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From "Dawid Wysakowicz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-3848) Add ProjectableTableSource interface and translation rule
Date Wed, 11 May 2016 12:02:13 GMT

    [ https://issues.apache.org/jira/browse/FLINK-3848?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15280018#comment-15280018

Dawid Wysakowicz commented on FLINK-3848:

Sure I will have a look into current state and wait for more info, no hurry.

> Add ProjectableTableSource interface and translation rule
> ---------------------------------------------------------
>                 Key: FLINK-3848
>                 URL: https://issues.apache.org/jira/browse/FLINK-3848
>             Project: Flink
>          Issue Type: New Feature
>          Components: Table API
>            Reporter: Fabian Hueske
>            Assignee: Fabian Hueske
> Add a {{ProjectableTableSource}} interface for {{TableSource}} implementation that support
projection push-down.
> The interface could look as follows
> {code}
> def trait ProjectableTableSource {
>   def setProjection(fields: Array[String]): Unit
> }
> {code}
> In addition we need Calcite rules to push a projection into a TableScan that refers to
a {{ProjectableTableSource}}. We might need to tweak the cost model as well to push the optimizer
in the right direction.
> Moreover, the {{CsvTableSource}} could be extended to implement {{ProjectableTableSource}}.

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