add merge join test scripts
add merge join test scripts

amaliujia/peloton,amaliujia/peloton,Ghatage/peloton,Ghatage/peloton,amaliujia/peloton,amaliujia/peloton,amaliujia/peloton,Ghatage/peloton,Ghatage/peloton,Ghatage/peloton,Ghatage/peloton,Ghatage/peloton,amaliujia/peloton,amaliujia/peloton