fixed memory leak during runtime group-by
fixed memory leak during runtime group-by
28msec/zorba,28msec/zorba,28msec/zorba,bgarrels/zorba,cezarfx/zorba,28msec/zorba,28msec/zorba,28msec/zorba,28msec/zorba,cezarfx/zorba,bgarrels/zorba,bgarrels/zorba,cezarfx/zorba,28msec/zorba,cezarfx/zorba,bgarrels/zorba,cezarfx/zorba,bgarrels/zorba,cezarfx/zorba,cezarfx/zorba,cezarfx/zorba,bgarrels/zorba,cezarfx/zorba,bgarrels/zorba,bgarrels/zorba,cezarfx/zorba,28msec/zorba