mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-28 02:21:59 +00:00
318 lines
12 KiB
C++
318 lines
12 KiB
C++
#pragma once
|
||
|
||
#include <Poco/SharedPtr.h>
|
||
|
||
#include <DB/Core/Field.h>
|
||
#include <DB/Common/Exception.h>
|
||
#include <DB/Core/ErrorCodes.h>
|
||
#include <DB/Columns/ColumnVector.h>
|
||
#include <DB/Columns/IColumn.h>
|
||
#include <DB/DataTypes/IDataType.h>
|
||
|
||
|
||
namespace DB
|
||
{
|
||
|
||
using Poco::SharedPtr;
|
||
|
||
|
||
class IColumnConst : public IColumn
|
||
{
|
||
public:
|
||
bool isConst() const override { return true; }
|
||
virtual ColumnPtr convertToFullColumn() const = 0;
|
||
};
|
||
|
||
|
||
/** Столбец-константа может содержать внутри себя само значение,
|
||
* или, в случае массивов, SharedPtr от значения-массива,
|
||
* чтобы избежать проблем производительности при копировании очень больших массивов.
|
||
*
|
||
* T - тип значения,
|
||
* DataHolder - как значение хранится в таблице (либо T, либо SharedPtr<T>)
|
||
* Derived должен реализовать методы getDataFromHolderImpl - получить ссылку на значение из holder-а.
|
||
*
|
||
* Для строк и массивов реализации sizeOfField и byteSize могут быть некорректными.
|
||
*/
|
||
template <typename T, typename DataHolder, typename Derived>
|
||
class ColumnConstBase : public IColumnConst
|
||
{
|
||
protected:
|
||
size_t s;
|
||
DataHolder data;
|
||
DataTypePtr data_type;
|
||
|
||
T & getDataFromHolder() { return static_cast<Derived *>(this)->getDataFromHolderImpl(); }
|
||
const T & getDataFromHolder() const { return static_cast<const Derived *>(this)->getDataFromHolderImpl(); }
|
||
|
||
ColumnConstBase(size_t s_, const DataHolder & data_, DataTypePtr data_type_)
|
||
: s(s_), data(data_), data_type(data_type_) {}
|
||
|
||
public:
|
||
typedef T Type;
|
||
typedef typename NearestFieldType<T>::Type FieldType;
|
||
|
||
std::string getName() const override { return "ColumnConst<" + TypeName<T>::get() + ">"; }
|
||
bool isNumeric() const override { return IsNumber<T>::value; }
|
||
bool isFixed() const override { return IsNumber<T>::value; }
|
||
size_t sizeOfField() const override { return sizeof(T); }
|
||
ColumnPtr cloneResized(size_t s_) const override { return new Derived(s_, data, data_type); }
|
||
size_t size() const override { return s; }
|
||
Field operator[](size_t n) const override { return FieldType(getDataFromHolder()); }
|
||
void get(size_t n, Field & res) const override { res = FieldType(getDataFromHolder()); }
|
||
|
||
ColumnPtr cut(size_t start, size_t length) const override
|
||
{
|
||
return new Derived(length, data, data_type);
|
||
}
|
||
|
||
void insert(const Field & x) override
|
||
{
|
||
if (x.get<FieldType>() != FieldType(getDataFromHolder()))
|
||
throw Exception("Cannot insert different element into constant column " + getName(),
|
||
ErrorCodes::CANNOT_INSERT_ELEMENT_INTO_CONSTANT_COLUMN);
|
||
++s;
|
||
}
|
||
|
||
void insertData(const char * pos, size_t length) override
|
||
{
|
||
throw Exception("Cannot insert element into constant column " + getName(), ErrorCodes::NOT_IMPLEMENTED);
|
||
}
|
||
|
||
void insertFrom(const IColumn & src, size_t n) override
