influxdb/influxdb — pull request #1247 by benbjohnson (2014-12-18 18:11:51+00:00)
Title: Add group by support for tags.

## Overview

This commit adds GROUP BY support for tags. Previously only the interval could be grouped by.

## Queries

This query is now supported:

```
SELECT sum(value)
FROM cpu
WHERE time >= now() - 3h
GROUP BY time(1h), host
```