Add a test case for GroupBy and complex Aggregation
Add a test case for GroupBy and complex Aggregation

malin1993ml/peloton,AngLi-Leon/peloton,vittvolt/peloton,malin1993ml/peloton,apavlo/peloton,cmu-db/peloton,haojin2/peloton,prashasthip/peloton,haojin2/peloton,vittvolt/peloton,apavlo/peloton,cmu-db/peloton,haojin2/peloton,apavlo/peloton,AllisonWang/peloton,AllisonWang/peloton,seojungmin/peloton,seojungmin/peloton,AngLi-Leon/peloton,AllisonWang/peloton,yingjunwu/peloton,malin1993ml/peloton,seojungmin/peloton,AngLi-Leon/peloton,yingjunwu/peloton,AllisonWang/peloton,cmu-db/peloton,yingjunwu/peloton,cmu-db/peloton,cmu-db/peloton,AngLi-Leon/peloton,PauloAmora/peloton,haojin2/peloton,malin1993ml/peloton,yingjunwu/peloton,yingjunwu/peloton,malin1993ml/peloton,AngLi-Leon/peloton,prashasthip/peloton,vittvolt/peloton,haojin2/peloton,PauloAmora/peloton,apavlo/peloton,haojin2/peloton,PauloAmora/peloton,vittvolt/peloton,AllisonWang/peloton,prashasthip/peloton,seojungmin/peloton,AngLi-Leon/peloton,seojungmin/peloton,vittvolt/peloton,seojungmin/peloton,cmu-db/peloton,yingjunwu/peloton,vittvolt/peloton,PauloAmora/peloton,prashasthip/peloton,apavlo/peloton,malin1993ml/peloton,PauloAmora/peloton,PauloAmora/peloton,apavlo/peloton,prashasthip/peloton,AllisonWang/peloton,prashasthip/peloton