From 24004ace7de9a7575a9f4a8875eec56ea4b49505 Mon Sep 17 00:00:00 2001
From: Ran Tao <chucheng.tr@gmail.com>
Date: Thu, 19 Oct 2023 16:27:07 +0800
Subject: [PATCH] Add test

---
 core/src/test/resources/sql/sub-query.iq | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/core/src/test/resources/sql/sub-query.iq b/core/src/test/resources/sql/sub-query.iq
index aa43c54d923f..8566223f2164 100644
--- a/core/src/test/resources/sql/sub-query.iq
+++ b/core/src/test/resources/sql/sub-query.iq
@@ -3696,4 +3696,16 @@ SELECT map(SELECT empno, deptno from emp where deptno < 20);
 
 !ok
 
+# [CALCITE-6041] MAP sub-query gives NullPointerException
+# empty map
+SELECT map(SELECT empno, deptno from emp where false);
++--------+
+| EXPR$0 |
++--------+
+| {}     |
++--------+
+(1 row)
+
+!ok
+
 # End sub-query.iq