|
||
{
|
||
if (getDataFromHolder() != static_cast<const Derived &>(src).getDataFromHolder())
|
||
throw Exception("Cannot insert different element into constant column " + getName(),
|
||
ErrorCodes::CANNOT_INSERT_ELEMENT_INTO_CONSTANT_COLUMN);
|
||
++s;
|
||
}
|
||
|
||
void insertDefault() override { ++s; }
|
||
|
||
StringRef serializeValueIntoArena(size_t n, Arena & arena, char const *& begin) const override
|
||
{
|
||
throw Exception("Method serializeValueIntoArena is not supported for " + getName(), ErrorCodes::NOT_IMPLEMENTED);
|
||
}
|
||
|
||
const char * deserializeAndInsertFromArena(const char * pos) override
|
||
{
|
||
throw Exception("Method deserializeAndInsertFromArena is not supported for " + getName(), ErrorCodes::NOT_IMPLEMENTED);
|
||
}
|
||
|
||
ColumnPtr filter(const Filter & filt) const override
|
||
{
|
||
if (s != filt.size())
|
||
throw Exception("Size of filter doesn't match size of column.", ErrorCodes::SIZES_OF_COLUMNS_DOESNT_MATCH);
|
||
|
||
return new Derived(countBytesInFilter(filt), data, data_type);
|
||
}
|
||
|
||
ColumnPtr replicate(const Offsets_t & offsets) const override
|
||
{
|
||
if (s != offsets.size())
|
||
throw Exception("Size of offsets doesn't match size of column.", ErrorCodes::SIZES_OF_COLUMNS_DOESNT_MATCH);
|
||
|
||
size_t replicated_size = 0 == s ? 0 : offsets.back();
|
||
return new Derived(replicated_size, data, data_type);
|
||
}
|
||
|
||
size_t byteSize() const override { return sizeof(data) + sizeof(s); }
|
||
|
||
ColumnPtr permute(const Permutation & perm, size_t limit) const override
|
||
{
|
||
if (limit == 0)
|
||
limit = s;
|
||
else
|
||
limit = std::min(s, limit);
|
||
|
||
if (perm.size() < limit)
|
||
throw Exception("Size of permutation is less than required.", ErrorCodes::SIZES_OF_COLUMNS_DOESNT_MATCH);
|
||
|
||
return new Derived(limit, data, data_type);
|
||
}
|
||
|
||
int compareAt(size_t n, size_t m, const IColumn & rhs_, int nan_direction_hint) const override
|
||
{
|
||
const Derived & rhs = static_cast<const Derived &>(rhs_);
|
||
return getDataFromHolder() < rhs.getDataFromHolder() /// TODO: правильное сравнение NaN-ов в константных столбцах.
|
||
? -1
|
||
: (data == rhs.data
|
||
? 0
|
||
: 1);
|
||
}
|
||
|
||
void getPermutation(bool reverse, size_t limit, Permutation & res) const override
|
||
{
|
||
res.resize(s);
|
||
for (size_t i = 0; i < s; ++i)
|
||
res[i] = i;
|
||
}
|
||
|
||
DataTypePtr & getDataType() { return data_type; }
|
||
const DataTypePtr & getDataType() const { return data_type; }
|
||
};
|
||
|
||
|
||
/** шаблон для столбцов-констант (столбцов одинаковых значений).
|
||
*/
|
||
template <typename T>
|
||
class ColumnConst final : public ColumnConstBase<T, T, ColumnConst<T>>
|
||
{
|
||
private:
|
||
friend class ColumnConstBase<T, T, ColumnConst<T>>;
|
||
|
||
T & getDataFromHolderImpl() { return this->data; }
|
||
const T & getDataFromHolderImpl() const { return this->data; }
|
||
|
||
public:
|
||
/// Для ColumnConst<Array> data_type_ должен быть ненулевым.
|
||
/// Для ColumnConst<String> data_type_ должен быть ненулевым, если тип данных FixedString.
