MaxGekk 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_r376724819
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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:
You can keep `lastPattern` as `Pattern`, and compare it to the current
pattern via `lastPattern.pattern() == patternStr`. No need to keep
`lastPattern` as a string.
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