Struct mz_expr::NaiveOneByOneAggr

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pub struct NaiveOneByOneAggr { /* private fields */ }
Expand description

Naive implementation of OneByOneAggr, suitable for stuff like const folding, but too slow for rendering. This relies only on infrastructure available in mz-expr. It simply saves all the given input, and calls the given AggregateFunc’s eval method when asked about the current aggregate. (For Accumulable and Hierarchical aggregations, the rendering has more efficient implementations, but for Basic aggregations even the rendering uses this naive implementation.)

Trait Implementations§

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impl Debug for NaiveOneByOneAggr

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl OneByOneAggr for NaiveOneByOneAggr

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fn new(agg: &AggregateFunc, reverse: bool) -> Self

The reverse parameter makes the aggregations process input elements in reverse order. This has an effect only for non-commutative aggregations, e.g. list_agg. These are currently only some of the Basic aggregations. (Basic aggregations are handled by NaiveOneByOneAggr).
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fn give(&mut self, d: &Datum<'_>)

Pushes one input element into the aggregation.
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fn get_current_aggregate<'a>(&self, temp_storage: &'a RowArena) -> Datum<'a>

Returns the value of the aggregate computed on the given values so far.

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Copy self into the target container, returning an index that allows to look up the corresponding read item.
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