|
||
ColumnConst(size_t s_, const T & data_, DataTypePtr data_type_ = DataTypePtr())
|
||
: ColumnConstBase<T, T, ColumnConst<T>>(s_, data_, data_type_) {}
|
||
|
||
StringRef getDataAt(size_t n) const override;
|
||
StringRef getDataAtWithTerminatingZero(size_t n) const override;
|
||
UInt64 get64(size_t n) const override;
|
||
|
||
/** Более эффективные методы манипуляции */
|
||
T & getData() { return this->data; }
|
||
const T & getData() const { return this->data; }
|
||
|
||
/** Преобразование из константы в полноценный столбец */
|
||
ColumnPtr convertToFullColumn() const override;
|
||
|
||
void getExtremes(Field & min, Field & max) const override
|
||
{
|
||
min = typename ColumnConstBase<T, T, ColumnConst<T>>::FieldType(this->data);
|
||
max = typename ColumnConstBase<T, T, ColumnConst<T>>::FieldType(this->data);
|
||
}
|
||
};
|
||
|
||
|
||
template <>
|
||
class ColumnConst<Array> final : public ColumnConstBase<Array, SharedPtr<Array>, ColumnConst<Array>>
|
||
{
|
||
private:
|
||
friend class ColumnConstBase<Array, SharedPtr<Array>, ColumnConst<Array>>;
|
||
|
||
Array & getDataFromHolderImpl() { return *data; }
|
||
const Array & getDataFromHolderImpl() const { return *data; }
|
||
|
||
public:
|
||
/// data_type_ должен быть ненулевым.
|
||
ColumnConst(size_t s_, const Array & data_, DataTypePtr data_type_ = DataTypePtr())
|
||
: ColumnConstBase<Array, SharedPtr<Array>, ColumnConst<Array>>(s_, new Array(data_), data_type_) {}
|
||
|
||
ColumnConst(size_t s_, const SharedPtr<Array> & data_, DataTypePtr data_type_ = DataTypePtr())
|
||
: ColumnConstBase<Array, SharedPtr<Array>, ColumnConst<Array>>(s_, data_, data_type_) {}
|
||
|
||
StringRef getDataAt(size_t n) const override;
|
||
StringRef getDataAtWithTerminatingZero(size_t n) const override;
|
||
UInt64 get64(size_t n) const override;
|
||
|
||
/** Более эффективные методы манипуляции */
|
||
const Array & getData() const { return *data; }
|
||
|
||
/** Преобразование из константы в полноценный столбец */
|
||
ColumnPtr convertToFullColumn() const override;
|
||
|
||
void getExtremes(Field & min, Field & max) const override
|
||
{
|
||
min = FieldType();
|
||
max = FieldType();
|
||
}
|
||
};
|
||
|
||
|
||
typedef ColumnConst<String> ColumnConstString;
|
||
typedef ColumnConst<Array> ColumnConstArray;
|
||
|
||
|
||
template <typename T> ColumnPtr ColumnConst<T>::convertToFullColumn() const
|
||
{
|
||
ColumnVector<T> * res_ = new ColumnVector<T>;
|
||
ColumnPtr res = res_;
|
||
res_->getData().assign(this->s, this->data);
|
||
return res;
|
||
}
|
||
|
||
|
||
template <> ColumnPtr ColumnConst<String>::convertToFullColumn() const;
|
||
|
||
|
||
template <typename T> StringRef ColumnConst<T>::getDataAt(size_t n) const
|
||
{
|
||
throw Exception("Method getDataAt is not supported for " + this->getName(), ErrorCodes::NOT_IMPLEMENTED);
|
||
}
|
||
|
||
template <> inline StringRef ColumnConst<String>::getDataAt(size_t n) const
|
||
{
|
||
return StringRef(data);
|
||
}
|
||
|
||
template <typename T> UInt64 ColumnConst<T>::get64(size_t n) const
|
||
{
|
||
throw Exception("Method get64 is not supported for " + this->getName(), ErrorCodes::NOT_IMPLEMENTED);
|
||
}
|
||
|
||
/// Для элементарных типов.
