Function dig

src/compute-types/src/explain/text.rs:1149–1165

(humanizer: &dyn ExprHumanizer, plan: &Plan)

/// `src/expr/src/explain/text.rs` for the MIR `EXPLAIN OPTIMIZED PLAN` output.
fn humanize_input_name(humanizer: &dyn ExprHumanizer, plan: &Plan, pos: usize) -> String {
    fn dig(humanizer: &dyn ExprHumanizer, plan: &Plan) -> Option<String> {
        use crate::plan::PlanNode::*;
        match &plan.node {
            Get { id, .. } => match id {
                Id::Local(lid) => Some(lid.to_string()),
                Id::Global(gid) => Some(
                    humanizer
                        .humanize_id_unqualified(*gid)
                        .unwrap_or_else(|| gid.to_string()),
                ),
            },
            // Transparent wrappers: keep digging.
            ArrangeBy { input, .. } => dig(humanizer, input),
            Mfp { input, .. } => dig(humanizer, input),
            _ => None,
        }
    }
    match dig(humanizer, plan) {
        Some(name) => format!("%{pos}:{name}"),
        None => format!("%{pos}"),