Function datafusion_physical_expr::utils::map_columns_before_projection

pub fn map_columns_before_projection(
    parent_required: &[Arc<dyn PhysicalExpr>],
    proj_exprs: &[(Arc<dyn PhysicalExpr>, String)]
) -> Vec<Arc<dyn PhysicalExpr>>

This function maps back requirement after ProjectionExec to the Executor for its input.