Add documentation for average aggregator

COOL-cohort / COOL

the source code of the COOL system

https://www.comp.nus.edu.sg/~dbsystem/cool/

Apache License 2.0

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Closed liuchangshiye closed 2 years ago

liuchangshiye commented 2 years ago

Add documentation for the loader

KimballCai commented 2 years ago

Same comment with @Zrealshadow. Add @return annotations