beliefer opened a new pull request #27497: [SPARK-30245][SQL][FOLLOWUP] Improve regex expression when pattern not changed URL: https://github.com/apache/spark/pull/27497 ### What changes were proposed in this pull request? This PR follows up https://github.com/apache/spark/pull/26875. ### Why are the changes needed? When pattern is not static, we should avoid compile pattern every time if some pattern is same. ### Does this PR introduce any user-facing change? No ### How was this patch tested? Exists UT.
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