[jira] [Created] (IOTDB-3579) Effectively support alias in last query

["Yuan Tian (Jira)" <ji...@apache.org>]

Yuan Tian created IOTDB-3579:
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             Summary: Effectively support alias in last query
                 Key: IOTDB-3579
                 URL: https://issues.apache.org/jira/browse/IOTDB-3579
             Project: Apache IoTDB
          Issue Type: New Feature
            Reporter: Yuan Tian
         Attachments: image-2022-06-21-13-31-45-287.png

In current mpp version, last query doesn't support timesereis alias, like if you have a timeseries named root.sg.d1.s1 with an alias speed, then you do the query "select last s1, speed from root.sg.d1", you will only get one record, like the following:

!image-2022-06-21-13-31-45-287.png!

which should have two records.

 

In the old standalone IoTDB, it will rightly return two records, but its implementation is not effective. It treat root.sg.d1.s1 and root.sg.d1.speed as two different timesereis, and query them twice.

 

So we hope in new mpp version, we can support alias in last query effectively which means that we should only query once and return two records.



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