Add support for AggregateFunction #14

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	34s
3.10 CH=22.5.1.2079	44s
3.10 CH=19.3.5	35s
3.10 CH=18.14.9	32s
3.11 CH=23.8.4.69	34s
3.11 CH=22.5.1.2079	30s
3.11 CH=19.3.5	30s
3.11 CH=18.14.9	24s
3.12 CH=23.8.4.69	33s
3.12 CH=22.5.1.2079	32s
3.12 CH=19.3.5	32s
3.12 CH=18.14.9	41s
Indicate completion to coveralls.io	0s
	6m 53s

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