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From "Jia Li (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SPARK-24130) Data Source V2: Join Push Down
Date Tue, 01 May 2018 01:37:00 GMT
Jia Li created SPARK-24130:
------------------------------

             Summary: Data Source V2: Join Push Down
                 Key: SPARK-24130
                 URL: https://issues.apache.org/jira/browse/SPARK-24130
             Project: Spark
          Issue Type: Sub-task
          Components: SQL
    Affects Versions: 2.3.0
            Reporter: Jia Li


Spark applications often directly query external data sources such as relational databases,
or files. Spark provides Data Sources APIs for accessing structured data through Spark SQL.
Data Sources APIs in both V1 and V2 support optimizations such as Filter push down and Column
pruning which are subset of the functionality that can be pushed down to some data sources.
We’re proposing to extend Data Sources APIs with join push down (JPD). Join push down significantly
improves query performance by reducing the amount of data transfer and exploiting the capabilities
of the data sources such as index access.

Join push down design document is available [here|https://docs.google.com/document/d/1k-kRadTcUbxVfUQwqBbIXs_yPZMxh18-e-cz77O_TaE/edit?usp=sharing].



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