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https://github.com/scylladb/scylladb.git
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d9337152f3
This adds a requires_thread predicate to functions and propagates that up until we get to code that already returns futures. We can then use the predicate to decide if we need to use seastar::async. Signed-off-by: Rafael Ávila de Espíndola <espindola@scylladb.com>
97 lines
3.1 KiB
C++
97 lines
3.1 KiB
C++
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* Modified by ScyllaDB
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* Copyright (C) 2015 ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "abstract_function_selector.hh"
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#include "cql3/functions/scalar_function.hh"
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namespace cql3 {
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namespace selection {
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class scalar_function_selector : public abstract_function_selector_for<functions::scalar_function> {
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public:
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virtual bool is_aggregate() override {
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// We cannot just return true as it is possible to have a scalar function wrapping an aggregation function
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if (_arg_selectors.empty()) {
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return false;
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}
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return _arg_selectors[0]->is_aggregate();
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}
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virtual void add_input(cql_serialization_format sf, result_set_builder& rs) override {
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size_t m = _arg_selectors.size();
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for (size_t i = 0; i < m; ++i) {
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auto&& s = _arg_selectors[i];
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s->add_input(sf, rs);
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}
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}
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virtual void reset() override {
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}
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virtual bytes_opt get_output(cql_serialization_format sf) override {
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size_t m = _arg_selectors.size();
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for (size_t i = 0; i < m; ++i) {
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auto&& s = _arg_selectors[i];
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_args[i] = s->get_output(sf);
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s->reset();
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}
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return fun()->execute(sf, _args);
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}
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virtual bool requires_thread() override;
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scalar_function_selector(shared_ptr<functions::function> fun, std::vector<shared_ptr<selector>> arg_selectors)
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: abstract_function_selector_for<functions::scalar_function>(
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dynamic_pointer_cast<functions::scalar_function>(std::move(fun)), std::move(arg_selectors)) {
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}
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virtual sstring assignment_testable_source_context() const override {
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// FIXME:
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return "FIXME";
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}
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};
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}
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}
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