ClickHouse/dbms/include/DB/Functions/FunctionsMiscellaneous.h
Vitaliy Lyudvichenko a3d72db2aa Added allocatesMemoryInArena() method for aggregate functions.
Fixed runningAccumulate, now it works properly for complex functions.
More accurate threads handling in Aggregator.
2016-09-28 16:28:55 +03:00

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#pragma once
#include <Poco/Net/DNS.h>
#include <common/ClickHouseRevision.h>
#include <DB/Core/Defines.h>
#include <DB/Core/FieldVisitors.h>
#include <DB/IO/WriteBufferFromString.h>
#include <DB/DataTypes/DataTypesNumberFixed.h>
#include <DB/DataTypes/DataTypeString.h>
#include <DB/DataTypes/DataTypeFixedString.h>
#include <DB/DataTypes/DataTypeDate.h>
#include <DB/DataTypes/DataTypeDateTime.h>
#include <DB/DataTypes/DataTypeTuple.h>
#include <DB/DataTypes/DataTypeArray.h>
#include <DB/DataTypes/DataTypeAggregateFunction.h>
#include <DB/Columns/ColumnString.h>
#include <DB/Columns/ColumnFixedString.h>
#include <DB/Columns/ColumnConst.h>
#include <DB/Columns/ColumnVector.h>
#include <DB/Columns/ColumnSet.h>
#include <DB/Columns/ColumnTuple.h>
#include <DB/Columns/ColumnArray.h>
#include <DB/Columns/ColumnAggregateFunction.h>
#include <DB/Common/UnicodeBar.h>
#include <DB/Functions/IFunction.h>
#include <DB/Functions/NumberTraits.h>
#include <DB/Functions/ObjectPool.h>
#include <DB/Interpreters/ExpressionActions.h>
#include <ext/range.hpp>
#include <cmath>
namespace DB
{
namespace ErrorCodes
{
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
extern const int ILLEGAL_INDEX;
extern const int FUNCTION_IS_SPECIAL;
}
/** Вспомогательные функции:
*
* visibleWidth(x) - вычисляет приблизительную ширину при выводе значения в текстовом (tab-separated) виде на консоль.
*
* toTypeName(x) - получить имя типа
* blockSize() - получить размер блока
* materialize(x) - материализовать константу
* ignore(...) - функция, принимающая любые аргументы, и всегда возвращающая 0.
* sleep(seconds) - спит указанное количество секунд каждый блок.
*
* in(x, set) - функция для вычисления оператора IN
* notIn(x, set) - и NOT IN.
*
* tuple(x, y, ...) - функция, позволяющая сгруппировать несколько столбцов
* tupleElement(tuple, n) - функция, позволяющая достать столбец из tuple.
*
* arrayJoin(arr) - особая функция - выполнить её напрямую нельзя;
* используется только чтобы получить тип результата соответствующего выражения.
*
* replicate(x, arr) - создаёт массив такого же размера как arr, все элементы которого равны x;
* например: replicate(1, ['a', 'b', 'c']) = [1, 1, 1].
*
* sleep(n) - спит n секунд каждый блок.
*
* bar(x, min, max, width) - рисует полосу из количества символов, пропорционального (x - min) и равного width при x == max.
*
* version() - возвращает текущую версию сервера в строке.
*
* finalizeAggregation(agg_state) - по состоянию агрегации получить результат.
*
* runningAccumulate(agg_state) - принимает состояния агрегатной функции и возвращает столбец со значениями,
* являющимися результатом накопления этих состояний для множества строк блока, от первой до текущей строки.
*/
static inline UInt64 stringWidth(const UInt8 * pos, const UInt8 * end)
{
UInt64 res = 0;
for (; pos < end; ++pos)
{
if (*pos == '\b' || *pos == '\f' || *pos == '\n' || *pos == '\r' || *pos == '\t' || *pos == '\0' || *pos == '\'' || *pos == '\\')
++res;
if (*pos <= 0x7F || *pos >= 0xC0)
++res;
}
return res;
}
static inline void stringWidthConstant(const String & data, UInt64 & res)
{
res = stringWidth(reinterpret_cast<const UInt8 *>(data.data()), reinterpret_cast<const UInt8 *>(data.data()) + data.size());
}
class FunctionCurrentDatabase : public IFunction
{
const String db_name;
public:
static constexpr auto name = "currentDatabase";
static FunctionPtr create(const Context & context) { return std::make_shared<FunctionCurrentDatabase>(context.getCurrentDatabase()); }
explicit FunctionCurrentDatabase(const String & db_name) : db_name{db_name} {}
String getName() const override {
return name;
}
DataTypePtr getReturnType(const DataTypes & arguments) const override
{
if (arguments.size() != 0)
throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
+ toString(arguments.size()) + ", should be 0.",
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
return std::make_shared<DataTypeString>();
}
void execute(Block & block, const ColumnNumbers & arguments, const size_t result) override
{
block.getByPosition(result).column = std::make_shared<ColumnConstString>(
block.rowsInFirstColumn(), db_name);
}
};
/// Get the host name. Is is constant on single server, but is not constant in distributed queries.
