fcb8d040e8
Instead of lengthy blurbs, switch to single-line, machine-readable standardized (https://spdx.dev) license identifiers. The Linux kernel switched long ago, so there is strong precedent. Three cases are handled: AGPL-only, Apache-only, and dual licensed. For the latter case, I chose (AGPL-3.0-or-later and Apache-2.0), reasoning that our changes are extensive enough to apply our license. The changes we applied mechanically with a script, except to licenses/README.md. Closes #9937
71 lines
1.4 KiB
C++
71 lines
1.4 KiB
C++
/*
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*/
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/*
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* Modified by ScyllaDB
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*
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* Copyright (C) 2014-present 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 "function.hh"
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#include <optional>
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namespace cql3 {
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namespace functions {
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/**
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* Performs a calculation on a set of values and return a single value.
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*/
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class aggregate_function : public virtual function {
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public:
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class aggregate;
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/**
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* Creates a new <code>Aggregate</code> instance.
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*
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* @return a new <code>Aggregate</code> instance.
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*/
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virtual std::unique_ptr<aggregate> new_aggregate() = 0;
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/**
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* An aggregation operation.
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*/
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class aggregate {
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public:
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using opt_bytes = aggregate_function::opt_bytes;
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virtual ~aggregate() {}
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/**
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* Adds the specified input to this aggregate.
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*
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* @param protocol_version native protocol version
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* @param values the values to add to the aggregate.
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*/
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virtual void add_input(cql_serialization_format sf, const std::vector<opt_bytes>& values) = 0;
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/**
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* Computes and returns the aggregate current value.
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*
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* @param protocol_version native protocol version
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* @return the aggregate current value.
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*/
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virtual opt_bytes compute(cql_serialization_format sf) = 0;
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/**
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* Reset this aggregate.
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*/
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virtual void reset() = 0;
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};
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};
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}
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}
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