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Posted to dev@iotdb.apache.org by "Jialin Qiao (Jira)" <ji...@apache.org> on 2020/02/17 03:23:00 UTC

[jira] [Created] (IOTDB-495) Refactor Dataset and Executor in QueryEngine

Jialin Qiao created IOTDB-495:
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             Summary: Refactor Dataset and Executor in QueryEngine
                 Key: IOTDB-495
                 URL: https://issues.apache.org/jira/browse/IOTDB-495
             Project: Apache IoTDB
          Issue Type: Improvement
          Components: Core/Engine
            Reporter: Jialin Qiao


We put too much query logic in dataset, I suggest extracting query process in query executor. The dataset is only used as a data structure.

 

Then, the query process is :

SQL -> Planner -> QueryPlan

QueryPlan -> Query executor -> Dataset

Fetch result -> Query executor -> Dataset

 

We could cache a QueryExecutor in TSServiceImpl, and get a dataset from it at each fetch operation.

 



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