Fix decimal test. Overflow was not initialized.
Fix decimal test. Overflow was not initialized.

Change-Id: Ib4e3a3ae12c39a15ba85a231a2d5d81d1fd0ff4e
Reviewed-on: http://gerrit.ent.cloudera.com:8080/2907
Reviewed-by: Nong Li <99a5e5f8f5911755b88e0b536d46aafa102bed41@cloudera.com>
Tested-by: jenkins

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