Github user viirya commented on the pull request:
https://github.com/apache/spark/pull/4940#issuecomment-77793875
@chenghao-intel These are the random accessors for the row (`SpecificRow`)
objects produced by the projection `GenerateProjection`. So I think they are
not resolved during the analysis nor attribute bounding. The `i` given to `def
apply(i: Int): Any` is just a parameter used to access the `i`-th element in
the row.
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