[SPARK-54136][SQL] Extract plan merging logic from MergeScalarSubqueries to PlanMerger#52835

peter-toth wants to merge 4 commits intoapache:masterapache/spark:masterfrom

peter-toth:SPARK-54136-extract-plan-merging-logicpeter-toth/spark:SPARK-54136-extract-plan-merging-logicCopy head branch name to clipboard