_group update

odbctest/mql/problem/basic/36prepare/21data.mql

@@ -297,6 +297,11 @@ params("3", `{
 **/
 ;
 
+/**
+sleep(2s)
+**/
+;
+
 update /test/mprepare set _group = _group + ? where v_varchar == ?
 /**
 params("aa", "*abc*")