WL#3700: Handler API change: all index search methods - that is,

index_read(), index_read_idx(), index_read_last(), and
records_in_range() - instead of 'uint keylen' argument take
'ulonglong keypart_map', a bitmap showing which keyparts are
present in the key value.
Fallback method is provided for handlers that are lagging behind.

sql/sql_plugin.cc

@@ -921,8 +921,7 @@ my_bool mysql_uninstall_plugin(THD *thd, const LEX_STRING *name)
   table->use_all_columns();
   table->field[0]->store(name->str, name->length, system_charset_info);
   if (! table->file->index_read_idx(table->record[0], 0,
-                                    (byte *)table->field[0]->ptr,
-                                    table->key_info[0].key_length,
+                                    (byte *)table->field[0]->ptr, ~ULL(0),
                                     HA_READ_KEY_EXACT))
   {
     int error;