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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