Method new

datafusion-examples/examples/custom_data_source/custom_datasource.rs:195–207

(
        projections: Option<&Vec<usize>>,
        schema: SchemaRef,
        db: CustomDataSource,
    )

impl CustomExec {
    #[expect(clippy::needless_pass_by_value)]
    fn new(
        projections: Option<&Vec<usize>>,
        schema: SchemaRef,
        db: CustomDataSource,
    ) -> Self {
        let projected_schema = project_schema(&schema, projections).unwrap();
        let cache = Self::compute_properties(projected_schema.clone());
        Self {
            db,
            projected_schema,
            cache: Arc::new(cache),
        }
    }

    /// This function creates the cache object that stores the plan properties such as schema, equivalence properties, ordering, partitioning, etc.
    fn compute_properties(schema: SchemaRef) -> PlanProperties {