MDEV-23437 Item_func_json_objectagg::print is not implemented.

Fix the Item_func_json_objectagg::fix_fields to save the orig_args.

mysql-test/main/func_json.result

@@ -1354,6 +1354,11 @@ e	JSON_OBJECTAGG(B.a, B.v)
 0	{"a1":"1", "a1":"1", "a1":"1"}
 0	{"a2":"2", "a2":"2", "a2":"2"}
 1	{"b1":"3", "b1":"3", "b1":"3"}
+CREATE VIEW v AS SELECT JSON_OBJECTAGG(a, e) FROM t1;
+SELECT * FROM v;
+JSON_OBJECTAGG(a, e)
+{"a1":0, "a2":0, "b1":1}
+DROP VIEW v;
 DROP TABLE t1;
 #
 # End of 10.5 tests

mysql-test/main/func_json.test

@@ -849,6 +849,10 @@ INSERT INTO t1 VALUES (0, 'a1', '1') , (0, 'a2', '2') , (1, 'b1', '3');
 EXPLAIN SELECT B.e, JSON_OBJECTAGG(B.a, B.v) FROM t1 A, t1 B GROUP BY B.e, B.a;
 SELECT B.e, JSON_OBJECTAGG(B.a, B.v) FROM t1 A, t1 B GROUP BY B.e, B.a;
 
+CREATE VIEW v AS SELECT JSON_OBJECTAGG(a, e) FROM t1;
+SELECT * FROM v;
+
+DROP VIEW v;
 DROP TABLE t1;
 
 --echo #

sql/item_jsonfunc.cc

@@ -3772,6 +3772,8 @@ Item_func_json_objectagg::fix_fields(THD *thd, Item **ref)
   uint i;                       /* for loop variable */
   DBUG_ASSERT(fixed == 0);
 
+  memcpy(orig_args, args, sizeof(Item*) * arg_count);
+
   if (init_sum_func_check(thd))
     return TRUE;
 
@@ -3867,7 +3869,3 @@ String* Item_func_json_objectagg::val_str(String* str)
 }
 
 
-void Item_func_json_objectagg::print(String *str, enum_query_type query_type)
-{
-}
-

sql/item_jsonfunc.h

@@ -589,7 +589,7 @@ class Item_func_json_objectagg : public Item_sum
   void cleanup();
 
   enum Sumfunctype sum_func () const {return JSON_OBJECTAGG_FUNC;}
-  const char *func_name() const { return "json_objectagg("; }
+  const char *func_name() const { return "json_objectagg"; }
   const Type_handler *type_handler() const
   {
     if (too_big_for_varchar())
@@ -618,7 +618,6 @@ class Item_func_json_objectagg : public Item_sum
   String* val_str(String* str);
   Item *copy_or_same(THD* thd);
   void no_rows_in_result() {}
-  void print(String *str, enum_query_type query_type);
   Item *get_copy(THD *thd)
   { return get_item_copy<Item_func_json_objectagg>(thd, this); }
 };