Himanshu 1fae6513e1 add "subtotalsSpec" attribute to groupBy query (#5280)
* add subtotalsSpec attribute to groupBy query

* dont sent subtotalsSpec to downstream nodes from broker and other updates

* address review comment

* fix checkstyle issues after merge to master

* add docs for subtotalsSpec feature

* address doc review comments
2018-08-28 17:46:38 -07:00
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