Add support for AggregateFunction #17

Job	Run time
3.7 CH=23.8.4.69	1s
3.7 CH=22.5.1.2079	1s
3.7 CH=19.3.5	1s
3.7 CH=18.14.9	1s
3.8 CH=23.8.4.69	1s
3.8 CH=22.5.1.2079	1s
3.8 CH=19.3.5	1s
3.8 CH=18.14.9	1s
3.9 CH=23.8.4.69	1s
3.9 CH=22.5.1.2079	1s
3.9 CH=19.3.5	1s
3.9 CH=18.14.9	1s
3.10 CH=23.8.4.69	17s
3.10 CH=22.5.1.2079	30s
3.10 CH=19.3.5	55s
3.10 CH=18.14.9	1m 4s
3.11 CH=23.8.4.69	11s
3.11 CH=22.5.1.2079	11s
3.11 CH=19.3.5	11s
3.11 CH=18.14.9	15s
3.12 CH=23.8.4.69	4s
3.12 CH=22.5.1.2079	5s
3.12 CH=19.3.5	7s
3.12 CH=18.14.9	6s
Indicate completion to coveralls.io	0s
	4m 8s

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