Function conjunction_opt

datafusion/physical-expr/src/utils/mod.rs:122–131

Create a conjunction of the given predicates. If the input is empty or the return None. If the input contains a single predicate, return Some(predicate). Otherwise, return a Some(..) of a conjunction of the predicates (e.g. `Some(a AND b AND c)`).

(
    predicates: impl IntoIterator<Item = Arc<dyn PhysicalExpr>>,
)

/// If the input contains a single predicate, return Some(predicate).
/// Otherwise, return a Some(..) of a conjunction of the predicates (e.g. `Some(a AND b AND c)`).
pub fn conjunction_opt(
    predicates: impl IntoIterator<Item = Arc<dyn PhysicalExpr>>,
) -> Option<Arc<dyn PhysicalExpr>> {
    predicates
        .into_iter()
        .fold(None, |acc, predicate| match acc {
            None => Some(predicate),
            Some(acc) => Some(Arc::new(BinaryExpr::new(acc, Operator::And, predicate))),
        })
}

/// Assume the predicate is in the form of DNF, split the predicate to a Vec of PhysicalExprs.
///