windpiger opened a new pull request #25095: [SPARK-28332][SQL] SQLMetric wrong initValue URL: https://github.com/apache/spark/pull/25095 ## What changes were proposed in this pull request? Currently SQLMetrics.createSizeMetric create a SQLMetric with initValue set to -1. If there is a ShuffleMapStage with lots of Tasks which read 0 bytes data, these tasks will send the metric(the metric value still be the initValue with -1) to Driver, then Driver do metric merge for this Stage in DAGScheduler.updateAccumulators, this will cause the merged metric value of this Stage set to be a negative value. This is incorrect， we should set the initValue to 0 . Another same case in SQLMetrics.createTimingMetric/createNanoTimingMetric ## How was this patch tested?
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