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Greg Hogan updated FLINK-2668: ------------------------------ Description: I have come across an issue in my code where I called {monospace}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 {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? > 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 > {monospace}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)