fn get_physical_expr_pair(
expr: &Expr,
input_dfschema: &DFSchema,
session_state: &SessionState,
) -> Result<(Arc<dyn PhysicalExpr>, String)>fn get_physical_expr_pair(
expr: &Expr,
input_dfschema: &DFSchema,
session_state: &SessionState,
) -> Result<(Arc<dyn PhysicalExpr>, String)>