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decorrelate_exists

uqa_sql::binding::correlation

Function decorrelate_exists 

Source 
pub fn decorrelate_exists(
    context: CorrelationContext<'_>,
    plan: &QueryPlan,
) -> Result<Option<DecorrelatedExistsPlan>, SQLError>
Expand description

Turn a simple correlated equality EXISTS into an uncorrelated key query.

The caller materializes the returned inner key rows once and probes them with outer_keys, which is the physical equivalent of a hash semi-join.