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[SPARK-10475] [SQL] improve column prunning for Project on Sort
Sometimes we can't push down the whole `Project` though `Sort`, but we still have a chance to push down part of it. Author: Wenchen Fan <cloud0fan@outlook.com> Closes #8644 from cloud-fan/column-prune.
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- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala 15 additions, 4 deletions...a/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
- sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/ColumnPruningSuite.scala 11 additions, 0 deletions...che/spark/sql/catalyst/optimizer/ColumnPruningSuite.scala
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