Function datafusion_physical_expr::expressions::case

pub fn case(
    expr: Option<Arc<dyn PhysicalExpr>>,
    when_thens: Vec<(Arc<dyn PhysicalExpr>, Arc<dyn PhysicalExpr>)>,
    else_expr: Option<Arc<dyn PhysicalExpr>>
) -> Result<Arc<dyn PhysicalExpr>>

Create a CASE expression