DDL also seems to be working in active mode. Can we can avoid using ExecProcNode ?
DDL also seems to be working in active mode. Can we can avoid using ExecProcNode ?


Former-commit-id: 909aa1b19fcada41edb4a1f2341adef454a2c11e
eric-haibin-lin/peloton-1,malin1993ml/peloton,jessesleeping/iso_peloton,vittvolt/peloton,vittvolt/peloton,ShuxinLin/peloton,AngLi-Leon/peloton,prashasthip/peloton,jessesleeping/iso_peloton,AngLi-Leon/peloton,cmu-db/peloton,vittvolt/15721-peloton,seojungmin/peloton,yingjunwu/peloton,cmu-db/peloton,yingjunwu/peloton,vittvolt/15721-peloton,phisiart/peloton-p3,phisiart/peloton-p3,AngLi-Leon/peloton,AngLi-Leon/peloton,prashasthip/peloton,jessesleeping/iso_peloton,cmu-db/peloton,PauloAmora/peloton,vittvolt/15721-peloton,prashasthip/peloton,prashasthip/peloton,vittvolt/peloton,vittvolt/15721-peloton,eric-haibin-lin/peloton-1,haojin2/peloton,jessesleeping/iso_peloton,apavlo/peloton,ShuxinLin/peloton,AllisonWang/peloton,apavlo/peloton,seojungmin/peloton,vittvolt/15721-peloton,malin1993ml/peloton,yingjunwu/peloton,apavlo/peloton,eric-haibin-lin/peloton-1,AngLi-Leon/peloton,seojungmin/peloton,haojin2/peloton,ShuxinLin/peloton,vittvolt/peloton,wangziqi2016/peloton,cmu-db/peloton,vittvolt/peloton,PauloAmora/peloton,eric-haibin-lin/peloton-1,phisiart/peloton-p3,PauloAmora/peloton,ShuxinLin/peloton,cmu-db/peloton,PauloAmora/peloton,wangziqi2016/peloton,AllisonWang/peloton,apavlo/peloton,yingjunwu/peloton,jessesleeping/iso_peloton,malin1993ml/peloton,haojin2/peloton,haojin2/peloton,wangziqi2016/peloton,malin1993ml/peloton,yingjunwu/peloton,haojin2/peloton,AllisonWang/peloton,prashasthip/peloton,wangziqi2016/peloton,phisiart/peloton-p3,vittvolt/peloton,apavlo/peloton,eric-haibin-lin/peloton-1,seojungmin/peloton,seojungmin/peloton,AngLi-Leon/peloton,malin1993ml/peloton,phisiart/peloton-p3,ShuxinLin/peloton,prashasthip/peloton,yingjunwu/peloton,cmu-db/peloton,PauloAmora/peloton,PauloAmora/peloton,phisiart/peloton-p3,ShuxinLin/peloton,wangziqi2016/peloton,eric-haibin-lin/peloton-1,apavlo/peloton,haojin2/peloton,jessesleeping/iso_peloton,AllisonWang/peloton,AllisonWang/peloton,wangziqi2016/peloton,vittvolt/15721-peloton,seojungmin/peloton,malin1993ml/peloton,AllisonWang/peloton,jessesleeping/iso_peloton