diff --git a/mysql-test/main/derived_split_innodb.result b/mysql-test/main/derived_split_innodb.result
index 327f3c247c1..fc8f6551d49 100644
--- a/mysql-test/main/derived_split_innodb.result
+++ b/mysql-test/main/derived_split_innodb.result
@@ -963,4 +963,39 @@ cnt
 6
 DROP TABLE t1;
 # End of 10.4 tests
+#
+# MDEV-37057 Wrong result with LATERAL DERIVED
+#
+CREATE TABLE t1 (
+a int NOT NULL,
+b int default null,
+amount decimal DEFAULT NULL,
+KEY t1_IDX (a,b) USING BTREE
+) ENGINE=INNODB;
+CREATE TABLE t2 (
+a int NOT NULL,
+b int default null,
+name varchar(50) DEFAULT NULL,
+KEY t2_IDX (a,b) USING BTREE
+) ENGINE=INNODB;
+INSERT INTO t1 VALUES
+(1, NULL, 10.0000), (2, 2, 20.0000), (3, 3, 30.0000), (4, 4, 40.0000),
+(5, 5, NULL), (6, 6, NULL), (7, 7, 70.0000), (8, 8, 80.0000);
+INSERT INTO t2 VALUES
+(1, NULL, 'A'), (2,2, 'B'), (3,3, 'C'), (4,4, 'D'), (5,5, NULL), (6,6, NULL),
+(7,7, 'E'), (8,8, 'F'), (9,9, 'G'), (10,10,'H'), (11,11, NULL), (12,12, NULL);
+# Must use Split-Materialized:
+explain $query;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t2	range	t2_IDX	t2_IDX	4	NULL	1	Using index condition
+1	PRIMARY	<derived2>	ref	key0	key0	10	test.t2.a,test.t2.b	1	Using where
+2	LATERAL DERIVED	t1	ref	t1_IDX	t1_IDX	9	test.t2.a,test.t2.b	1	
+$query;
+a	b	name	total_amt
+1	NULL	A	10
+# Compare with correct result:
+set statement optimizer_switch='split_materialized=off' for $query;
+a	b	name	total_amt
+1	NULL	A	10
+DROP TABLE t1,t2;
 SET GLOBAL innodb_stats_persistent=@save_innodb_stats_persistent;
diff --git a/mysql-test/main/derived_split_innodb.test b/mysql-test/main/derived_split_innodb.test
index f0498834254..b5a985a0453 100644
--- a/mysql-test/main/derived_split_innodb.test
+++ b/mysql-test/main/derived_split_innodb.test
@@ -561,4 +561,47 @@ DROP TABLE t1;
 
 --echo # End of 10.4 tests
 
+--echo #
+--echo # MDEV-37057 Wrong result with LATERAL DERIVED
+--echo #
+
+CREATE TABLE t1 (
+  a int NOT NULL,
+  b int default null,
+  amount decimal DEFAULT NULL,
+  KEY t1_IDX (a,b) USING BTREE
+) ENGINE=INNODB;
+
+CREATE TABLE t2 (
+  a int NOT NULL,
+  b int default null,
+  name varchar(50) DEFAULT NULL,
+  KEY t2_IDX (a,b) USING BTREE
+) ENGINE=INNODB;
+
+INSERT INTO t1 VALUES
+(1, NULL, 10.0000), (2, 2, 20.0000), (3, 3, 30.0000), (4, 4, 40.0000),
+(5, 5, NULL), (6, 6, NULL), (7, 7, 70.0000), (8, 8, 80.0000);
+
+INSERT INTO t2 VALUES
+(1, NULL, 'A'), (2,2, 'B'), (3,3, 'C'), (4,4, 'D'), (5,5, NULL), (6,6, NULL),
+(7,7, 'E'), (8,8, 'F'), (9,9, 'G'), (10,10,'H'), (11,11, NULL), (12,12, NULL);
+
+let $query=
+SELECT t2.a,t2.b,t2.name,t.total_amt FROM t2
+LEFT JOIN
+(
+  SELECT a, b, sum(amount) total_amt FROM t1 GROUP BY a, b
+) AS t ON t2.a=t.a and t2.b<=>t.b
+WHERE t2.a < 2;
+
+--echo # Must use Split-Materialized:
+evalp explain $query;
+evalp $query;
+--echo # Compare with correct result:
+evalp set statement optimizer_switch='split_materialized=off' for $query;
+
+DROP TABLE t1,t2;
+
+# End of 11.4 tests;
 SET GLOBAL innodb_stats_persistent=@save_innodb_stats_persistent;
diff --git a/sql/opt_split.cc b/sql/opt_split.cc
index 627572ac17a..1fc69b65714 100644
--- a/sql/opt_split.cc
+++ b/sql/opt_split.cc
@@ -626,14 +626,7 @@ void TABLE::add_splitting_info_for_key_field(KEY_FIELD *key_field)
   added_key_field->level= 0;
   added_key_field->optimize= KEY_OPTIMIZE_EQ;
   added_key_field->eq_func= true;
-
-  Item *real= key_field->val->real_item();
-  if ((real->type() == Item::FIELD_ITEM) &&
-        ((Item_field*)real)->field->maybe_null())
-    added_key_field->null_rejecting= true;
-  else
-    added_key_field->null_rejecting= false;
-
+  added_key_field->null_rejecting= key_field->null_rejecting;
   added_key_field->cond_guard= NULL;
   added_key_field->sj_pred_no= UINT_MAX;
   return;