fixed bugs in the fib plpgsql function
fixed bugs in the fib plpgsql function

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