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cardinality_ratio in datafusion::physical_expr::intervals - Rust
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Function datafusion::physical_expr::intervals::cardinality_ratio

source · 
pub fn cardinality_ratio(
    initial_interval: &Interval,
    final_interval: &Interval
) -> Result<f64, DataFusionError>
Expand description

This function computes the selectivity of an operation by computing the cardinality ratio of the given input/output intervals. If this can not be calculated for some reason, it returns 1.0 meaning fullly selective (no filtering).