Antalya 25.8.14 backport of #87687 - Fix two-level aggregation when using Merge over Distributed#1328

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mkmkme wants to merge 3 commits intoantalya-25.8from

backports/antalya-25.8/87687

Commits on Jan 21, 2026

Merge pull request #87687 from c-end/two-level-aggregation-merge-distributed

nickitat
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mkmkme
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Merge pull request #88406 from azat/tests/03403_distributed_merge_two_level_aggregation

azat
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mkmkme
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removed the nonexistent setting from the test
mkmkme
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