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https://issues.apache.org/jira/browse/FLINK-3848?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15666724#comment-15666724
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ASF GitHub Bot commented on FLINK-3848:
---------------------------------------
GitHub user tonycox opened a pull request:
https://github.com/apache/flink/pull/2810
[FLINK-3848] Add ProjectableTableSource interface and translation rule.
Extend CsvTableSource to implement projection
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/tonycox/flink FLINK-3848
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/2810.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #2810
----
commit 95f55a3783ff849357b58d06f3b8c99b20edbe5e
Author: tonycox <[email protected]>
Date: 2016-11-07T16:18:31Z
[FLINK-3848] Add ProjectableTableSource interface and translation rule.
Extend CsvTableSource to implement projection
----
> 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 & SQL
> Reporter: Fabian Hueske
> Assignee: Anton Solovev
>
> 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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