mirror of
https://github.com/scylladb/scylladb.git
synced 2026-04-28 20:27:03 +00:00
ee81453596
A user-defined aggregate is represented as an aggregate which calls its state function on each input row and then finalizes its execution by calling its final function on the final state, after all rows were already processed.
56 lines
1.7 KiB
C++
56 lines
1.7 KiB
C++
/*
|
|
* Copyright (C) 2021-present ScyllaDB
|
|
*/
|
|
|
|
/*
|
|
* This file is part of Scylla.
|
|
*
|
|
* Scylla is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Affero General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* Scylla is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include "abstract_function.hh"
|
|
#include "scalar_function.hh"
|
|
#include "aggregate_function.hh"
|
|
|
|
namespace cql3 {
|
|
namespace functions {
|
|
|
|
class user_aggregate : public abstract_function, public aggregate_function{
|
|
bytes_opt _initcond;
|
|
::shared_ptr<scalar_function> _sfunc;
|
|
::shared_ptr<scalar_function> _finalfunc;
|
|
public:
|
|
user_aggregate(function_name fname, bytes_opt initcond, ::shared_ptr<scalar_function> sfunc, ::shared_ptr<scalar_function> finalfunc);
|
|
virtual std::unique_ptr<aggregate_function::aggregate> new_aggregate() override;
|
|
virtual bool is_pure() const override;
|
|
virtual bool is_native() const override;
|
|
virtual bool is_aggregate() const override;
|
|
virtual bool requires_thread() const override;
|
|
|
|
const scalar_function& sfunc() const {
|
|
return *_sfunc;
|
|
}
|
|
const scalar_function& finalfunc() const {
|
|
return *_finalfunc;
|
|
}
|
|
const bytes_opt& initcond() const {
|
|
return _initcond;
|
|
}
|
|
};
|
|
|
|
}
|
|
}
|