190d1b20bf
Since all function overload selection is done by prepare_expression(), we no longer need to implement the assignment_testable interface, so drop it. Since there's now just one implementation of assignment_testable, we can drop it and replace it by the implementation (expressions), but that is left for later.
94 lines
3.1 KiB
C++
94 lines
3.1 KiB
C++
/*
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* Modified by ScyllaDB
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* Copyright (C) 2015-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 "selector.hh"
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#include "cql3/functions/function.hh"
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#include "cql3/functions/function_name.hh"
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#include "cql3/functions/user_aggregate.hh"
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#include "utils/small_vector.hh"
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#include <boost/algorithm/cxx11/any_of.hpp>
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namespace cql3 {
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namespace selection {
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class selector_factories;
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class abstract_function_selector : public selector {
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protected:
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shared_ptr<functions::function> _fun;
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/**
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* The list used to pass the function arguments is recycled to avoid the cost of instantiating a new list
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* with each function call.
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*/
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utils::small_vector<bytes_opt, 4> _args;
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std::vector<shared_ptr<selector>> _arg_selectors;
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const bool _requires_thread;
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public:
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static shared_ptr<factory> new_factory(shared_ptr<functions::function> fun, shared_ptr<selector_factories> factories);
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// If reserve_extra_arg is set, the internal buffer used for holding function argument lists is enlarged to account for
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// an aggregate function's accumulator.
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abstract_function_selector(shared_ptr<functions::function> fun, std::vector<shared_ptr<selector>> arg_selectors, bool reserve_extra_arg = false)
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: _fun(std::move(fun)), _arg_selectors(std::move(arg_selectors)),
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_requires_thread(boost::algorithm::any_of(_arg_selectors, [] (auto& s) { return s->requires_thread(); })
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|| _fun->requires_thread()) {
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_args.resize(_arg_selectors.size() + unsigned(reserve_extra_arg));
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}
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virtual bool requires_thread() const override;
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virtual data_type get_type() const override {
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return _fun->return_type();
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}
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shared_ptr<functions::function> function() const {
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return _fun;
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}
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#if 0
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@Override
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public String toString()
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{
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return new StrBuilder().append(fun.name())
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.append("(")
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.appendWithSeparators(argSelectors, ", ")
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.append(")")
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.toString();
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}
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#endif
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};
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template <typename T /* extends Function */>
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class abstract_function_selector_for : public abstract_function_selector {
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shared_ptr<T> _tfun; // We can't use static_pointer_cast due to virtual inheritance,
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// so store it locally to amortize cost of dynamic_pointer_cast
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protected:
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shared_ptr<T> fun() { return _tfun; }
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shared_ptr<const T> fun() const { return _tfun; }
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public:
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// If reserve_extra_arg is set, the internal buffer used for holding function argument lists is enlarged to account for
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// an aggregate function's accumulator.
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abstract_function_selector_for(shared_ptr<T> fun, std::vector<shared_ptr<selector>> arg_selectors, bool reserve_extra_arg = false)
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: abstract_function_selector(fun, std::move(arg_selectors), reserve_extra_arg)
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, _tfun(dynamic_pointer_cast<T>(fun)) {
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}
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const functions::function_name& name() const {
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return _tfun->name();
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}
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};
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}
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}
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