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[SPARK-12018][SQL] Refactor common subexpression elimination code
JIRA: https://issues.apache.org/jira/browse/SPARK-12018 The code of common subexpression elimination can be factored and simplified. Some unnecessary variables can be removed. Author: Liang-Chi Hsieh <viirya@appier.com> Closes #10009 from viirya/refactor-subexpr-eliminate.
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- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala 3 additions, 7 deletions...rg/apache/spark/sql/catalyst/expressions/Expression.scala
- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala 9 additions, 25 deletions...park/sql/catalyst/expressions/codegen/CodeGenerator.scala
- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/GenerateUnsafeProjection.scala 2 additions, 2 deletions...talyst/expressions/codegen/GenerateUnsafeProjection.scala
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