feat: added parallelization on key partitioned data #18919

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gene-bordegaray wants to merge 5 commits intoapache:mainfrom

gene-bordegaray:gene.bordegaray/2025/11/parallelize_key_partitioned_aggregation

Commits on Nov 24, 2025

added parallelization on key partitioned data (opt in only)
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Commits on Nov 25, 2025

Commits on Nov 26, 2025

simplified logic, enforced repartition rules when target partitions != partition groups
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eliminated redundant name-based checking
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committed