How to ensure that two-phase aggregation is taking place here?

[Britannio Jarrett]

Hello, I made a demo project to learn Rama myself. It has a query found here: https://github.com/britannio/rama-e-vehicle-hire/blob/main/src/main/java/org/example/EVModule.java#L251-L263.

From what I understand, two-phase aggregation will be implicitly carried out here and at most 50 tuples will be transferred from each partition to the origin partition?

Also, I'm an undergrad CS student and I'm working on a blog post describing this demo that I made in Rama. Any feedback on the code or the draft post ( https://www.notion.so/britannio/Rama-Reviewed-A-Breakthrough-Paradigm-in-Software-Engineering-06f8e7320a4a4851be54057e3689adeb, comments enabled if you log in) would be appreciated!

[Nathan Marz]

That's correct. Query topologies are implicitly batch blocks. Two-phase aggregation will take place as long as all aggregators used in the batch block support it.

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