Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/8234#issuecomment-131782155
@cloud-fan I thought we can avoid the explicit giving the name for the
alias, however, it requires lots of code change, probably we'd better not to
make happens in the release window.
As we did in lots of places, I gave the alias as it's expression value in
string, which should solve this bug.
I like your idea to avoid giving the duplicate alias, but it will be great
if you can make it a shared code as we do need it in lots of place.
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