Xiao Li commented on SPARK-22390:

[~huaxingao] It is hard to say whether the design is good or not before we 
implement a data source using your proposal. Before we starting the evaluation, 
it sounds like we need to convert JDBC to data source V2 first.

> Aggregate push down
> -------------------
>                 Key: SPARK-22390
>                 URL: https://issues.apache.org/jira/browse/SPARK-22390
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 2.3.0
>            Reporter: Wenchen Fan
>            Priority: Major

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