[GitHub] spark pull request: [SPARK-11619][SQL] cannot use UDTF in DataFram...

[dilipbiswal <gi...@git.apache.org>]

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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