Github user scwf commented on the pull request:
https://github.com/apache/spark/pull/4186#issuecomment-72152552
If we eliminate the Project too, we can not check "only single UDTF
supported for SELECT clause"
in Batch("Check Analysis").
So here do not change this version, just added a check rule for "single
generator supported for select clause" to CheckMultiAlias.
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