [PATCH] Fix compiler warning on gcc 4.x

---
 cpp/src/arrow/compute/kernels/util_internal.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cpp/src/arrow/compute/kernels/util_internal.cc b/cpp/src/arrow/compute/kernels/util_internal.cc
index d3a45c2e17d55..513d88f80b1d3 100644
--- a/cpp/src/arrow/compute/kernels/util_internal.cc
+++ b/cpp/src/arrow/compute/kernels/util_internal.cc
@@ -199,7 +199,7 @@ struct PhysicalTypeVisitor {
 }  // namespace
 
 const DataType* GetPhysicalType(const DataType* real_type) {
-  PhysicalTypeVisitor visitor{real_type, {}};
+  PhysicalTypeVisitor visitor{real_type, nullptr};
   ARROW_CHECK_OK(VisitTypeInline(*real_type, &visitor));
   return visitor.result;
 }