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#include "GatherUtils.h"
#include "Sinks.h"
#include "Sources.h"
#include <base/TypeLists.h>
namespace DB::GatherUtils
{
/// Creates IArraySink from ColumnArray
namespace
{
template <typename... Types>
struct ArraySinkCreator;
template <typename Type, typename... Types>
struct ArraySinkCreator<Type, Types...>
{
static std::unique_ptr<IArraySink> create(IColumn & values, ColumnArray::Offsets & offsets, size_t column_size)
{
using ColVecType = ColumnVectorOrDecimal<Type>;
IColumn * not_null_values = &values;
bool is_nullable = false;
if (auto * nullable = typeid_cast<ColumnNullable *>(&values))
{
not_null_values = &nullable->getNestedColumn();
is_nullable = true;
}
if (typeid_cast<ColVecType *>(not_null_values))
{
if (is_nullable)
return std::make_unique<NullableArraySink<NumericArraySink<Type>>>(values, offsets, column_size);
return std::make_unique<NumericArraySink<Type>>(values, offsets, column_size);
}
return ArraySinkCreator<Types...>::create(values, offsets, column_size);
}
};
template <>
struct ArraySinkCreator<>
{
static std::unique_ptr<IArraySink> create(IColumn & values, ColumnArray::Offsets & offsets, size_t column_size)
{
if (typeid_cast<ColumnNullable *>(&values))
return std::make_unique<NullableArraySink<GenericArraySink>>(values, offsets, column_size);
return std::make_unique<GenericArraySink>(values, offsets, column_size);
}
};
}
std::unique_ptr<IArraySink> createArraySink(ColumnArray & col, size_t column_size)
{
using Creator = TypeListChangeRoot<ArraySinkCreator, TypeListNumberWithUUID>;
return Creator::create(col.getData(), col.getOffsets(), column_size);
}
}
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