Added hash join executor template
Added hash join executor template


Former-commit-id: 16beba5645f99f6371a725f6ffeec105bc495f47
jessesleeping/iso_peloton,apavlo/peloton,eric-haibin-lin/peloton-1,phisiart/peloton-p3,apavlo/peloton,malin1993ml/peloton,wangziqi2016/peloton,prashasthip/peloton,haojin2/peloton,AngLi-Leon/peloton,PauloAmora/peloton,AngLi-Leon/peloton,apavlo/peloton,eric-haibin-lin/peloton-1,eric-haibin-lin/peloton-1,PauloAmora/peloton,cmu-db/peloton,haojin2/peloton,vittvolt/peloton,vittvolt/15721-peloton,PauloAmora/peloton,prashasthip/peloton,jessesleeping/iso_peloton,haojin2/peloton,ShuxinLin/peloton,apavlo/peloton,vittvolt/15721-peloton,seojungmin/peloton,vittvolt/peloton,ShuxinLin/peloton,vittvolt/15721-peloton,AngLi-Leon/peloton,seojungmin/peloton,AngLi-Leon/peloton,wangziqi2016/peloton,yingjunwu/peloton,seojungmin/peloton,jessesleeping/iso_peloton,haojin2/peloton,AllisonWang/peloton,cmu-db/peloton,jessesleeping/iso_peloton,phisiart/peloton-p3,ShuxinLin/peloton,AngLi-Leon/peloton,AllisonWang/peloton,AllisonWang/peloton,jessesleeping/iso_peloton,phisiart/peloton-p3,vittvolt/peloton,wangziqi2016/peloton,vittvolt/peloton,cmu-db/peloton,prashasthip/peloton,prashasthip/peloton,malin1993ml/peloton,seojungmin/peloton,wangziqi2016/peloton,ShuxinLin/peloton,PauloAmora/peloton,phisiart/peloton-p3,jessesleeping/iso_peloton,malin1993ml/peloton,seojungmin/peloton,phisiart/peloton-p3,haojin2/peloton,malin1993ml/peloton,vittvolt/15721-peloton,wangziqi2016/peloton,phisiart/peloton-p3,eric-haibin-lin/peloton-1,seojungmin/peloton,yingjunwu/peloton,wangziqi2016/peloton,apavlo/peloton,cmu-db/peloton,AngLi-Leon/peloton,PauloAmora/peloton,ShuxinLin/peloton,yingjunwu/peloton,malin1993ml/peloton,yingjunwu/peloton,vittvolt/peloton,apavlo/peloton,yingjunwu/peloton,yingjunwu/peloton,ShuxinLin/peloton,malin1993ml/peloton,vittvolt/15721-peloton,eric-haibin-lin/peloton-1,cmu-db/peloton,AllisonWang/peloton,prashasthip/peloton,jessesleeping/iso_peloton,prashasthip/peloton,AllisonWang/peloton,AllisonWang/peloton,haojin2/peloton,vittvolt/15721-peloton,PauloAmora/peloton,eric-haibin-lin/peloton-1,vittvolt/peloton,cmu-db/peloton