[GitHub] [spark] viirya commented on a change in pull request #26875: [SPARK-30245][SQL] Add cache for Like and RLike when pattern is not static

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viirya commented on a change in pull request #26875: [SPARK-30245][SQL] Add cache for Like and RLike when pattern is not static
URL: https://github.com/apache/spark/pull/26875#discussion_r361085053
 
 

 ##########
 File path: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/regexpExpressions.scala
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 @@ -240,11 +245,16 @@ case class RLike(left: Expression, right: Expression) extends StringRegexExpress
       }
     } else {
       val rightStr = ctx.freshName("rightStr")
-      val pattern = ctx.freshName("pattern")
+      val pattern = ctx.addMutableState(patternClass, "pattern")
+      val lastRightStr = ctx.addMutableState(classOf[String].getName, "lastRightStr")
+
       nullSafeCodeGen(ctx, ev, (eval1, eval2) => {
         s"""
           String $rightStr = $eval2.toString();
-          $patternClass $pattern = $patternClass.compile($rightStr);
+          if ($rightStr != $lastRightStr) {
 
 Review comment:
   Do you mean to use `equals()`?

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