[jira] [Created] (FLINK-2668) ProjectOperator method to close projection

[Shang Yuanchun (Jira)]

Greg Hogan created FLINK-2668:
---------------------------------

             Summary: ProjectOperator method to close projection
                 Key: FLINK-2668
                 URL: https://issues.apache.org/jira/browse/FLINK-2668
             Project: Flink
          Issue Type: Improvement
          Components: Java API
    Affects Versions: master
            Reporter: Greg Hogan
            Priority: Minor


I have come across an issue in my code where I called {noformat}project(...){noformat} on a DataSet which was already a {noformat}ProjectOperator{noformat}. Instead of reducing the number of fields from 2 to 1 this instead increased the number of fields from 2 to 3 resulting in {noformat}org.apache.flink.api.common.functions.InvalidTypesException: Input mismatch: Tuple arity '3' expected but was '1'.{noformat} when processing the next operator.

This can be resolved by adding an optional explicit call to conclude the projection, perhaps {noformat}ProjectOperator.closeProjection(){noformat}. Can this be done without creating a new no-op operator?



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)