Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/13235#issuecomment-221116748
hm this pull request outlines a problem with whole stage codegen, i.e. it
is too convoluted at the moment and needs cleanup. Looking at the diff it is
difficult to understand why this fixes a problem. We should still fix it, but
really refactor and clean things up soon.
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