[jira] [Commented] (FLINK-3849) Add FilterableTableSource interface and translation rule

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-3849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15851277#comment-15851277 ] 

ASF GitHub Bot commented on FLINK-3849:
---------------------------------------

Github user tonycox commented on the issue:

    https://github.com/apache/flink/pull/3166
  
    However I think we need a tool for converting RexNodes to Table API Expressions. 


> Add FilterableTableSource interface and translation rule
> --------------------------------------------------------
>
>                 Key: FLINK-3849
>                 URL: https://issues.apache.org/jira/browse/FLINK-3849
>             Project: Flink
>          Issue Type: New Feature
>          Components: Table API & SQL
>            Reporter: Fabian Hueske
>            Assignee: Anton Solovev
>
> Add a {{FilterableTableSource}} interface for {{TableSource}} implementations which support filter push-down.
> The interface could look as follows
> {code}
> def trait FilterableTableSource {
>   // returns unsupported predicate expression
>   def setPredicate(predicate: Expression): Expression
> }
> {code}
> In addition we need Calcite rules to push a predicate (or parts of it) into a TableScan that refers to a {{FilterableTableSource}}. We might need to tweak the cost model as well to push the optimizer in the right direction.



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