Cannot access a stored value after fold
I think i cannot find the docs related to this behavior. I stored a value in a variable then tried to access it after an aggregation, but it seems not found anymore, what could be the reason?
And what possible approach I can solve?
And what possible approach I can solve?
Solution
once you use a reducing-barrier step, like
fold()groupBy()ReducingBarrierStep: All of the traversers prior to the step are processed by a reduce function and once all the previous traversers are processed, a single "reduced value" traverser is emitted to the next step. Note that the path history leading up to a reducing barrier step is destroyed given its many-to-one nature.Once you are reduced to a single traverser from many traversers, that path sort of loses meaning. Often folks work around this by rewriting their traversal to use
aggregate()
Apache TinkerPop is an open source graph computing framework and the home of the Gremlin graph query language.
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