Function mz_sql::plan::query::plan_ctes

pub fn plan_ctes(
    qcx: &mut QueryContext<'_>,
    q: &Query<Aug>
) -> Result<Vec<(LocalId, HirRelationExpr, Option<CteDesc>)>, PlanError>

Creates plans for CTEs and introduces them to qcx.ctes.

Returns for each identifier a planned HirRelationExpr value, and an optional shadowed value that can be reinstalled once the planning has completed.