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Is there a standard DSL for data integrity checking?

I came across CSV files that come from clients and which can contain hundreds of thousands of lines. Is there a DSL (or a wildly popular library in Java or Python) that can efficiently perform calculations based on this information, applying various rules for issuing warnings and errors (user configurable, of course)?

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Can you imagine a DSL that would do this? What will the rules look like?

A few months ago I worked on such a problem - in the end it turned out to be more difficult than it seemed the first.

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