Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/7392#issuecomment-121397381
@davies it is actually true -- our support for mutable state in non-codegen
version is actually not correct right now.
For example, we have bugs w.r.t. non-determinism for Random because we
don't have proper expression init (and as a result calling the expression in
local mode without serialziation/deserialization breaks random's determinism
given a specific seed). Overtime we should just have explicit init for
expressions. This is the attempt to add that for code-gen version first.
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