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Posted to reviews@iotdb.apache.org by GitBox <gi...@apache.org> on 2021/10/17 00:49:09 UTC

[GitHub] [iotdb] Plutooooooo removed a comment on pull request #4090: [IOTDB-1810] Compatibility of Apache IoTDB with InfluxDB - Compatibility Scheme

Plutooooooo removed a comment on pull request #4090:
URL: https://github.com/apache/iotdb/pull/4090#issuecomment-944839440


   关于2.3.1.5中“但是这样实际并不会影响查询的正确性,因为一旦Influxdb的Tag顺序确定之后,查询也会按照这个顺序表记录的顺序进行Tag值过滤。所以并不会影响查询的正确性。”由于我之前没有详细看过ioTDB查询语言的语法,我会有这种疑问:我在写查询语句的时候是否需要知道tag所处的层级呢?在2.3.2.5的例子"查询student中(name=A或phone=B或sex=C)且score>97"的查询语句如下:
   select * from root.monitor.student.A where score>97
   select * from root.monitor.student.*.B where score>97
   select * from root.monitor.student.*.*.C where score>97
   看上去是需要知道name的order是0,phone的order是1,sex的order是2,所以才会写出这样的查询语句。如果需要知道tag所处的层级,我觉得在用户文档里可以加上如何查找tag层级的说明,比如查询root.TAG_INFO。如果不需要的话应该是我理解错了......


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