WL#16345 - Support of JSON SCHEMA functions

1. JSON SCHEMA VALID function
2. JSON SCHEMA VALIDATION REPORT  function

Change-Id: Ia8c15038b13ea60ab71d37600d66cb597fdf33b5

Author: Amith Nagarajappa

sql/item_func.h

@@ -351,7 +351,9 @@ class Item_func : public Item_result_field {
     JSON_STORAGE_SIZE_FUNC,
     JSON_STORAGE_FREE_FUNC,
     JSON_VALUE_FUNC,
-    JSON_SEARCH_FUNC
+    JSON_SEARCH_FUNC,
+    JSON_SCHEMA_VALIDATION_REPORT_FUNC,
+    JSON_SCHEMA_VALID_FUNC
   };
   enum optimize_type {
     OPTIMIZE_NONE,

sql/item_json_func.h

@@ -346,6 +346,7 @@ class Item_func_json_schema_valid final : public Item_bool_func {
   ~Item_func_json_schema_valid() override;
 
   const char *func_name() const override { return "json_schema_valid"; }
+  enum Functype functype() const override { return JSON_SCHEMA_VALID_FUNC; }
 
   bool val_bool() override;
 
@@ -373,6 +374,10 @@ class Item_func_json_schema_validation_report final : public Item_json_func {
     return "json_schema_validation_report";
   }
 
+  enum Functype functype() const override {
+    return JSON_SCHEMA_VALIDATION_REPORT_FUNC;
+  }
+
   bool val_json(Json_wrapper *wr) override;
 
   bool resolve_type(THD *thd) override {