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From "Greg Hogan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-2668) ProjectOperator method to close projection
Date Mon, 14 Sep 2015 18:42:46 GMT
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?



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