[GitHub] [spark] beliefer commented on a change in pull request #27497: [SPARK-30245][SQL][FOLLOWUP] Improve regex expression when pattern not changed

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beliefer commented on a change in pull request #27497: [SPARK-30245][SQL][FOLLOWUP] Improve regex expression when pattern not changed
URL: https://github.com/apache/spark/pull/27497#discussion_r376742473
 
 

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 File path: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/regexpExpressions.scala
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 @@ -54,9 +54,20 @@ trait StringRegexExpression extends Expression
     Pattern.compile(escape(str))
   }
 
+  var lastPatternStr: String = null
 
 Review comment:
   Of course，I can do like this. I just followed the way of `RegExpExtract` and `RegExpReplace` here.

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