akar_processor::physical::order_aggregate::topk

Struct PhysicalTopK

pub struct PhysicalTopK {
    pub sort_keys: Vec<(u32, bool)>,
    pub limit: u64,
    pub offset: u64,
}

Expand description

Fused ORDER BY + LIMIT using a BinaryHeap (O(n log k) vs O(n log n)).

Maintains a max-heap of size (limit + offset). Pops the worst entry when capacity is exceeded. Uses DirectedSortKey to encode sort direction into the comparison, so the BinaryHeap’s natural max-heap behavior correctly retains the best entries.

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§sort_keys: Vec<(u32, bool)>§limit: u64§offset: u64

Trait Implementations§

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impl PhysicalOperatorExec for PhysicalTopK

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fn operator_type(&self) -> &str

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fn execute(&self, input: Vec<DataChunk>) -> OperatorResult

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impl UnwindSafe for PhysicalTopK

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