[jira] [Created] (FLINK-5698) Add NestedFieldsProjectableTableSource interface

[Shang Yuanchun (Jira)]

Anton Solovev created FLINK-5698:
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             Summary: Add NestedFieldsProjectableTableSource interface
                 Key: FLINK-5698
                 URL: https://issues.apache.org/jira/browse/FLINK-5698
             Project: Flink
          Issue Type: Improvement
          Components: Table API & SQL
            Reporter: Anton Solovev


Add a NestedFieldsProjectableTableSource interface for some TableSource implementation that support nesting projection push-down.
The interface could look as follows
{code}
def trait ProjectableTableSource {
  def projectNestedFields(fields: Array[String]): NestedFieldsProjectableTableSource[T]
}
{code}
This interface works together with ProjectableTableSource



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