f3eade2f62
Drop the AGPL license in favor of a source-available license. See the blog post [1] for details. [1] https://www.scylladb.com/2024/12/18/why-were-moving-to-a-source-available-license/
79 lines
2.1 KiB
C++
79 lines
2.1 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: (LicenseRef-ScyllaDB-Source-Available-1.0 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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