[jira] [Commented] (CALCITE-477) Add example of "better pushdown via RexShuttle API" to CSV adapter

["Julian Hyde (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-477?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14222160#comment-14222160 ] 

Julian Hyde commented on CALCITE-477:
-------------------------------------

Agreed.

I also think that each change to the demo, such as this, should be accompanied by changes to the tutorial.

> Add example of "better pushdown via RexShuttle API" to CSV adapter
> ------------------------------------------------------------------
>
>                 Key: CALCITE-477
>                 URL: https://issues.apache.org/jira/browse/CALCITE-477
>             Project: Calcite
>          Issue Type: Bug
>    Affects Versions: 1.0.0-incubating
>            Reporter: Vladimir Sitnikov
>            Assignee: Julian Hyde
>
> In https://groups.google.com/forum/#!topic/optiq-dev/MrTKe0e8vuQ Bruno suggested roll-your-own {{RexShuttle}} way to identify the required inputs.
> The advantage of the approach is it can see through calculations and identify the required columns.
> I think it makes sense to include an example of {{InputFinder}}+{{RexInputConverter}} that will show how inputs can be identified out of complex expressions.



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