pengbo opened a new pull request #24413: [SPARK-27518][SQL][UI] Show statistics in Optimized Logical Plan in the "Details" On SparkSQL ui page when CBO is enabled URL: https://github.com/apache/spark/pull/24413 ## What changes were proposed in this pull request? Statistics snapshot info with current query is really helpful to find out why the query runs slowly, especially caused by bad rejoin order when CBO is enabled. This PR is to show statistics in Optimized Logical Plan in the "Details" On SparkSQL ui page when CBO is enabled. 1. Refactoring `QueryExecution` String method to avoid duplicate code 2. Add statistic info to physicalPlanDescription when CBO is enabled  ## How was this patch tested? Manual test & according UT has been added
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