Fabian Hueske created FLINK-3848:
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Summary: Add ProjectableTableSource interface and translation rule
Key: FLINK-3848
URL: https://issues.apache.org/jira/browse/FLINK-3848
Project: Flink
Issue Type: Task
Components: Table API
Reporter: Fabian Hueske
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}}.
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