Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1292#discussion_r42849790
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/operators/shipping/OutputEmitter.java
---
@@ -143,14 +148,25 @@ public OutputEmitter(ShipStrategyType strategy,
TypeComparator<T> comparator, Pa
//
--------------------------------------------------------------------------------------------
+ private int[] forward() {
+ if (this.channels == null) {
--- End diff --
This method preserves the behavior of `FORWARD` only if `numberOfChannels`
is always 0 when `FORWARD` is configured which is out of control of the
`OutputEmitter`.
Should we add a check somewhere (e.g., in this condition to reduce the
overhead) to ensure that `numberOfChannels` is acutally 0 for `FORWARD`?
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