Github user jiangxb1987 commented on a diff in the pull request:
    --- Diff: 
    @@ -266,8 +266,8 @@ class ColumnPruningSuite extends PlanTest {
       test("Column pruning on Window with useless aggregate functions") {
         val input = LocalRelation(', 'b.string, 'c.double, '
    -    val winSpec = windowSpec('a :: Nil, 'b.asc :: Nil, UnspecifiedFrame)
    --- End diff --
    The attribute `'b` is neither in the group by expressions nor an aggregate 
function, so we use `'d` instead.

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