MDEV-12324 Wrong result (phantom array value) on JSON_EXTRACT.

Fixed the path comparison.

mysql-test/r/func_json.result

@@ -642,3 +642,9 @@ SELECT JSON_KEYS(f) FROM t1 ORDER BY 1;
 JSON_KEYS(f)
 NULL
 DROP TABLE t1;
+SELECT JSON_EXTRACT( '{"foo":"bar"}', '$[*].*' );
+JSON_EXTRACT( '{"foo":"bar"}', '$[*].*' )
+NULL
+SELECT JSON_EXTRACT( '{"foo":"bar"}', '$[*]' );
+JSON_EXTRACT( '{"foo":"bar"}', '$[*]' )
+NULL

mysql-test/t/func_json.test

@@ -296,3 +296,9 @@ INSERT INTO t1 VALUES (0);
 SELECT JSON_KEYS(f) FROM t1 ORDER BY 1;
 DROP TABLE t1;
 
+#
+# MDEV-12324 Wrong result (phantom array value) on JSON_EXTRACT.
+#
+SELECT JSON_EXTRACT( '{"foo":"bar"}', '$[*].*' );
+SELECT JSON_EXTRACT( '{"foo":"bar"}', '$[*]' );
+

strings/json_lib.c

@@ -1756,7 +1756,7 @@ int json_path_parts_compare(
           goto step_fits;
         goto step_failed;
       }
-      if (a->n_item == 0)
+      if ((a->type & JSON_PATH_WILD) == 0 && a->n_item == 0)
         goto step_fits_autowrap;
       goto step_failed;
     }