data0type.ic, rem0cmp.c:

  Allow foreign keys refer between fixed and var length strings

innobase/include/data0type.ic

@@ -107,14 +107,17 @@ dtype_get_pad_char(
 				ULINT_UNDEFINED if no padding specified */
 	dtype_t*	type)	/* in: type */
 {
-	if (type->mtype == DATA_CHAR) {
-		/* space is the padding character for all char strings */
+	if (type->mtype == DATA_CHAR
+	    || type->mtype == DATA_VARCHAR
+	    || type->mtype == DATA_BINARY
+	    || type->mtype == DATA_FIXBINARY) {
+
+		/* Space is the padding character for all char and binary
+	        strings */
 
 		return((ulint)' ');
 	}
 
-	ut_ad((type->mtype == DATA_BINARY) || (type->mtype == DATA_VARCHAR));
-
 	/* No padding specified */
 
 	return(ULINT_UNDEFINED);

innobase/rem/rem0cmp.c

@@ -100,7 +100,15 @@ cmp_types_are_equal(
 	dtype_t*	type1,	/* in: type 1 */
 	dtype_t*	type2)	/* in: type 2 */
 {
-	if (type1->mtype != type2->mtype) {
+        if ((type1->mtype == DATA_VARCHAR && type2->mtype == DATA_CHAR)
+          || (type1->mtype == DATA_CHAR && type2->mtype == DATA_VARCHAR)
+          || (type1->mtype == DATA_FIXBINARY && type2->mtype == DATA_BINARY)
+          || (type1->mtype == DATA_BINARY && type2->mtype == DATA_FIXBINARY)) {
+
+                return(TRUE);
+        }
+
+        if (type1->mtype != type2->mtype) {
 
 		return(FALSE);
 	}