MDEV-11442 Server crashes in String::length / parse_one_or_all...

MDEV-11442 Server crashes in String::length / parse_one_or_all /Item_func_json_contains_path::val_int

        Didn't expect 'one_or_all' parameter to be NULL.

mysql-test/r/func_json.result

@@ -88,6 +88,9 @@ json_contains_path('{"key1":1, "key2":[2,3]}', "aLl", "$.key1", "$.ma")
 select json_contains_path('{"key1":1, "key2":[2,3]}', "aLl", "$.key1", "$.key2");
 json_contains_path('{"key1":1, "key2":[2,3]}', "aLl", "$.key1", "$.key2")
 1
+select json_contains_path('{ "a": true }', NULL, '$.a' );
+json_contains_path('{ "a": true }', NULL, '$.a' )
+NULL
 select json_extract('{"key1":"asd", "key2":[2,3]}', "$.key1");
 json_extract('{"key1":"asd", "key2":[2,3]}', "$.key1")
 "asd"

mysql-test/t/func_json.test

@@ -35,6 +35,7 @@ select json_contains_path('{"key1":1, "key2":[2,3]}', "one", "$.key1");
 select json_contains_path('{"key1":1, "key2":[2,3]}', "one", "$.key1", "$.ma");
 select json_contains_path('{"key1":1, "key2":[2,3]}', "aLl", "$.key1", "$.ma");
 select json_contains_path('{"key1":1, "key2":[2,3]}', "aLl", "$.key1", "$.key2");
+select json_contains_path('{ "a": true }', NULL, '$.a' );
  
 select json_extract('{"key1":"asd", "key2":[2,3]}', "$.key1");
 select json_extract('{"key1":"asd", "key2":[2,3]}', "$.keyX", "$.keyY");

sql/item_jsonfunc.cc

@@ -725,7 +725,8 @@ static int parse_one_or_all(Item *ooa_arg,
   {
     char buff[20];
     String *res, tmp(buff, sizeof(buff), &my_charset_bin);
-    res= ooa_arg->val_str(&tmp);
+    if ((res= ooa_arg->val_str(&tmp)) == NULL)
+      return TRUE;
     *mode_one=eq_ascii_string(res->charset(), "one",
                              res->ptr(), res->length());
     if (!*mode_one)