Bug#31210 - INSERT DELAYED crashes server when used on

                partitioned table
    
Post-pushbuild fix
    
Pushbuild detected yet another need for lex initialization in
embedded server.


libmysqld/lib_sql.cc:
  Bug#31210 - INSERT DELAYED crashes server when used on
                      partitioned table
  Initialized lex for later use in open_table().

libmysqld/lib_sql.cc

@@ -587,6 +587,7 @@ void *create_embedded_thd(int client_flag)
     fprintf(stderr,"store_globals failed.\n");
     goto err;
   }
+  lex_start(thd);
 
   /* TODO - add init_connect command execution */