[
https://issues.apache.org/jira/browse/FLINK-3849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15780544#comment-15780544
]
Fabian Hueske commented on FLINK-3849:
--------------------------------------
Do you mean we need a single rule for pushing projection and filters into a
{{BatchTableSourceScan}}, so basically extending the existing
{{PushProjectIntoBatchTableSourceScanRule}} and
{{PushProjectIntoStreamTableSourceScanRule}}?
Can you explain why it would not be possible to have to separate rules?
Thanks, Fabian
> 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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
