[Backport] groupBy v2: Always merge queries.#4042
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fjy merged 1 commit intoapache:0.10.0from Mar 13, 2017
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This fixes apache#4020 because it means the timestamp will always be included for outermost queries. Historicals receiving queries from older brokers will think they're outermost (because CTX_KEY_OUTERMOST isn't set to "false"), so they'll include a timestamp, so the older brokers will be OK.
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Backport of #4023 to 0.10.0.