xiangdong Huang created IOTDB-358: ------------------------------------- Summary: Questions about the `group by` down-samplying clause Key: IOTDB-358 URL: https://issues.apache.org/jira/browse/IOTDB-358 Project: Apache IoTDB Issue Type: Bug Affects Versions: 0.9.0 Reporter: xiangdong Huang
When reading issue #331, I read the `group by` document again and find some confusing contents: V0.9: [http://iotdb.apache.org/#/Documents/0.9.0/chap5/sec2] # (minor), typo, Fig 5.2 rather than Fig 3.2 # The first parameter of the GROUP BY statement above is the time interval for dividing the time axis. Taking this parameter (1d) as time interval and the default origin as the dividing origin, the time axis is divided into several continuous intervals, which are [0,1d], [1d, 2d], [2d, 3d], etc. My question is, is the data point at 1d calculated twice? V0.10: [http://iotdb.apache.org/#/Documents/progress/chap5/sec2] the syntax is quite different with v0.9.0. I originally thought it was an improvement comparing with 0.9, but when I read the document, I find it loses the ability to define the start point of the timestamp for splitting the time window. Can someone tell me why to design like this? -- This message was sent by Atlassian Jira (v8.3.4#803005)