Method is_localized

src/expr/src/relation/join_input_mapper.rs:249–256

Returns whether the given expr refers to columns of only the `index`th input.

(&self, expr: &impl Columns, index: usize)

    /// Returns whether the given expr refers to columns of only the `index`th input.
    pub fn is_localized(&self, expr: &impl Columns, index: usize) -> bool {
        if let Some(single_input) = self.single_input(expr) {
            if single_input == index {
                return true;
            }
        }
        false
    }

    /// Takes an expression in the global context and looks in `equivalences`
    /// for an equivalent expression (also expressed in the global context) that