Github user jkbradley commented on the issue: https://github.com/apache/spark/pull/17108 Given further thought, I'd prefer we stick to the API specified in the design doc, with a Correlations object instead of a generic Statistics object. In the future, we may want optional Params such as weightCol, in which case we may switch to a builder pattern for Correlations and ChiSquare and move away from a shared Statistics object. I'm going to proceed with https://github.com/apache/spark/pull/17110 using a separate ChiSquare object.
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