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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-3848) Add ProjectableTableSource interface and translation rule
Date Tue, 06 Dec 2016 15:11:59 GMT

    [ https://issues.apache.org/jira/browse/FLINK-3848?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15725777#comment-15725777
] 

ASF GitHub Bot commented on FLINK-3848:
---------------------------------------

Github user fhueske commented on a diff in the pull request:

    https://github.com/apache/flink/pull/2810#discussion_r91078629
  
    --- Diff: flink-libraries/flink-table/src/test/scala/org/apache/flink/api/scala/batch/ExplainTest.scala
---
    @@ -20,6 +20,7 @@ package org.apache.flink.api.scala.batch
     
     import org.apache.flink.api.scala._
     import org.apache.flink.api.scala.table._
    +import org.apache.flink.api.scala.utils.CommonTestData
    --- End diff --
    
    Please remove unrelated changes.


> 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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