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#include "GatherUtils.h"
#include "Sinks.h"
#include "Sources.h"
#include <base/TypeLists.h>
namespace DB::GatherUtils
{
/// Creates IValueSource from Column
namespace
{
template <typename... Types>
struct ValueSourceCreator;
template <typename Type, typename... Types>
struct ValueSourceCreator<Type, Types...>
{
static std::unique_ptr<IValueSource> create(const IColumn & col, const NullMap * null_map, bool is_const, size_t total_rows)
{
using ColVecType = ColumnVectorOrDecimal<Type>;
if (auto column_vector = typeid_cast<const ColVecType *>(&col))
{
if (null_map)
{
if (is_const)
return std::make_unique<ConstSource<NullableValueSource<NumericValueSource<Type>>>>(*column_vector, *null_map, total_rows);
return std::make_unique<NullableValueSource<NumericValueSource<Type>>>(*column_vector, *null_map);
}
if (is_const)
return std::make_unique<ConstSource<NumericValueSource<Type>>>(*column_vector, total_rows);
return std::make_unique<NumericValueSource<Type>>(*column_vector);
}
return ValueSourceCreator<Types...>::create(col, null_map, is_const, total_rows);
}
};
template <>
struct ValueSourceCreator<>
{
static std::unique_ptr<IValueSource> create(const IColumn & col, const NullMap * null_map, bool is_const, size_t total_rows)
{
if (null_map)
{
if (is_const)
return std::make_unique<ConstSource<NullableValueSource<GenericValueSource>>>(col, *null_map, total_rows);
return std::make_unique<NullableValueSource<GenericValueSource>>(col, *null_map);
}
if (is_const)
return std::make_unique<ConstSource<GenericValueSource>>(col, total_rows);
return std::make_unique<GenericValueSource>(col);
}
};
}
std::unique_ptr<IValueSource> createValueSource(const IColumn & col, bool is_const, size_t total_rows)
{
using Creator = TypeListChangeRoot<ValueSourceCreator, TypeListNumberWithUUID>;
if (const auto * column_nullable = typeid_cast<const ColumnNullable *>(&col))
{
return Creator::create(column_nullable->getNestedColumn(), &column_nullable->getNullMapData(), is_const, total_rows);
}
return Creator::create(col, nullptr, is_const, total_rows);
}
}
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