Adding projection (SELECT) to Record and Relations

CodeLionX / actordb

Actor Database System Framework using Akka

MIT License

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Adding projection (SELECT) to Record and Relations #13

Closed CodeLionX closed 6 years ago

CodeLionX commented 6 years ago

Proposed Changes

capability to project Records and Relations
- record.project(Seq(colDef1, colDef2))
- R.project(Seq(colDef1, colDef2))
- record.project(R) and R2.project(R)
all project-methods return a Try[<result_type]
tests for Record class (RecordBuilder is tested implicitly)

srfc commented 6 years ago

Works well for me and I will merge this, but just to be sure: What should the behaviour be projecting to non-existing columns? Should we change this to a non-successful Either later, too?

CodeLionX commented 6 years ago

I wasn't sure, if there is a use case for this... I think in such a case it is reasonable to just define a behavior and make sure nothing breaks. If you think it is the wrong behavior, you can annotate it in your review or create a new issue.