class FunctionHostName : public IFunction
{
public:
static constexpr auto name = "hostName";
static FunctionPtr create(const Context & context) { return std::make_shared<FunctionHostName>(); }
String getName() const override
{
return name;
}
DataTypePtr getReturnType(const DataTypes & arguments) const override
{
if (arguments.size() != 0)
throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
+ toString(arguments.size()) + ", should be 0.",
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
return std::make_shared<DataTypeString>();
}
/** convertToFullColumn needed because in distributed query processing,
* each server returns its own value.
*/
void execute(Block & block, const ColumnNumbers & arguments, size_t result) override
{
block.getByPosition(result).column = ColumnConstString(
block.rowsInFirstColumn(),
Poco::Net::DNS::hostName()).convertToFullColumn();
}
};
class FunctionVisibleWidth : public IFunction
{
public:
static constexpr auto name = "visibleWidth";
static FunctionPtr create(const Context & context) { return std::make_shared<FunctionVisibleWidth>(); }
/// Получить имя функции.
String getName() const override
{
return name;
}
/// Получить тип результата по типам аргументов. Если функция неприменима для данных аргументов - кинуть исключение.
DataTypePtr getReturnType(const DataTypes & arguments) const override
{
if (arguments.size() != 1)
throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
+ toString(arguments.size()) + ", should be 1.",
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
return std::make_shared<DataTypeUInt64>();
}
/// Выполнить функцию над блоком.
void execute(Block & block, const ColumnNumbers & arguments, size_t result) override;
};
/// Returns name of IDataType instance (name of data type).
class FunctionToTypeName : public IFunction
{
public:
static constexpr auto name = "toTypeName";
static FunctionPtr create(const Context & context) { return std::make_shared<FunctionToTypeName>(); }
String getName() const override
{
return name;
}
DataTypePtr getReturnType(const DataTypes & arguments) const override
{
if (arguments.size() != 1)
throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
+ toString(arguments.size()) + ", should be 1.",
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
return std::make_shared<DataTypeString>();
}
void execute(Block & block, const ColumnNumbers & arguments, size_t result) override
{
block.getByPosition(result).column = std::make_shared<ColumnConstString>(
block.rowsInFirstColumn(), block.getByPosition(arguments[0]).type->getName());
}
};
/// Returns name of IColumn instance.
class FunctionToColumnTypeName : public IFunction
{
public:
static constexpr auto name = "toColumnTypeName";
static FunctionPtr create(const Context & context) { return std::make_shared<FunctionToColumnTypeName>(); }
String getName() const override
{
return name;
}
DataTypePtr getReturnType(const DataTypes & arguments) const override
{
if (arguments.size() != 1)
throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
+ toString(arguments.size()) + ", should be 1.",
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
return std::make_shared<DataTypeString>();
}
void execute(Block & block, const ColumnNumbers & arguments, size_t result) override
{
block.getByPosition(result).column = std::make_shared<ColumnConstString>(
block.rowsInFirstColumn(), block.getByPosition(arguments[0]).column->getName());
}
};
class FunctionBlockSize : public IFunction
{
public:
static constexpr auto name = "blockSize";
static FunctionPtr create(const Context & context) { return std::make_shared<FunctionBlockSize>(); }
/// Получить имя функции.
String getName() const override
{
return name;
}
/// Получить тип результата по типам аргументов. Если функция неприменима для данных аргументов - кинуть исключение.
DataTypePtr getReturnType(const DataTypes & arguments) const override
{
if (!arguments.empty())
throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
+ toString(arguments.size()) + ", should be 0.",
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
return std::make_shared<DataTypeUInt64>();
}
/// Выполнить функцию над блоком.
void execute(Block & block, const ColumnNumbers & arguments, size_t result) override
{
size_t size = block.rowsInFirstColumn();
block.getByPosition(result).column = ColumnConstUInt64(size, size).convertToFullColumn();
}
};
class FunctionRowNumberInBlock : public IFunction
{
public:
static constexpr auto name = "rowNumberInBlock";
static FunctionPtr create(const Context & context) { return std::make_shared<FunctionRowNumberInBlock>(); }
/// Получить имя функции.
