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https://issues.apache.org/jira/browse/FLINK-3848?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Fabian Hueske updated FLINK-3848:
---------------------------------
Description:
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}}.
was:
Add a {{ProjectableTableSource}} interface that {{TableSource}}s can implement
which support projection.
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}}.
> 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
>
> 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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