From 4a1a375920ecd3f98e73e6befb98cb6bccfa466e Mon Sep 17 00:00:00 2001
From: HuSen8891 <husen.xjtu@gmail.com>
Date: Thu, 22 Aug 2024 00:28:44 +0800
Subject: [PATCH] Add test to verify count aggregate function should not be
 nullable

---
 datafusion/sqllogictest/test_files/aggregate.slt | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/datafusion/sqllogictest/test_files/aggregate.slt b/datafusion/sqllogictest/test_files/aggregate.slt
index b8b93b28aff6..d39bf6538ecb 100644
--- a/datafusion/sqllogictest/test_files/aggregate.slt
+++ b/datafusion/sqllogictest/test_files/aggregate.slt
@@ -5387,6 +5387,18 @@ physical_plan
 statement ok
 DROP TABLE empty;
 
+# verify count aggregate function should not be nullable
+statement ok
+create table empty;
+
+query I
+select distinct count() from empty;
+----
+0
+
+statement ok
+DROP TABLE empty;
+
 statement ok
 CREATE TABLE t(col0 INTEGER) as VALUES(2);