Greg Hogan created FLINK-2668:
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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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