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[SPARK-21059][SQL] LikeSimplification can NPE on null pattern
## What changes were proposed in this pull request? This patch fixes a bug that can cause NullPointerException in LikeSimplification, when the pattern for like is null. ## How was this patch tested? Added a new unit test case in LikeSimplificationSuite. Author: Reynold Xin <rxin@databricks.com> Closes #18273 from rxin/SPARK-21059.
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- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala 21 additions, 16 deletions...org/apache/spark/sql/catalyst/optimizer/expressions.scala
- sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/LikeSimplificationSuite.scala 7 additions, 1 deletion...park/sql/catalyst/optimizer/LikeSimplificationSuite.scala
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