Method map_expr_to_global

src/expr/src/relation/join_input_mapper.rs:194–199

Takes an expression from the local context of the `index`th input and creates a new version where column references have been remapped to the global context.

(&self, mut expr: C, index: usize)

    /// creates a new version where column references have been remapped to the
    /// global context.
    pub fn map_expr_to_global<C: Columns + Sized>(&self, mut expr: C, index: usize) -> C {
        expr.visit_columns(|c| {
            *c += self.prior_arities[index];
        });
        expr
    }

    /// Remap column numbers from the global to the local context.
    /// Returns a 2-tuple `(<new column number>, <index of input>)`