Method projection_mapping

datafusion/physical-expr/src/projection.rs:247–257

Creates a ProjectionMapping from this projection

(
        &self,
        input_schema: &SchemaRef,
    )

    /// Creates a ProjectionMapping from this projection
    pub fn projection_mapping(
        &self,
        input_schema: &SchemaRef,
    ) -> Result<ProjectionMapping> {
        ProjectionMapping::try_new(
            self.exprs
                .iter()
                .map(|p| (Arc::clone(&p.expr), p.alias.clone())),
            input_schema,
        )
    }

    /// Iterate over a clone of the projection expressions.
    pub fn expr_iter(&self) -> impl Iterator<Item = Arc<dyn PhysicalExpr>> + '_ {