[SPARK-26281][WebUI] Duration column of task table should be executor run time instead of real duration #23240
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What changes were proposed in this pull request?
In PR #23081 , the duration column is changed to executor run time. The behavior is consistent with the summary metrics table and previous Spark version.
However, after PR #21688, the issue can be reproduced again.
How was this patch tested?
Before the change, we can see:
After the change, the issues are fixed:
![image](https://user-images.githubusercontent.com/1097932/49533069-06d57e00-f8f9-11e8-872b-402e3014f557.png)