Function sql::plan::query::plan_scalar_table_funcs

fn plan_scalar_table_funcs(
    qcx: &QueryContext<'_>, 
    table_funcs: HashMap<TableFunction<Aug>, String>, 
    table_func_names: &mut HashMap<String, Ident>, 
    relation_expr: &HirRelationExpr, 
    from_scope: &Scope
) -> Result<(HirRelationExpr, Scope), PlanError>