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

["Fabian Hueske (JIRA)" <ji...@apache.org>]

Fabian Hueske created FLINK-3849:
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             Summary: 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
            Reporter: Fabian Hueske


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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