[SPARK-27482][SQL][WEBUI] Show estimated BroadcastHashJoinExec numOutputRows statistics info on SparkSQL UI page#24666

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pengbo:stats_physical_plan

Commits on May 21, 2019

Commits on May 23, 2019

loginPlan tag could be empty in BroadcastHashJoinExec which is not planned by SparkStrategies
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Commits on May 24, 2019

merge master
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