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%hashData = (
                id   => $total_cdr_count,
...
                col8 => $hold_max_date
        );
        push @output, %hashData;

{"myData":["col7",null,"col5",null,"col3",0,"col8","2007-08-10 00:59:5
+8","col2",0,"id",3951,"col4",null
,"col6",null,"col7",null,"col5",null,"col3",0,"col8","2007-08-10 00:59
+:58","col2",0,"id",3961,"col4"
,null,"col6",null,"col7",null,"col5",null,"col3",0,"col8","2007-08-10 
+00:59:58","col2",0,"id"

{"myData":[{"id":"08-10-2007.00","col2":null,"col3":"I","col4":"0","co
+l5":"3951","col6":null,"col7":"8028"

,"col8":"0"},......