From d0c80c211c1fe3370b68be540bb9113028c6746f Mon Sep 17 00:00:00 2001
From: Dave Gosselin <dave.gosselin@mariadb.com>
Date: Mon, 8 Jan 2024 11:58:29 -0500
Subject: [PATCH] MDEV-32090 Test for null-safe equals in join

This ticket is fixed by MDEV-32555 and this test captures a different use case.
---
 mysql-test/main/subselect_nulls_innodb.result | 27 ++++++++++++++++
 mysql-test/main/subselect_nulls_innodb.test   | 32 +++++++++++++++++++
 2 files changed, 59 insertions(+)
 create mode 100644 mysql-test/main/subselect_nulls_innodb.result
 create mode 100644 mysql-test/main/subselect_nulls_innodb.test

diff --git a/mysql-test/main/subselect_nulls_innodb.result b/mysql-test/main/subselect_nulls_innodb.result
new file mode 100644
index 00000000000..2cab41760b3
--- /dev/null
+++ b/mysql-test/main/subselect_nulls_innodb.result
@@ -0,0 +1,27 @@
+#
+# MDEV-32090 Index does not handle null-safe equals operator correctly in join
+#
+CREATE TEMPORARY TABLE t1 (
+`id` int(10) unsigned NOT NULL,
+`number` int(10) unsigned DEFAULT 0,
+`name` varchar(47) DEFAULT NULL,
+`street` mediumint(8) unsigned DEFAULT NULL,
+PRIMARY KEY (`id`),
+KEY `streetNumber` (`street`,`number`,`name`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3 COLLATE=utf8mb3_unicode_ci;
+INSERT INTO t1 (id, number, name, street) VALUES (100733476, 14, NULL, 1115569);
+SELECT
+b1.id
+FROM
+t1 b1
+INNER JOIN t1 b2 ON (
+b1.street = b2.street
+AND b1.number <=> b2.number
+AND b1.name <=> b2.name
+);
+id
+100733476
+DROP TABLE t1;
+#
+# End of 10.11 tests
+#
diff --git a/mysql-test/main/subselect_nulls_innodb.test b/mysql-test/main/subselect_nulls_innodb.test
new file mode 100644
index 00000000000..79d572a2e0e
--- /dev/null
+++ b/mysql-test/main/subselect_nulls_innodb.test
@@ -0,0 +1,32 @@
+--source include/have_innodb.inc
+
+--echo #
+--echo # MDEV-32090 Index does not handle null-safe equals operator correctly in join
+--echo #
+
+CREATE TEMPORARY TABLE t1 (
+  `id` int(10) unsigned NOT NULL,
+  `number` int(10) unsigned DEFAULT 0,
+  `name` varchar(47) DEFAULT NULL,
+  `street` mediumint(8) unsigned DEFAULT NULL,
+  PRIMARY KEY (`id`),
+  KEY `streetNumber` (`street`,`number`,`name`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3 COLLATE=utf8mb3_unicode_ci;
+
+INSERT INTO t1 (id, number, name, street) VALUES (100733476, 14, NULL, 1115569);
+
+SELECT
+    b1.id
+FROM
+    t1 b1
+    INNER JOIN t1 b2 ON (
+        b1.street = b2.street
+        AND b1.number <=> b2.number
+        AND b1.name <=> b2.name
+    );
+
+DROP TABLE t1;
+
+--echo #
+--echo # End of 10.11 tests
+--echo #