Method is_valid

datafusion/common/src/functional_dependencies.rs:246–265

Sanity checks if functional dependencies are valid. For example, if there are 10 fields, we cannot receive any index further than 9.

(&self, n_field: usize)

    /// Sanity checks if functional dependencies are valid. For example, if
    /// there are 10 fields, we cannot receive any index further than 9.
    pub fn is_valid(&self, n_field: usize) -> bool {
        self.deps.iter().all(
            |FunctionalDependence {
                 source_indices,
                 target_indices,
                 ..
             }| {
                source_indices
                    .iter()
                    .max()
                    .map(|&max_index| max_index < n_field)
                    .unwrap_or(true)
                    && target_indices
                        .iter()
                        .max()
                        .map(|&max_index| max_index < n_field)
                        .unwrap_or(true)
            },
        )
    }

    /// Adds the `offset` value to `source_indices` and `target_indices` for
    /// each functional dependency.