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This\r\noptimization greatly reduces the amount of time to return a response\r\nwhen no `GROUP BY time(...)` clause is present in a query.\r\n\r\n```\r\nbenchmark                                       old ns/op     new ns/op     delta\r\nBenchmarkEngine_CreateIterator_First_1K-8       31738         28327         -10.75%\r\nBenchmarkEngine_CreateIterator_First_100K-8     861782        72030         -91.64%\r\nBenchmarkEngine_CreateIterator_First_1M-8       8599111       88630         -98.97%\r\nBenchmarkEngine_CreateIterator_Last_1K-8        25177         21775         -13.51%\r\nBenchmarkEngine_CreateIterator_Last_100K-8      828121        62467         -92.46%\r\nBenchmarkEngine_CreateIterator_Last_1M-8        8311886       76800         -99.08%\r\n\r\nbenchmark                                       old allocs     new allocs     delta\r\nBenchmarkEngine_CreateIterator_First_1K-8       52             62             +19.23%\r\nBenchmarkEngine_CreateIterator_First_100K-8     68             78             +14.71%\r\nBenchmarkEngine_CreateIterator_First_1M-8       161            171            +6.21%\r\nBenchmarkEngine_CreateIterator_Last_1K-8        52             62             +19.23%\r\nBenchmarkEngine_CreateIterator_Last_100K-8      68             78             +14.71%\r\nBenchmarkEngine_CreateIterator_Last_1M-8        161            171            +6.21%\r\n\r\nbenchmark                                       old bytes     new bytes     delta\r\nBenchmarkEngine_CreateIterator_First_1K-8       11285         12133         +7.51%\r\nBenchmarkEngine_CreateIterator_First_100K-8     54920         55765         +1.54%\r\nBenchmarkEngine_CreateIterator_First_1M-8       69516         70357         +1.21%\r\nBenchmarkEngine_CreateIterator_Last_1K-8        11285         12133         +7.51%\r\nBenchmarkEngine_CreateIterator_Last_100K-8      54919         55765         +1.54%\r\nBenchmarkEngine_CreateIterator_Last_1M-8        69536         70357         +1.18%\r\n```\r\n\r\nFixes #6704.","created_at":"2016-10-20T23:49:21Z","updated_at":"2016-10-25T19:33:55Z","closed_at":"2016-10-25T19:33:55Z","merged_at":"2016-10-25T19:33:55Z","merge_commit_sha":"17eb8cb476dbd6318dbadb40c465d96ea6e13831","assignee":null,"assignees":[],"milestone":{"url":"https://api.github.com/repos/influxdata/influxdb/milestones/56","html_url":"https://github.com/influxdata/influxdb/milestones/1.1.0","labels_url":"https://api.github.com/repos/influxdata/influxdb/milestones/56/labels","id":1807337,"number":56,"title":"1.1.0","description":"Point release to come 2 months after 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