akar_processor::physical::order_aggregate::aggregatehashtable

Struct AggregateHashTable

pub struct AggregateHashTable { /* private fields */ }

Expand description

A parallel hash table for aggregation with GROUP BY keys.

Uses rayon thread-local aggregation: each thread builds its own local hash table, then all local tables are merged.

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impl AggregateHashTable

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pub fn new( funcs: Vec<AggregateFunction>, group_by_cols: Vec<u32>, agg_expressions: Vec<Vec<Expression>>, ) -> Self

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pub fn aggregate(&self, chunks: &[DataChunk]) -> OperatorResult

Aggregate all input chunks, optionally in parallel.

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pub fn build_output( &self, groups: &HashMap<u64, Vec<(Value, Vec<AggValueState>)>>, ) -> OperatorResult

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impl UnwindSafe for AggregateHashTable

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