MDEV-14613: Assertion `fixed == 0' failed in Item_func::fix_fields

fix_fields calls fixed.

mysql-test/r/func_misc.result

@@ -1523,5 +1523,20 @@ str	str1	b	c
 ::10.0.5.9	::10.0.5.9	1	0
 DROP TABLE t1;
 #
+# MDEV-14613: Assertion `fixed == 0' failed in Item_func::fix_fields
+#
+CREATE TABLE `t1` (
+`numgtfmt` char(10) COLLATE utf8_bin NOT NULL 
+) DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
+create view v1(numgtfmt)
+as
+select 'x' from t1
+union
+select 'x' from t1 ;
+SELECT * FROM v1 WHERE numgtfmt =  NAME_CONST('wnumgtfmt',_utf8'QEDITIONS' COLLATE 'utf8_bin');
+numgtfmt
+DROP VIEW v1;
+DROP TABLE t1;
+#
 # End of 10.2 tests
 #

mysql-test/t/func_misc.test

@@ -1152,6 +1152,27 @@ INSERT INTO t1 (str) VALUES ('::FFFF:192.168.0.1'),('::10.0.5.9');
 SELECT str, str1, b,c FROM t1;
 DROP TABLE t1;
 
+--echo #
+--echo # MDEV-14613: Assertion `fixed == 0' failed in Item_func::fix_fields
+--echo #
+
+CREATE TABLE `t1` (
+  `numgtfmt` char(10) COLLATE utf8_bin NOT NULL 
+) DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
+ 
+create view v1(numgtfmt)
+as
+select 'x' from t1
+union
+select 'x' from t1 ;
+ 
+SELECT * FROM v1 WHERE numgtfmt =  NAME_CONST('wnumgtfmt',_utf8'QEDITIONS' COLLATE 'utf8_bin');
+ 
+# Cleanup
+DROP VIEW v1;
+DROP TABLE t1;
+
+
 --echo #
 --echo # End of 10.2 tests
 --echo #

sql/item.cc

@@ -1814,8 +1814,10 @@ bool Item_name_const::fix_fields(THD *thd, Item **ref)
   String s(buf, sizeof(buf), &my_charset_bin);
   s.length(0);
 
-  if (value_item->fix_fields(thd, &value_item) ||
-      name_item->fix_fields(thd, &name_item) ||
+  if ((!value_item->fixed &&
+       value_item->fix_fields(thd, &value_item)) ||
+      (!name_item->fixed &&
+       name_item->fix_fields(thd, &name_item)) ||
       !value_item->const_item() ||
       !name_item->const_item() ||
       !(item_name= name_item->val_str(&s))) // Can't have a NULL name