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[SPARK-7235] [SQL] Refactor the grouping sets
The logical plan `Expand` takes the `output` as constructor argument, which break the references chain. We need to refactor the code, as well as the column pruning. Author: Cheng Hao <hao.cheng@intel.com> Closes #5780 from chenghao-intel/expand and squashes the following commits: 76e4aa4 [Cheng Hao] revert the change for case insenstive 7c10a83 [Cheng Hao] refactor the grouping sets
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- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala 9 additions, 46 deletions...ala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/namedExpressions.scala 1 addition, 1 deletion...che/spark/sql/catalyst/expressions/namedExpressions.scala
- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala 4 additions, 0 deletions...a/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicOperators.scala 62 additions, 22 deletions...che/spark/sql/catalyst/plans/logical/basicOperators.scala
- sql/core/src/main/scala/org/apache/spark/sql/execution/SparkStrategies.scala 2 additions, 2 deletions...cala/org/apache/spark/sql/execution/SparkStrategies.scala
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