String getName() const override
{
return name;
}
/// Получить тип результата по типам аргументов. Если функция неприменима для данных аргументов - кинуть исключение.
DataTypePtr getReturnType(const DataTypes & arguments) const override
{
if (!arguments.empty())
throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
+ toString(arguments.size()) + ", should be 0.",
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
return std::make_shared<DataTypeUInt64>();
}
/// Выполнить функцию над блоком.
void execute(Block & block, const ColumnNumbers & arguments, size_t result) override
{
size_t size = block.rowsInFirstColumn();
auto column = std::make_shared<ColumnUInt64>();
auto & data = column->getData();
data.resize(size);
for (size_t i = 0; i < size; ++i)
data[i] = i;
block.getByPosition(result).column = column;
}
};
/** Инкрементальный номер блока среди вызовов этой функции. */
class FunctionBlockNumber : public IFunction
{
private:
std::atomic<size_t> block_number {0};
public:
static constexpr auto name = "blockNumber";
static FunctionPtr create(const Context & context) { return std::make_shared<FunctionBlockNumber>(); }
/// Получить имя функции.
String getName() const override
{
return name;
}
/// Получить тип результата по типам аргументов. Если функция неприменима для данных аргументов - кинуть исключение.
DataTypePtr getReturnType(const DataTypes & arguments) const override
{
if (!arguments.empty())
throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
+ toString(arguments.size()) + ", should be 0.",
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
return std::make_shared<DataTypeUInt64>();
}
/// Выполнить функцию над блоком.
void execute(Block & block, const ColumnNumbers & arguments, size_t result) override
{
size_t current_block_number = block_number++;
block.getByPosition(result).column = ColumnConstUInt64(block.rowsInFirstColumn(), current_block_number).convertToFullColumn();
}
};
/** Incremental number of row within all blocks passed to this function. */
class FunctionRowNumberInAllBlocks : public IFunction
{
private:
std::atomic<size_t> rows {0};
public:
static constexpr auto name = "rowNumberInAllBlocks";
static FunctionPtr create(const Context & context) { return std::make_shared<FunctionRowNumberInAllBlocks>(); }
/// Получить имя функции.
String getName() const override
{
return name;
}
/// Получить тип результата по типам аргументов. Если функция неприменима для данных аргументов - кинуть исключение.
DataTypePtr getReturnType(const DataTypes & arguments) const override
{
if (!arguments.empty())
throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
+ toString(arguments.size()) + ", should be 0.",
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
return std::make_shared<DataTypeUInt64>();
}
/// Выполнить функцию над блоком.
void execute(Block & block, const ColumnNumbers & arguments, size_t result) override
{
size_t rows_in_block = block.rowsInFirstColumn();
size_t current_row_number = rows.fetch_add(rows_in_block);
auto column = std::make_shared<ColumnUInt64>();
auto & data = column->getData();
data.resize(rows_in_block);
for (size_t i = 0; i < rows_in_block; ++i)
data[i] = current_row_number + i;
block.getByPosition(result).column = column;
}
};
class FunctionSleep : public IFunction
{
public:
static constexpr auto name = "sleep";
static FunctionPtr create(const Context & context) { return std::make_shared<FunctionSleep>(); }
/// Получить имя функции.
String getName() const override
{
return name;
}
/// Получить тип результата по типам аргументов. Если функция неприменима для данных аргументов - кинуть исключение.
DataTypePtr getReturnType(const DataTypes & arguments) const override
{
if (arguments.size() != 1)
throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
+ toString(arguments.size()) + ", should be 1.",
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
if (!typeid_cast<const DataTypeFloat64 *>(&*arguments[0]) &&
!typeid_cast<const DataTypeFloat32 *>(&*arguments[0]) &&
!typeid_cast<const DataTypeUInt64 *>(&*arguments[0]) &&
!typeid_cast<const DataTypeUInt32 *>(&*arguments[0]) &&
!typeid_cast<const DataTypeUInt16 *>(&*arguments[0]) &&
!typeid_cast<const DataTypeUInt8 *>(&*arguments[0]))
throw Exception("Illegal type " + arguments[0]->getName() + " of argument of function " + getName() + ", expected Float64",
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
return std::make_shared<DataTypeUInt8>();
}
/// Выполнить функцию над блоком.
