Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/12351#issuecomment-209741133
A high level question: given a lot of expression code, we will group them
into several blocks, and each block will be put into a method. For the method,
previously we only use a single `InternalRow` parameter, as we assume all
expressions only need the input row. To support `currentVars`, a simple idea is
just adding `currentVars` as parameters, but this may introduce a very long
parameter list and reach java limit, how do you fix it?
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