|
||
template <typename T> StringRef getDataAtImpl(const T & data)
|
||
{
|
||
return StringRef(reinterpret_cast<const char *>(&data), sizeof(data));
|
||
}
|
||
|
||
|
||
template <typename T> UInt64 get64IntImpl(const T & data)
|
||
{
|
||
return data;
|
||
}
|
||
|
||
template <typename T> UInt64 get64FloatImpl(const T & data)
|
||
{
|
||
union
|
||
{
|
||
T src;
|
||
UInt64 res;
|
||
};
|
||
|
||
res = 0;
|
||
src = data;
|
||
return res;
|
||
}
|
||
|
||
template <> inline StringRef ColumnConst<UInt8 >::getDataAt(size_t n) const { return getDataAtImpl(data); }
|
||
template <> inline StringRef ColumnConst<UInt16 >::getDataAt(size_t n) const { return getDataAtImpl(data); }
|
||
template <> inline StringRef ColumnConst<UInt32 >::getDataAt(size_t n) const { return getDataAtImpl(data); }
|
||
template <> inline StringRef ColumnConst<UInt64 >::getDataAt(size_t n) const { return getDataAtImpl(data); }
|
||
template <> inline StringRef ColumnConst<Int8 >::getDataAt(size_t n) const { return getDataAtImpl(data); }
|
||
template <> inline StringRef ColumnConst<Int16 >::getDataAt(size_t n) const { return getDataAtImpl(data); }
|
||
template <> inline StringRef ColumnConst<Int32 >::getDataAt(size_t n) const { return getDataAtImpl(data); }
|
||
template <> inline StringRef ColumnConst<Int64 >::getDataAt(size_t n) const { return getDataAtImpl(data); }
|
||
template <> inline StringRef ColumnConst<Float32 >::getDataAt(size_t n) const { return getDataAtImpl(data); }
|
||
template <> inline StringRef ColumnConst<Float64 >::getDataAt(size_t n) const { return getDataAtImpl(data); }
|
||
|
||
template <> inline UInt64 ColumnConst<UInt8 >::get64(size_t n) const { return get64IntImpl(data); }
|
||
template <> inline UInt64 ColumnConst<UInt16 >::get64(size_t n) const { return get64IntImpl(data); }
|
||
template <> inline UInt64 ColumnConst<UInt32 >::get64(size_t n) const { return get64IntImpl(data); }
|
||
template <> inline UInt64 ColumnConst<UInt64 >::get64(size_t n) const { return get64IntImpl(data); }
|
||
template <> inline UInt64 ColumnConst<Int8 >::get64(size_t n) const { return get64IntImpl(data); }
|
||
template <> inline UInt64 ColumnConst<Int16 >::get64(size_t n) const { return get64IntImpl(data); }
|
||
template <> inline UInt64 ColumnConst<Int32 >::get64(size_t n) const { return get64IntImpl(data); }
|
||
template <> inline UInt64 ColumnConst<Int64 >::get64(size_t n) const { return get64IntImpl(data); }
|
||
template <> inline UInt64 ColumnConst<Float32 >::get64(size_t n) const { return get64FloatImpl(data); }
|
||
template <> inline UInt64 ColumnConst<Float64 >::get64(size_t n) const { return get64FloatImpl(data); }
|
||
|
||
|
||
template <typename T> StringRef ColumnConst<T>::getDataAtWithTerminatingZero(size_t n) const
|
||
{
|
||
return getDataAt(n);
|
||
}
|
||
|
||
template <> inline StringRef ColumnConst<String>::getDataAtWithTerminatingZero(size_t n) const
|
||
{
|
||
return StringRef(data.data(), data.size() + 1);
|
||
}
|
||
|
||
|
||
}
|