Fix the unfreed InsertStatement in inserts_test.
Fix the unfreed InsertStatement in inserts_test.

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