From d2ed61c30f984eec83a9cd02f1a7f89dab3f7645 Mon Sep 17 00:00:00 2001
From: Junming Chen <junming.chen.r@outlook.com>
Date: Thu, 19 Oct 2023 08:54:57 +0800
Subject: [PATCH] Update
 cpp/src/arrow/compute/kernels/aggregate_basic_internal.h

Co-authored-by: Antoine Pitrou <pitrou@free.fr>
---
 cpp/src/arrow/compute/kernels/aggregate_basic_internal.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/cpp/src/arrow/compute/kernels/aggregate_basic_internal.h b/cpp/src/arrow/compute/kernels/aggregate_basic_internal.h
index 4268b44e98805..2285fad5877b7 100644
--- a/cpp/src/arrow/compute/kernels/aggregate_basic_internal.h
+++ b/cpp/src/arrow/compute/kernels/aggregate_basic_internal.h
@@ -921,8 +921,8 @@ struct DictionaryMinMaxImpl : public ScalarAggregator {
         out_type(std::move(out_type)),
         has_nulls(false),
         count(0),
-        min(nullptr),
-        max(nullptr) {
+        min(MakeNullScalar(this->out_type)),
+        max(this->min) {
     this->options.min_count = std::max<uint32_t>(1, this->options.min_count);
   }