Method new

src/expr/src/explain.rs:105–130

(
        id: GlobalId,
        op: Option<&'a MapFilterProject>,
        filter_pushdown: bool,
    )

impl<'a> ExplainSource<'a> {
    pub fn new(
        id: GlobalId,
        op: Option<&'a MapFilterProject>,
        filter_pushdown: bool,
    ) -> ExplainSource<'a> {
        let pushdown_info = if filter_pushdown {
            op.map(|op| {
                let mfp_mapped = MfpEval::new(&Trace, op.input_arity, &op.expressions);
                let pushdown = op
                    .predicates
                    .iter()
                    .filter(|(_, e)| mfp_mapped.expr(e).pushdownable())
                    .map(|(_, e)| e)
                    .collect();
                PushdownInfo { pushdown }
            })
        } else {
            None
        };

        ExplainSource {
            id,
            op,
            pushdown_info,
        }
    }

    #[inline]
    pub fn is_identity(&self) -> bool {