Github user viirya commented on a diff in the pull request:
    --- Diff: 
    @@ -77,9 +77,40 @@ case class ProjectExec(projectList: 
Seq[NamedExpression], child: SparkPlan)
    -  override def outputOrdering: Seq[SortOrder] = child.outputOrdering
    +  override def outputOrdering: Seq[SortOrder] =
    +    ProjectHelper.outputOrdering(projectList, child.outputOrdering, child)
    +object ProjectHelper {
    +  /**
    +   * Determins the outputOrdering property for [[ProjectExec]] and 
    --- End diff --
    If the attribute `a is not existing in the output anymore, isn't 
sortorder('a) meaningless?

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