Github user okram commented on a diff in the pull request:
https://github.com/apache/tinkerpop/pull/621#discussion_r123506884
--- Diff:
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/GroupStep.java
---
@@ -79,6 +79,14 @@ public void modulateBy(final Traversal.Admin<?, ?>
kvTraversal) {
}
@Override
+ public void replaceLocalChild(final Traversal.Admin<?, ?>
oldTraversal, final Traversal.Admin<?, ?> newTraversal) {
+ if (null != this.keyTraversal &&
this.keyTraversal.equals(oldTraversal))
+ this.keyTraversal = this.integrateChild(newTraversal);
+ else if (null != this.valueTraversal &&
this.valueTraversal.equals(oldTraversal))
--- End diff --
You will have to add all the `barrier` manipulation work in
`replaceLocalChild` then.
https://github.com/apache/tinkerpop/blob/185ad404011ebd1fb181c83b676ba8aa770c51c4/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/GroupStep.java#L71-L74
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