Added a special case in peloton_process_dml for AlterTable
Added a special case in peloton_process_dml for AlterTable


Former-commit-id: b3ec7355dc9ef3596297c749fc63d5916c1a0791
ShuxinLin/peloton,vittvolt/15721-peloton,eric-haibin-lin/peloton-1,yingjunwu/peloton,ShuxinLin/peloton,AngLi-Leon/peloton,PauloAmora/peloton,jessesleeping/iso_peloton,cmu-db/peloton,apavlo/peloton,malin1993ml/peloton,PauloAmora/peloton,jessesleeping/iso_peloton,vittvolt/15721-peloton,vittvolt/15721-peloton,eric-haibin-lin/peloton-1,eric-haibin-lin/peloton-1,malin1993ml/peloton,AllisonWang/peloton,cmu-db/peloton,yingjunwu/peloton,vittvolt/15721-peloton,seojungmin/peloton,AngLi-Leon/peloton,cmu-db/peloton,AngLi-Leon/peloton,phisiart/peloton-p3,phisiart/peloton-p3,malin1993ml/peloton,prashasthip/peloton,apavlo/peloton,wangziqi2016/peloton,PauloAmora/peloton,vittvolt/peloton,vittvolt/15721-peloton,jessesleeping/iso_peloton,jessesleeping/iso_peloton,vittvolt/peloton,vittvolt/peloton,phisiart/peloton-p3,phisiart/peloton-p3,apavlo/peloton,yingjunwu/peloton,AllisonWang/peloton,jessesleeping/iso_peloton,apavlo/peloton,prashasthip/peloton,cmu-db/peloton,seojungmin/peloton,AngLi-Leon/peloton,prashasthip/peloton,AllisonWang/peloton,haojin2/peloton,haojin2/peloton,wangziqi2016/peloton,yingjunwu/peloton,AngLi-Leon/peloton,apavlo/peloton,AllisonWang/peloton,PauloAmora/peloton,AllisonWang/peloton,yingjunwu/peloton,malin1993ml/peloton,prashasthip/peloton,ShuxinLin/peloton,cmu-db/peloton,apavlo/peloton,ShuxinLin/peloton,prashasthip/peloton,haojin2/peloton,ShuxinLin/peloton,yingjunwu/peloton,cmu-db/peloton,haojin2/peloton,phisiart/peloton-p3,haojin2/peloton,wangziqi2016/peloton,eric-haibin-lin/peloton-1,jessesleeping/iso_peloton,eric-haibin-lin/peloton-1,eric-haibin-lin/peloton-1,PauloAmora/peloton,vittvolt/15721-peloton,vittvolt/peloton,vittvolt/peloton,AngLi-Leon/peloton,phisiart/peloton-p3,wangziqi2016/peloton,malin1993ml/peloton,seojungmin/peloton,PauloAmora/peloton,AllisonWang/peloton,wangziqi2016/peloton,seojungmin/peloton,haojin2/peloton,ShuxinLin/peloton,prashasthip/peloton,seojungmin/peloton,vittvolt/peloton,malin1993ml/peloton,wangziqi2016/peloton,seojungmin/peloton,jessesleeping/iso_peloton