[SPARK-52311][SQL] Redefine UnionLoop output to not be duplicated if the anchor output is duplicated#51041

Pajaraja wants to merge 5 commits intoapache:masterapache/spark:masterfrom

Pajaraja:pavle-martinovic_data/UnionLoopOutputPajaraja/spark:pavle-martinovic_data/UnionLoopOutputCopy head branch name to clipboard