Method mfp_filter

src/expr/src/interpret.rs:446–455

Specifically, this evaluates the map and filters stages of an MFP: summarize each of the map expressions, then `and` together all of the filters.

(&self, mfp: &MapFilterProject)

    /// Specifically, this evaluates the map and filters stages of an MFP: summarize each of the
    /// map expressions, then `and` together all of the filters.
    fn mfp_filter(&self, mfp: &MapFilterProject) -> Self::Summary {
        let mfp_eval = MfpEval::new(self, mfp.input_arity, &mfp.expressions);
        // NB: self should not be used after this point!
        let predicates = mfp
            .predicates
            .iter()
            .map(|(_, e)| mfp_eval.expr(e))
            .collect();
        mfp_eval.variadic(&And.into(), predicates)
    }

    /// Similar to [Self::mfp_filter], but includes the additional temporal filters that have been
    /// broken out.