perf: Coalesce batches before sorting in ExternalSorter to reduce merge fan-in #21629

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Draft

mbutrovich wants to merge 6 commits into apache:main from mbutrovich:externalsorter

Draft

perf: Coalesce batches before sorting in ExternalSorter to reduce merge fan-in #21629

Merge branch 'main' into externalsorter

GitHub Advanced Security / CodeQL succeeded Apr 16, 2026 in 2s

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