pengbo opened a new pull request #24389: [SPARK-27482][SQL][Web UI]: Show BroadcastHashJoinExec numOutputRows statistics info on SparkSQL UI page URL: https://github.com/apache/spark/pull/24389 ## What changes were proposed in this pull request? Currently, the SparkSQL UI page shows only actual metric info in each SparkPlan node. However with `statistics` info may help us understand how the plan is designed and the reason it runs slowly. This PR is to show `BroadcastHashJoinExec` `numOutputRows` `statistic` info on SparkSQL UI page first when it's available. The main changes: 1. Add `stats` field in `SparkPlan` 2. Initialize `BroadcastHashJoinExec` with the `stats` in `Join` `LogicalPlan` 3. Add `stats` field in `SQLMetric` and show it on UI page when it's available ## How was this patch tested? Regarding unit test has been added, manual UI test has been tested <img width="311" alt="SPARK-27482-1" src="https://user-images.githubusercontent.com/1247590/56264561-7d8d4e00-6119-11e9-9ea3-9b19634ab9b6.png";>
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