MDEV-19216 Assertion ...SYS_FOREIGN failed in btr_node_ptr_max_size

btr_node_ptr_max_size(): Handle BINARY(0) and VARBINARY(0)
as special cases, similar to CHAR(0) and VARCHAR(0).

mysql-test/suite/innodb/r/data_types.result

@@ -174,3 +174,10 @@ DROP TABLE t1;
 CREATE TABLE t1 (c VARCHAR(0), KEY(c)) ENGINE=InnoDB;
 INSERT INTO t1 VALUES ('');
 DROP TABLE t1;
+#
+# MDEV-19216 Assertion ...SYS_FOREIGN failed in btr_node_ptr_max_size
+#
+CREATE TABLE t1 (b BINARY(0), v VARBINARY(0), KEY(b), KEY(v)) ENGINE=InnoDB;
+INSERT INTO t1 SET b='',v='';
+DROP TABLE t1;
+# End of 10.4 tests

mysql-test/suite/innodb/t/data_types.test

@@ -136,3 +136,13 @@ DROP TABLE t1;
 CREATE TABLE t1 (c VARCHAR(0), KEY(c)) ENGINE=InnoDB;
 INSERT INTO t1 VALUES ('');
 DROP TABLE t1;
+
+--echo #
+--echo # MDEV-19216 Assertion ...SYS_FOREIGN failed in btr_node_ptr_max_size
+--echo #
+
+CREATE TABLE t1 (b BINARY(0), v VARBINARY(0), KEY(b), KEY(v)) ENGINE=InnoDB;
+INSERT INTO t1 SET b='',v='';
+DROP TABLE t1;
+
+--echo # End of 10.4 tests

storage/innobase/btr/btr0cur.cc

@@ -1148,10 +1148,13 @@ static ulint btr_node_ptr_max_size(const dict_index_t* index)
 					break;
 				}
 				/* fall through */
+			case DATA_FIXBINARY:
+			case DATA_BINARY:
 			case DATA_VARMYSQL:
 			case DATA_CHAR:
 			case DATA_MYSQL:
-				/* CHAR(0) and VARCHAR(0) are possible
+				/* BINARY(0), VARBINARY(0),
+				CHAR(0) and VARCHAR(0) are possible
 				data type definitions in MariaDB.
 				The InnoDB internal SQL parser maps
 				CHAR to DATA_VARCHAR, so DATA_CHAR (or