MDEV-15319: [SQL Layer] Server crashes in Field::set_null / myrocks::ha_rocksdb ...

Added a testcase

storage/rocksdb/mysql-test/rocksdb/r/mariadb_port_fixes.result

@@ -107,3 +107,12 @@ a	b
 101	foo
 102	bar
 DROP TABLE t1;
+#
+# MDEV-15319: [SQL Layer] Server crashes in Field::set_null / myrocks::ha_rocksdb::convert_record_from_storage_format
+#  (just a testcase)
+#
+CREATE TABLE t1 (i INT);
+INSERT INTO t1 VALUES (1);
+CREATE TABLE t2 ENGINE=RocksDB AS SELECT VALUES(i) AS a FROM t1;
+DELETE FROM t2;
+DROP TABLE t1,t2;

storage/rocksdb/mysql-test/rocksdb/t/mariadb_port_fixes.test

@@ -101,3 +101,14 @@ UPDATE t1 SET a=a+100;
 SELECT * FROM t1;
 DROP TABLE t1;
 
+
+--echo #
+--echo # MDEV-15319: [SQL Layer] Server crashes in Field::set_null / myrocks::ha_rocksdb::convert_record_from_storage_format
+--echo #  (just a testcase)
+--echo #
+
+CREATE TABLE t1 (i INT);
+INSERT INTO t1 VALUES (1);
+CREATE TABLE t2 ENGINE=RocksDB AS SELECT VALUES(i) AS a FROM t1;
+DELETE FROM t2;
+DROP TABLE t1,t2;