Github user greghogan commented on the issue:
https://github.com/apache/flink/pull/2029
@StephanEwen it is line 454: `solutionSetCandidate =
siSolutionDeltaCandidate.getInput().getSource();` where I am seeing
`solutionSetCandidate` changed from a `SingleInputPlanNode` to
`DualInputPlanNode`. Why are we not exiting the loops after creating and adding
the `WorksetIterationPlanNode`?
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