add merge join test scripts
add merge join test scripts


Former-commit-id: b6e049aec84134284404d3309c96650ca03651ea
larryxiao/peloton-1,amaliujia/CMUDB-peloton,amaliujia/CMUDB-peloton,ranxian/peloton,omegaga/peloton,omegaga/peloton,larryxiao/peloton-1,larryxiao/peloton,omegaga/peloton,omegaga/peloton,larryxiao/peloton-1,larryxiao/peloton,amaliujia/CMUDB-peloton,amaliujia/CMUDB-peloton,larryxiao/peloton-1,larryxiao/peloton,ranxian/peloton,omegaga/peloton,larryxiao/peloton,ranxian/peloton,amaliujia/CMUDB-peloton,amaliujia/CMUDB-peloton,larryxiao/peloton,ranxian/peloton,larryxiao/peloton-1,amaliujia/CMUDB-peloton,larryxiao/peloton-1,omegaga/peloton,omegaga/peloton,ranxian/peloton,ranxian/peloton,larryxiao/peloton,larryxiao/peloton,larryxiao/peloton-1