feat(cubestore): execute sorted partial aggregate per partition below the merge, propagate LIMIT into it#10995

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waralexrom wants to merge 10 commits into

cubestore-inline-aggregate-optimization

Commits on Jun 8, 2026

feat(cubestore): push sorted partial aggregate below merge, propagate LIMIT into it
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feat(cubestore): per-partition TailLimit below merge, sliding tail window
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fix(cubestore): strict aggregate limit contract, limit descent to the first aggregate
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fix(cubestore): limit descent through projections, tripwire for unrecognized shapes
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fix(cubestore): bound the tail limit window by the limit, not by batch size
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docs(cubestore): note intentionally unnarrowed statistics and the defensive threshold guard
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feat(cubestore): coalesce instead of sort merge under global aggregates
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feat(cubestore): descend LIMIT to workers for GROUP BY without ORDER BY
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feat(cubestore): push bounded Sort(fetch=N) to workers for non-prefix ORDER BY
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test(cubestore): exclude new limit-pushdown tests from migration harness
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