UNIQUE constraint check

[mike-podolskiy90]

We're working on Camtrap-DP and using this project for producing datapackages. Recently we noticed it does not validate unique constraints Link

Are there plans for implementing this please?

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Please preserve this line to notify @iSnow (lead of this repository)

[iSnow]

I am the only developer here, and I'm mostly developing those features I need or those that seem super critical. Unfortunately, UNIQUE-constraints aren't on that list.

Best regards

[mike-podolskiy90]

@iSnow I have implemented the PK check in my fork. Should I submit a PR for it?

[iSnow]

@mike-podolskiy90 Please do.

I haven't checked your branch for the logic, so how did you consider performance in case the CSV data is large files? One of the things that have kept me from unique constraints is I creating a huge performance hit.

[mike-podolskiy90]

I've submitted a PR, you can check it out frictionlessdata/datapackage-java#65