feat: make polars-lazy optional behind 'lazy' feature#12

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feat/optional-lazy-dep

Commits on Apr 4, 2026

feat+fix: Phase 1 — _collect_post_opt 콜백 기반 collect_gpu 재구현 + correctness fixes

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feat: Phase 2 quick wins — Not, IsIn, GroupBy Quantile expressions

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perf: Phase 3 — HStack O(1) name lookup + GPU-native scalar broadcast

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feat: Phase 4 — temporal type support for cudf-polars

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feat: Phase 5 — window functions (AExpr::Over) with GroupsToRows mapping

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feat: make polars-lazy an optional dependency behind "lazy" feature

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feat: v0.3.0 — polars Engine::Gpu integration, window functions, temporal types, performance optimizations

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