[GitHub] spark pull request #20044: [SPARK-22857] Optimize code by inspecting code
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[GitHub] spark pull request #20044: [SPARK-22857] Optimize code by inspecting code
GitHub user xubo245 opened a pull request: https://github.com/apache/spark/pull/20044 [SPARK-22857] Optimize code by inspecting code Optimize code by inspecting code, including: remove some unused import change invoking array size method to length method use head method