void execute(Block & block, const ColumnNumbers & arguments, size_t result) override
{
IColumn * col = block.getByPosition(arguments[0]).column.get();
double seconds;
size_t size = col->size();
if (ColumnConst<Float64> * column = typeid_cast<ColumnConst<Float64> *>(col))
seconds = column->getData();
else if (ColumnConst<Float32> * column = typeid_cast<ColumnConst<Float32> *>(col))
seconds = static_cast<double>(column->getData());
else if (ColumnConst<UInt64> * column = typeid_cast<ColumnConst<UInt64> *>(col))
seconds = static_cast<double>(column->getData());
else if (ColumnConst<UInt32> * column = typeid_cast<ColumnConst<UInt32> *>(col))
seconds = static_cast<double>(column->getData());
else if (ColumnConst<UInt16> * column = typeid_cast<ColumnConst<UInt16> *>(col))
seconds = static_cast<double>(column->getData());
else if (ColumnConst<UInt8> * column = typeid_cast<ColumnConst<UInt8> *>(col))
seconds = static_cast<double>(column->getData());
else
throw Exception("The argument of function " + getName() + " must be constant.", ErrorCodes::ILLEGAL_COLUMN);
/// Не спим, если блок пустой.
if (size > 0)
usleep(static_cast<unsigned>(seconds * 1e6));
/// convertToFullColumn needed, because otherwise (constant expression case) function will not get called on each block.
block.getByPosition(result).column = ColumnConst<UInt8>(size, 0).convertToFullColumn();
}
};
class FunctionMaterialize : public IFunction
{
public:
static constexpr auto name = "materialize";
static FunctionPtr create(const Context & context) { return std::make_shared<FunctionMaterialize>(); }
/// Получить имя функции.
String getName() const override
{
return name;
}
/// Получить тип результата по типам аргументов. Если функция неприменима для данных аргументов - кинуть исключение.
DataTypePtr getReturnType(const DataTypes & arguments) const override
{
if (arguments.size() != 1)
throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
+ toString(arguments.size()) + ", should be 1.",
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
return arguments[0];
}
/// Выполнить функцию над блоком.
void execute(Block & block, const ColumnNumbers & arguments, size_t result) override
{
const auto & src = block.getByPosition(arguments[0]).column;
if (auto converted = src->convertToFullColumnIfConst())
block.getByPosition(result).column = converted;
else
block.getByPosition(result).column = src;
}
};
template <bool negative, bool global> struct FunctionInName;
template <> struct FunctionInName<false, false> { static constexpr auto name = "in"; };
template <> struct FunctionInName<false, true> { static constexpr auto name = "globalIn"; };
template <> struct FunctionInName<true, false> { static constexpr auto name = "notIn"; };
template <> struct FunctionInName<true, true> { static constexpr auto name = "globalNotIn"; };
template <bool negative, bool global>
class FunctionIn : public IFunction
{
public:
static constexpr auto name = FunctionInName<negative, global>::name;
static FunctionPtr create(const Context & context) { return std::make_shared<FunctionIn>(); }
String getName() const override
{
return name;
}
DataTypePtr getReturnType(const DataTypes & arguments) const override
{
if (arguments.size() != 2)
throw Exception("Number of arguments for function '" + getName() + "' doesn't match: passed "
+ toString(arguments.size()) + ", should be 2.",
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
return std::make_shared<DataTypeUInt8>();
}
void execute(Block & block, const ColumnNumbers & arguments, size_t result) override
{
/// Second argument must be ColumnSet.
ColumnPtr column_set_ptr = block.getByPosition(arguments[1]).column;
const ColumnSet * column_set = typeid_cast<const ColumnSet *>(&*column_set_ptr);
if (!column_set)
throw Exception("Second argument for function '" + getName() + "' must be Set; found " + column_set_ptr->getName(),
ErrorCodes::ILLEGAL_COLUMN);
Block block_of_key_columns;
/// First argument may be tuple or single column.
const ColumnTuple * tuple = typeid_cast<const ColumnTuple *>(block.getByPosition(arguments[0]).column.get());
const ColumnConstTuple * const_tuple = typeid_cast<const ColumnConstTuple *>(block.getByPosition(arguments[0]).column.get());
if (tuple)
block_of_key_columns = tuple->getData();
else if (const_tuple)
block_of_key_columns = static_cast<const ColumnTuple &>(*const_tuple->convertToFullColumn()).getData();
else
block_of_key_columns.insert(block.getByPosition(arguments[0]));
block.getByPosition(result).column = column_set->getData()->execute(block_of_key_columns, negative);
}
};
class FunctionTuple : public IFunction
{
public:
static constexpr auto name = "tuple";
static FunctionPtr create(const Context & context) { return std::make_shared<FunctionTuple>(); }
String getName() const override
{
return name;
}
DataTypePtr getReturnType(const DataTypes & arguments) const override
{
if (arguments.size() < 1)
throw Exception("Function " + getName() + " requires at least one argument.", ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
return std::make_shared<DataTypeTuple>(arguments);
}
void execute(Block & block, const ColumnNumbers & arguments, size_t result) override
{
Block tuple_block;
size_t num_constants = 0;
for (auto column_number : arguments)
{
const auto & elem = block.getByPosition(column_number);
if (elem.column->isConst())
++num_constants;
tuple_block.insert(elem);
}
if (num_constants == arguments.size())
{
/** Return ColumnConstTuple rather than ColumnTuple of nested const columns.
