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Posted to issues@flink.apache.org by "Fabian Hueske (JIRA)" <ji...@apache.org> on 2016/04/28 17:58:12 UTC
[jira] [Created] (FLINK-3848) Add ProjectableTableSource interface
and translation rule
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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