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https://issues.apache.org/jira/browse/FLINK-2668?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Greg Hogan updated FLINK-2668:
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Description:
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?
was:
I have come across an issue in my code where I called
{{monospaced}}project(...){{monospaced}} 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?
> 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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