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[SPARK-12762][SQL] Add unit test for SimplifyConditionals optimization rule
This pull request does a few small things: 1. Separated if simplification from BooleanSimplification and created a new rule SimplifyConditionals. In the future we can also simplify other conditional expressions here. 2. Added unit test for SimplifyConditionals. 3. Renamed SimplifyCaseConversionExpressionsSuite to SimplifyStringCaseConversionSuite Author: Reynold Xin <rxin@databricks.com> Closes #10716 from rxin/SPARK-12762.
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- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/conditionalExpressions.scala 6 additions, 4 deletions...ark/sql/catalyst/expressions/conditionalExpressions.scala
- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala 10 additions, 0 deletions...a/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
- sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/CombiningLimitsSuite.scala 2 additions, 1 deletion...e/spark/sql/catalyst/optimizer/CombiningLimitsSuite.scala
- sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/SimplifyConditionalSuite.scala 50 additions, 0 deletions...ark/sql/catalyst/optimizer/SimplifyConditionalSuite.scala
- sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/SimplifyStringCaseConversionSuite.scala 1 addition, 2 deletions...atalyst/optimizer/SimplifyStringCaseConversionSuite.scala
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