8bab51733f
before this change, we rely on the default-generated fmt::formatter created from operator<<, but fmt v10 dropped the default-generated formatter. in this change, we define formatters for `db::functions::function`. please note, because we use `std::ostream` as the parameter of the polymorphism implementation of `function::print()`. without an intrusive change, we have to use `fmt::ostream_formatter` or at least use similar technique to format the `function` instance into an instance of `ostream` first. so instead of implementing a "native" `fmt::formatter`, in this change, we just use `fmt::ostream_formatter`. Refs #13245 Signed-off-by: Kefu Chai <kefu.chai@scylladb.com> Closes scylladb/scylladb#17832
79 lines
2.0 KiB
C++
79 lines
2.0 KiB
C++
/*
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* Copyright (C) 2022-present ScyllaDB
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*
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* Modified by ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: (AGPL-3.0-or-later and Apache-2.0)
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*/
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#pragma once
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#include "types/types.hh"
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#include <vector>
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#include <optional>
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#include <fmt/ostream.h>
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namespace db {
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namespace functions {
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class function_name;
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class function {
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public:
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using opt_bytes = std::optional<bytes>;
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virtual ~function() {}
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virtual const function_name& name() const = 0;
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virtual const std::vector<data_type>& arg_types() const = 0;
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virtual const data_type& return_type() const = 0;
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/**
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* Checks whether the function is a pure function (as in doesn't depend on, nor produce side effects) or not.
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*
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* @return <code>true</code> if the function is a pure function, <code>false</code> otherwise.
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*/
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virtual bool is_pure() const = 0;
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/**
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* Checks whether the function is a native/hard coded one or not.
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*
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* @return <code>true</code> if the function is a native/hard coded one, <code>false</code> otherwise.
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*/
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virtual bool is_native() const = 0;
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virtual bool requires_thread() const = 0;
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/**
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* Checks whether the function is an aggregate function or not.
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*
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* @return <code>true</code> if the function is an aggregate function, <code>false</code> otherwise.
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*/
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virtual bool is_aggregate() const = 0;
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virtual void print(std::ostream& os) const = 0;
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/**
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* Returns the name of the function to use within a ResultSet.
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*
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* @param column_names the names of the columns used to call the function
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* @return the name of the function to use within a ResultSet
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*/
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virtual sstring column_name(const std::vector<sstring>& column_names) const = 0;
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friend class function_call;
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friend std::ostream& operator<<(std::ostream& os, const function& f);
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};
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inline
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std::ostream&
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operator<<(std::ostream& os, const function& f) {
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f.print(os);
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return os;
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}
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}
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}
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template <std::derived_from<db::functions::function> T> struct fmt::formatter<T> : fmt::ostream_formatter {};
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