LucaCanali opened a new pull request #26675: [SPARK-30041][SQL][WEBUI] Add Codegen Stage Id to Stage DAG visualization in Web UI URL: https://github.com/apache/spark/pull/26675 ### What changes were proposed in this pull request? SPARK-29894 provides information on the Codegen Stage Id in WEBUI for SQL Plan graphs. Similarly, this proposes to add Codegen Stage Id in the DAG visualization for Stage execution. DAGs for Stage execution are available in the WEBUI under the Jobs and Stages tabs. ### Why are the changes needed? This is proposed as an aid for drill-down analysis of complex SQL statement execution, as it is not always easy to match parts of the SQL Plan graph with the corresponding Stage DAG execution graph. Adding Codegen Stage Id for WholeStageCodegen operations makes this task easier. ### Does this PR introduce any user-facing change? Stage DAG visualization in the WEBUI will show codegen stage id for WholeStageCodegen operations, as in the example snippet from the WEBUI, Jobs tab (the query used in the example is TPCDS 2.4 q14a):  ### How was this patch tested? Manually tested, see also example snippet.
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