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[SPARK-13549][SQL] Refactor the Optimizer Rule CollapseProject
#### What changes were proposed in this pull request? The PR https://github.com/apache/spark/pull/10541 changed the rule `CollapseProject` by enabling collapsing `Project` into `Aggregate`. It leaves a to-do item to remove the duplicate code. This PR is to finish this to-do item. Also added a test case for covering this change. #### How was this patch tested? Added a new test case. liancheng Could you check if the code refactoring is fine? Thanks! Author: gatorsmile <gatorsmile@gmail.com> Closes #11427 from gatorsmile/collapseProjectRefactor.
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- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala 45 additions, 56 deletions...a/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
- sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/CollapseProjectSuite.scala 25 additions, 1 deletion...e/spark/sql/catalyst/optimizer/CollapseProjectSuite.scala
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