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[SPARK-2535][SQL] Add StringComparison case to NullPropagation.
`StringComparison` expressions including `null` literal cases could be added to `NullPropagation`. Author: Takuya UESHIN <ueshin@happy-camper.st> Closes #1451 from ueshin/issues/SPARK-2535 and squashes the following commits: e99c237 [Takuya UESHIN] Add some tests. 8f9b984 [Takuya UESHIN] Add StringComparison case to NullPropagation.
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- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala 5 additions, 0 deletions...a/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
- sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/ExpressionEvaluationSuite.scala 22 additions, 1 deletion.../sql/catalyst/expressions/ExpressionEvaluationSuite.scala
- sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/ConstantFoldingSuite.scala 8 additions, 2 deletions...e/spark/sql/catalyst/optimizer/ConstantFoldingSuite.scala
- sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/LikeSimplificationSuite.scala 90 additions, 0 deletions...park/sql/catalyst/optimizer/LikeSimplificationSuite.scala
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