Github user davies commented on the pull request:
https://github.com/apache/spark/pull/7392#issuecomment-121395525
@cloud-fan Actually, we can access the Expression object in generated Java
code (see Expression.genCode), so it's not true that we can not support
Expression that have mutable state in it.
For Random and MonotonicallyIncreasingID, we will not have much benefit
from the codegen version (they both are LeafExpression), I'd like not to
complicate them. Correct me, if there are real performance difference. For
others, it can access the Expression object to fetch or update the state.
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