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Posted to reviews@iotdb.apache.org by GitBox <gi...@apache.org> on 2022/08/04 02:17:39 UTC

[GitHub] [iotdb] Wei-hao-Li commented on issue #6751: How to implement this query method

Wei-hao-Li commented on issue #6751:
URL: https://github.com/apache/iotdb/issues/6751#issuecomment-1204679305

   > For the data of the same indicator over a period of time, I want to clean out the data with the same value as the previous one, and only keep the changed data. I want to achieve the same effect as “SELECT a.id ,a.value FROM test a left join test b on a.id+1=b.id where a.value!=b.value” does, but the DML and UDF provided by querying the official website documents seem to have no way to achieve similar effects. How to achieve this effect? thank you
   
   Hi, we have implement a UDF as Built-in Function to do this job, you can see [PR](https://github.com/apache/iotdb/pull/6874).


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