Fix memtracker instantiation when using FETCH_FIRST
Fix memtracker instantiation when using FETCH_FIRST

Change-Id: I47b614b3559880f428951b015291bee4f5af6c49
Reviewed-on: http://gerrit.ent.cloudera.com:8080/3038
Reviewed-by: Henry Robinson <3eca10f30041813f045165784e24b5a950a6cc7e@cloudera.com>
Tested-by: jenkins

tempbottle/Impala,rdblue/Impala,lirui-intel/Impala,caseyching/Impala,bratatidas9/Impala-1,cloudera/recordservice,scalingdata/Impala,ImpalaToGo/ImpalaToGo,bowlofstew/Impala,lnliuxing/Impala,rdblue/Impala,kapilrastogi/Impala,grundprinzip/Impala,scalingdata/Impala,brightchen/Impala,placrosse/ImpalaToGo,cchanning/Impala,rdblue/Impala,placrosse/ImpalaToGo,caseyching/Impala,bratatidas9/Impala-1,bratatidas9/Impala-1,henryr/Impala,brightchen/Impala,kapilrastogi/Impala,cloudera/recordservice,lirui-intel/Impala,caseyching/Impala,cloudera/recordservice,cchanning/Impala,gerashegalov/Impala,kapilrastogi/Impala,ibmsoe/ImpalaPPC,tempbottle/Impala,tempbottle/Impala,tempbottle/Impala,theyaa/Impala,lnliuxing/Impala,grundprinzip/Impala,theyaa/Impala,cchanning/Impala,bowlofstew/Impala,bowlofstew/Impala,ibmsoe/ImpalaPPC,lnliuxing/Impala,caseyching/Impala,lirui-intel/Impala,XiaominZhang/Impala,grundprinzip/Impala,bratatidas9/Impala-1,ImpalaToGo/ImpalaToGo,placrosse/ImpalaToGo,henryr/Impala,bratatidas9/Impala-1,cgvarela/Impala,scalingdata/Impala,lirui-intel/Impala,brightchen/Impala,cchanning/Impala,brightchen/Impala,tempbottle/Impala,cloudera/recordservice,theyaa/Impala,XiaominZhang/Impala,bratatidas9/Impala-1,gerashegalov/Impala,kapilrastogi/Impala,bowlofstew/Impala,kapilrastogi/Impala,lnliuxing/Impala,cgvarela/Impala,brightchen/Impala,rdblue/Impala,cgvarela/Impala,theyaa/Impala,rdblue/Impala,theyaa/Impala,gerashegalov/Impala,cloudera/recordservice,ibmsoe/ImpalaPPC,brightchen/Impala,grundprinzip/Impala,theyaa/Impala,theyaa/Impala,placrosse/ImpalaToGo,brightchen/Impala,ImpalaToGo/ImpalaToGo,caseyching/Impala,gerashegalov/Impala,cloudera/recordservice,lirui-intel/Impala,cchanning/Impala,tempbottle/Impala,henryr/Impala,scalingdata/Impala,bowlofstew/Impala,kapilrastogi/Impala,tempbottle/Impala,bowlofstew/Impala,gerashegalov/Impala,gerashegalov/Impala,grundprinzip/Impala,cgvarela/Impala,scalingdata/Impala,scalingdata/Impala,cgvarela/Impala,XiaominZhang/Impala,lnliuxing/Impala,rdblue/Impala,kapilrastogi/Impala,henryr/Impala,XiaominZhang/Impala,henryr/Impala,XiaominZhang/Impala,XiaominZhang/Impala,ibmsoe/ImpalaPPC,grundprinzip/Impala,cchanning/Impala,placrosse/ImpalaToGo,lirui-intel/Impala,ibmsoe/ImpalaPPC,gerashegalov/Impala,caseyching/Impala,lnliuxing/Impala,lnliuxing/Impala,ImpalaToGo/ImpalaToGo,ibmsoe/ImpalaPPC,placrosse/ImpalaToGo,cgvarela/Impala,cloudera/recordservice,ibmsoe/ImpalaPPC,XiaominZhang/Impala,caseyching/Impala,ImpalaToGo/ImpalaToGo,lirui-intel/Impala,rdblue/Impala,cgvarela/Impala,henryr/Impala,bowlofstew/Impala,ImpalaToGo/ImpalaToGo,cchanning/Impala,bratatidas9/Impala-1