[GitHub] [spark] mgaido91 commented on a change in pull request #24583: [SPARK-27679][SQL] Improve LIKE optimization

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mgaido91 commented on a change in pull request #24583: [SPARK-27679][SQL] Improve LIKE optimization
URL: https://github.com/apache/spark/pull/24583#discussion_r283257899
 
 

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 File path: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala
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 @@ -479,12 +479,15 @@ object LikeSimplification extends Rule[LogicalPlan] {
   private val startsAndEndsWith = "([^_%]+)%([^_%]+)".r
   private val contains = "%([^_%]+)%".r
   private val equalTo = "([^_%]*)".r
+  private val endsWithUnderscore = "([^_%]+)_".r
+  private val startsWithUnderscore = "_([^_%]+)".r
+  private val startsAndEndsWithUnderscore = "([^_%]+)_([^_%]+)".r
 
 Review comment:
   this is not a `startsAndEndsWithUnderscore`, but the underscore is inside the pattern

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