Why traversal steps are executed from the last step to the first step?

[jeremy...@gmail.com]

Recently I want to know how the step are exected in tinkerpop, but I finded when it started, it was executed from the last step to the first step, and just like reverse . I don't know why do you design in this way? Could you tell me the reason? And another thing is some traversers are confusing for me  like  B_O_Traverser? Could anyone explain to me? thanks.

[Stephen Mallette]

>   I finded when it started, it was executed from the last step to the first step, and just like reverse . I don't know why do you design in this way?

It's a pull based structure, where each step is like an iterator. the last step has to query the step before it to find out what it contains (if anything).

> Could you tell me the reason? And another thing is some traversers are confusing for me  like  B_O_Traverser? 

There are many different types of traversers that carry different features. The more features they require the greater memory/processing they will require. The prefixes applied to the naming of each traverser refer to the features that each implementation has as defined by TraverserRequirements

https://github.com/apache/tinkerpop/blob/414684eec968cb0b2a4e74e198d3a1bcab75cb06/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/traverser/TraverserRequirement.java

So a B_O_Traverser has the Bulk and Object requirements.

On Fri, Apr 1, 2022 at 3:23 AM jeremy...@gmail.com <jeremy...@gmail.com> wrote:

Recently I want to know how the step are exected in tinkerpop, but I finded when it started, it was executed from the last step to the first step, and just like reverse . I don't know why do you design in this way? Could you tell me the reason? And another thing is some traversers are confusing for me  like  B_O_Traverser? Could anyone explain to me? thanks.

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