Added Update with expression test in update_test
Added Update with expression test in update_test

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