[SPARK-48394][3.5][CORE] Cleanup mapIdToMapIndex on mapoutput unregister#46768

Ngone51 wants to merge 1 commit intoapache:branch-3.5apache/spark:branch-3.5from

Ngone51:SPARK-48394-3.5Ngone51/spark:SPARK-48394-3.5Copy head branch name to clipboard