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[SPARK-13732][SPARK-13797][SQL] Remove projectList from Window and El…
…iminate useless Window #### What changes were proposed in this pull request? `projectList` is useless. Its value is always the same as the child.output. Remove it from the class `Window`. Removal can simplify the codes in Analyzer and Optimizer. This PR is based on the discussion started by cloud-fan in a separate PR: apache#5604 (comment) This PR also eliminates useless `Window`. cloud-fan yhuai #### How was this patch tested? Existing test cases cover it. Author: gatorsmile <gatorsmile@gmail.com> Author: xiaoli <lixiao1983@gmail.com> Author: Xiao Li <xiaoli@Xiaos-MacBook-Pro.local> Closes apache#11565 from gatorsmile/removeProjListWindow.
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