feat(cubestore): dictionary group keys & group-by-limit trim aggregate#11128

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waralexrom wants to merge 17 commits into

cubestore-dicts

Commits on Jun 20, 2026

feat(cubestore): dict-encoded string group keys for inline aggregate (wip, behind flag)
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feat(cubestore): port group-by-limit partial aggregate (renamed from topk), wip behind flag
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feat(cubestore): engage group-by-limit trim at distributed execution via worker_sort_and_limit
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feat(cubestore): extend group-by-limit pushdown to bare LIMIT and through UNION
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feat(cubestore): dict-aware group keys + native dictionary parquet read
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perf(cubestore): vectorize dictionary group-key remap
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test(cubestore): cover dictionary group-key remap and native dict read
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feat(cubestore): parallel hash-final worker top-k (experimental, flag-gated)
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feat(cubestore): per-partition N-way top-k aggregate (experimental, flag-gated)
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refactor(cubestore): drop sorted worker top-k, hash-final is the only path
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feat(cubestore): dict-encode in-memory chunks on scan
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fix(cubestore): handle dictionary group keys in aggregate top-k
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chore(cubestore): default dictionary encoding and group-by-limit trim off (opt-in via env)
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refactor(cubestore): address PR review on group-by-limit/dict
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test(cubestore): ignore worker_sort_and_limit_cluster (worker limit-pushdown Sort not emitted)
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fix(cubestore): restore worker-side sort bounding for the inline limit path
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chore(cubestore): drop test scratch dirs committed by mistake; ignore them
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