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#pragma once
#include "Algorithms.h"
#include "ArraySourceVisitor.h"
#include "ArraySinkVisitor.h"
#include "ValueSourceVisitor.h"
namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
}
namespace GatherUtils
{
/// Base classes which selects template function implementation with concrete ArraySource or ArraySink
/// Derived classes should implement selectImpl for ArraySourceSelector and ArraySinkSelector,
/// selectSourceSink for ArraySinkSourceSelector and selectSourcePair for ArraySourcePairSelector
template <typename Base, typename Tuple, int index, typename ... Args>
void callSelectMemberFunctionWithTupleArgument(Tuple & tuple, Args && ... args)
{
if constexpr (index == std::tuple_size<Tuple>::value)
Base::selectImpl(args ...);
else
callSelectMemberFunctionWithTupleArgument<Base, Tuple, index + 1>(tuple, args ..., std::get<index>(tuple));
}
template <typename Base, typename Tuple, int index, typename ... Args>
void callSelectSource(bool is_const, bool is_nullable, Tuple & tuple, Args && ... args)
{
if constexpr (index == std::tuple_size<Tuple>::value)
Base::selectSource(is_const, is_nullable, args ...);
else
callSelectSource<Base, Tuple, index + 1>(is_const, is_nullable, tuple, args ..., std::get<index>(tuple));
}
template <typename Base, typename ... Args>
struct ArraySourceSelectorVisitor final : public ArraySourceVisitorImpl<ArraySourceSelectorVisitor<Base, Args ...>>
{
explicit ArraySourceSelectorVisitor(IArraySource & source, Args && ... args) : packed_args(args ...), array_source(source) {}
using Tuple = std::tuple<Args && ...>;
template <typename Source>
void visitImpl(Source & source)
{
callSelectSource<Base, Tuple, 0>(array_source.isConst(), array_source.isNullable(), packed_args, source);
}
Tuple packed_args;
IArraySource & array_source;
};
template <typename Base>
struct ArraySourceSelector
{
template <typename ... Args>
static void select(IArraySource & source, Args && ... args)
{
ArraySourceSelectorVisitor<Base, Args ...> visitor(source, args ...);
source.accept(visitor);
}
};
template <typename Base, typename ... Args>
struct ArraySinkSelectorVisitor final : public ArraySinkVisitorImpl<ArraySinkSelectorVisitor<Base, Args ...>>
{
explicit ArraySinkSelectorVisitor(Args && ... args) : packed_args(args ...) {}
using Tuple = std::tuple<Args && ...>;
template <typename Sink>
void visitImpl(Sink & sink)
{
callSelectMemberFunctionWithTupleArgument<Base, Tuple, 0>(packed_args, sink);
}
Tuple packed_args;
};
template <typename Base>
struct ArraySinkSelector
{
template <typename ... Args>
static void select(IArraySink & sink, Args && ... args)
{
ArraySinkSelectorVisitor<Base, Args ...> visitor(args ...);
sink.accept(visitor);
}
};
template <typename Base>
struct ArraySourcePairSelector
{
template <typename ... Args>
static void select(IArraySource & first, IArraySource & second, Args && ... args)
{
ArraySourceSelector<Base>::select(first, second, args ...);
}
template <typename FirstSource, typename ... Args>
static void selectSource(bool is_const, bool is_nullable, FirstSource && first, IArraySource & second, Args && ... args)
{
ArraySourceSelector<Base>::select(second, is_const, is_nullable, first, args ...);
}
template <typename SecondSource, typename FirstSource, typename ... Args>
static void selectSource(bool is_second_const, bool is_second_nullable, SecondSource && second,
bool is_first_const, bool is_first_nullable, FirstSource && first, Args && ... args)
{
Base::selectSourcePair(is_first_const, is_first_nullable, first,
is_second_const, is_second_nullable, second, args ...);
}
};
template <typename Base>
struct ArrayAndValueSourceSelectorBySink : public ArraySinkSelector<ArrayAndValueSourceSelectorBySink<Base>>
{
template <typename Sink, typename ... Args>
static void selectImpl(Sink && sink, IArraySource & array_source, IValueSource & value_source, Args && ... args)
{
using SynkType = typename std::decay<Sink>::type;
using ArraySource = typename SynkType::CompatibleArraySource;
using ValueSource = typename SynkType::CompatibleValueSource;
auto check_type = [] (auto source_ptr)
{
if (source_ptr == nullptr)
throw Exception(ErrorCodes::LOGICAL_ERROR, "{} expected {} or {} or {} or {} but got {}",
demangle(typeid(Base).name()),
demangle(typeid(typename SynkType::CompatibleArraySource).name()),
demangle(typeid(ConstSource<typename SynkType::CompatibleArraySource>).name()),
demangle(typeid(typename SynkType::CompatibleValueSource).name()),
demangle(typeid(ConstSource<typename SynkType::CompatibleValueSource>).name()),
demangle(typeid(*source_ptr).name()));
};
auto check_type_and_call_concat = [& sink, & check_type, & args ...] (auto array_source_ptr, auto value_source_ptr)
{
check_type(array_source_ptr);
check_type(value_source_ptr);
Base::selectArrayAndValueSourceBySink(*array_source_ptr, *value_source_ptr, sink, args ...);
};
if (array_source.isConst() && value_source.isConst())
check_type_and_call_concat(typeid_cast<ConstSource<ArraySource> *>(&array_source),
typeid_cast<ConstSource<ValueSource> *>(&value_source));
else if (array_source.isConst())
check_type_and_call_concat(typeid_cast<ConstSource<ArraySource> *>(&array_source),
typeid_cast<ValueSource *>(&value_source));
else if (value_source.isConst())
check_type_and_call_concat(typeid_cast<ArraySource *>(&array_source),
typeid_cast<ConstSource<ValueSource> *>(&value_source));
else
check_type_and_call_concat(typeid_cast<ArraySource *>(&array_source),
typeid_cast<ValueSource *>(&value_source));
}
};
}
}
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