Add co-group operator - Githubissues

rheem-ecosystem / rheem

Rheem - a cross-platform data processing system

https://rheem-ecosystem.github.io

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Add co-group operator #69

Closed sekruse closed 7 years ago

sekruse commented 7 years ago

This PR addresses #2:

Add a platform-agnostic CoGroupOperator.
Add and map JavaCoGroupOperator and SparkCoGroupOperator.
Reflect the new functionality in both the Scala and Java API.