viirya opened a new pull request #23433: [SPARK-25591][PySpark][SQL][BRANCH-2.2] Avoid overwriting deserialized accumulator URL: https://github.com/apache/spark/pull/23433 ## What changes were proposed in this pull request? If we use accumulators in more than one UDFs, it is possible to overwrite deserialized accumulators and its values. We should check if an accumulator was deserialized before overwriting it in accumulator registry. ## How was this patch tested? Added test.
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