mirror of
https://github.com/scylladb/scylladb.git
synced 2026-04-26 11:30:36 +00:00
111 lines
3.6 KiB
C++
111 lines
3.6 KiB
C++
/*
|
|
* Licensed to the Apache Software Foundation (ASF) under one
|
|
* or more contributor license agreements. See the NOTICE file
|
|
* distributed with this work for additional information
|
|
* regarding copyright ownership. The ASF licenses this file
|
|
* to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance
|
|
* with the License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
/*
|
|
* Copyright 2015 Cloudius Systems
|
|
*
|
|
* Modified by Cloudius Systems
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include "selector.hh"
|
|
#include "types.hh"
|
|
|
|
namespace cql3 {
|
|
|
|
namespace selection {
|
|
|
|
class field_selector : public selector {
|
|
user_type _type;
|
|
size_t _field;
|
|
shared_ptr<selector> _selected;
|
|
public:
|
|
static shared_ptr<factory> new_factory(user_type type, size_t field, shared_ptr<selector::factory> factory) {
|
|
struct field_selector_factory : selector::factory {
|
|
user_type _type;
|
|
size_t _field;
|
|
shared_ptr<selector::factory> _factory;
|
|
|
|
field_selector_factory(user_type type, size_t field, shared_ptr<selector::factory> factory)
|
|
: _type(std::move(type)), _field(field), _factory(std::move(factory)) {
|
|
}
|
|
|
|
virtual sstring column_name() override {
|
|
auto&& name = _type->field_name(_field);
|
|
auto sname = sstring(reinterpret_cast<const char*>(name.begin()), name.size());
|
|
return sprint("%s.%s", _factory->column_name(), sname);
|
|
}
|
|
|
|
virtual data_type get_return_type() override {
|
|
return _type->field_type(_field);
|
|
}
|
|
|
|
shared_ptr<selector> new_instance() override {
|
|
return make_shared<field_selector>(_type, _field, _factory->new_instance());
|
|
}
|
|
|
|
bool is_aggregate_selector_factory() override {
|
|
return _factory->is_aggregate_selector_factory();
|
|
}
|
|
};
|
|
return make_shared<field_selector_factory>(std::move(type), field, std::move(factory));
|
|
}
|
|
|
|
virtual bool is_aggregate() override {
|
|
return false;
|
|
}
|
|
|
|
virtual void add_input(serialization_format sf, result_set_builder& rs) override {
|
|
_selected->add_input(sf, rs);
|
|
}
|
|
|
|
virtual bytes_opt get_output(serialization_format sf) override {
|
|
auto&& value = _selected->get_output(sf);
|
|
if (!value) {
|
|
return std::experimental::nullopt;
|
|
}
|
|
auto&& buffers = _type->split(*value);
|
|
bytes_opt ret;
|
|
if (_field < buffers.size() && buffers[_field]) {
|
|
ret = to_bytes(*buffers[_field]);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
virtual data_type get_type() override {
|
|
return _type->field_type(_field);
|
|
}
|
|
|
|
virtual void reset() {
|
|
_selected->reset();
|
|
}
|
|
|
|
virtual sstring assignment_testable_source_context() const override {
|
|
auto&& name = _type->field_name(_field);
|
|
auto sname = sstring(reinterpret_cast<const char*>(name.begin(), name.size()));
|
|
return sprint("%s.%s", _selected, sname);
|
|
}
|
|
|
|
field_selector(user_type type, size_t field, shared_ptr<selector> selected)
|
|
: _type(std::move(type)), _field(field), _selected(std::move(selected)) {
|
|
}
|
|
};
|
|
|
|
}
|
|
}
|