Github user dilipbiswal commented on the pull request:
https://github.com/apache/spark/pull/9981#issuecomment-160877804
@cloud-fan Hi Wenchen, I was thinking about this and want to run an idea by
you. Is it ok if we add the logic to inject the MultiAlias in our analyzer. As
an experiment, i put the following code in ResolveGenerate() and it seems to
work and also i am running the test suites to make sure.
val newProj : Seq[NamedExpression] = projectList.map { expr =>
expr match {
case a @ Alias(g: Generator, name) if g.resolved &&
g.elementTypes.size > 1 && name.equals(a.child.prettyString)
=>
MultiAlias(g, Nil)
case e @ _ => e
}
}
One thing is name.equals(a.child.prettyString) does not really make sure if
its an user specified alias or a system generated one. We can flag an alias to
differentiate if required. Just wanted to know what you thought about this
approach. Thanks in advance.
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