Hi, By the way. If so, no "boolean" data type? And why there is no default_string_encoding.
Best, ----------------------------------- Xiangdong Huang School of Software, Tsinghua University 黄向东 清华大学 软件学院 Xiangdong Huang <saint...@gmail.com> 于2019年9月2日周一 下午11:50写道： > Hi, > > I think it should be called as "schema" rather than "metadata"... > > Best, > ----------------------------------- > Xiangdong Huang > School of Software, Tsinghua University > > 黄向东 > 清华大学 软件学院 > > > Jialin Qiao <qj...@mails.tsinghua.edu.cn> 于2019年9月2日周一 下午11:46写道： > >> Hi, >> >> I created an issue about creating metadata automatically [1]. >> >> To achieve this, we can introduce four configuration parameters: >> >> auto_create_metadata=false >> default_storage_group_level=2 >> default_int_encoding=RLE >> default_floating_encoding=GORILLA >> >> Supposing we receive an insert statement "insert into root.sg1.d1(time, >> s1, s2) values(1, 1, 1)". >> When the "auto_create_metadata" is set to true and the user didn't create >> metadata before, we can set storage group to root.sg1 (because the >> default_storage_group_level is 2) and create two timeseries >> "root.sg1.d1.s1" and "root.sg1.d1.s2". >> >> The datatype can be inferred from the value type. If it is "1", we treat >> it as long. If it is a "floating number", we treat it as double. >> >> I'd like to have your suggestions. >> >> [1] https://issues.apache.org/jira/browse/IOTDB-193 >> >> Best, >> -- >> Jialin Qiao >> School of Software, Tsinghua University >> >> 乔嘉林 >> 清华大学 软件学院 >> >> > -----原始邮件----- >> > 发件人: "Jialin Qiao (Jira)" <j...@apache.org> >> > 发送时间: 2019-09-03 13:12:00 (星期二) >> > 收件人: dev@iotdb.apache.org >> > 抄送: >> > 主题: [jira] [Created] (IOTDB-193) Create metadata automatically in the >> insertion >> > >> > Jialin Qiao created IOTDB-193: >> > --------------------------------- >> > >> > Summary: Create metadata automatically in the insertion >> > Key: IOTDB-193 >> > URL: https://issues.apache.org/jira/browse/IOTDB-193 >> > Project: Apache IoTDB >> > Issue Type: New Feature >> > Reporter: Jialin Qiao >> > >> > >> > Setting storage group and creating time series can be troublesome when >> using IoTDB in applications. >> > >> > Let's look at the typical scenes: >> > >> > The devices send messages to Kafka. Each message includes: factoryId, >> deviceId, timestamp, s1_value, s2_value, s3_value. >> > >> > The consumer of Kafka needs to consume the messages and organize the >> data into an insert statement: "insert into root.factoryId.deviceId(time, >> s1, s2, s3) values(timestamp, s1_value, s2_value, s3_value)" >> > >> > Before inserting the data into IoTDB, the consumer needs to judge >> whether the storage group and time series are created before, which is not >> convenient. Typically, there are 3 ways to do that: >> > # Caching the storage group and timeseries created before in the >> consumer >> > # Query from IoTDB whether a storage group and timeseries exists >> > # Directly create metadata regardless of whether created before >> > >> > Could IoTDB support creating metadata (at least time series) >> automatically when receiving an insertion? >> > >> > >> > >> > >> > >> > -- >> > This message was sent by Atlassian Jira >> > (v8.3.2#803003) >> >