* (otherwise, ColumnTuple will not be understanded as constant in many places in code).
*/
TupleBackend tuple(arguments.size());
for (size_t i = 0, size = arguments.size(); i < size; ++i)
tuple_block.unsafeGetByPosition(i).column->get(0, tuple[i]);
block.getByPosition(result).column = std::make_shared<ColumnConstTuple>(
block.rowsInFirstColumn(), Tuple(tuple), block.getByPosition(result).type);
}
else
{
ColumnPtr res = std::make_shared<ColumnTuple>(tuple_block);
/** If tuple is mixed of constant and not constant columns,
* convert all to non-constant columns,
* because many places in code expect all non-constant columns in non-constant tuple.
*/
if (num_constants != 0)
if (auto converted = res->convertToFullColumnIfConst())
res = converted;
block.getByPosition(result).column = res;
}
}
};
/** Extract element of tuple by constant index. The operation is essentially free.
*/
class FunctionTupleElement : public IFunction
{
public:
static constexpr auto name = "tupleElement";
static FunctionPtr create(const Context & context) { return std::make_shared<FunctionTupleElement>(); }
String getName() const override
{
return name;
}
void getReturnTypeAndPrerequisites(const ColumnsWithTypeAndName & arguments,
DataTypePtr & out_return_type,
ExpressionActions::Actions & out_prerequisites) override
{
if (arguments.size() != 2)
throw Exception("Function " + getName() + " requires exactly two arguments: tuple and element index.",
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
const ColumnConstUInt8 * index_col = typeid_cast<const ColumnConstUInt8 *>(&*arguments[1].column);
if (!index_col)
throw Exception("Second argument to " + getName() + " must be a constant UInt8", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
size_t index = index_col->getData();
const DataTypeTuple * tuple = typeid_cast<const DataTypeTuple *>(&*arguments[0].type);
if (!tuple)
throw Exception("First argument for function " + getName() + " must be tuple.", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
if (index == 0)
throw Exception("Indices in tuples are 1-based.", ErrorCodes::ILLEGAL_INDEX);
const DataTypes & elems = tuple->getElements();
if (index > elems.size())
throw Exception("Index for tuple element is out of range.", ErrorCodes::ILLEGAL_INDEX);
out_return_type = elems[index - 1]->clone();
}
void execute(Block & block, const ColumnNumbers & arguments, size_t result) override
{
const ColumnTuple * tuple_col = typeid_cast<const ColumnTuple *>(block.getByPosition(arguments[0]).column.get());
const ColumnConstTuple * const_tuple_col = typeid_cast<const ColumnConstTuple *>(block.getByPosition(arguments[0]).column.get());
const ColumnConstUInt8 * index_col = typeid_cast<const ColumnConstUInt8 *>(block.getByPosition(arguments[1]).column.get());
if (!tuple_col && !const_tuple_col)
throw Exception("First argument for function " + getName() + " must be tuple.", ErrorCodes::ILLEGAL_COLUMN);
if (!index_col)
throw Exception("Second argument for function " + getName() + " must be UInt8 constant literal.", ErrorCodes::ILLEGAL_COLUMN);
size_t index = index_col->getData();
if (index == 0)
throw Exception("Indices in tuples is 1-based.", ErrorCodes::ILLEGAL_INDEX);
if (tuple_col)
{
const Block & tuple_block = tuple_col->getData();
if (index > tuple_block.columns())
throw Exception("Index for tuple element is out of range.", ErrorCodes::ILLEGAL_INDEX);
block.getByPosition(result).column = tuple_block.getByPosition(index - 1).column;
}
else
{
const TupleBackend & data = const_tuple_col->getData();
block.getByPosition(result).column = static_cast<const DataTypeTuple &>(*block.getByPosition(arguments[0]).type)
.getElements()[index - 1]->createConstColumn(block.rowsInFirstColumn(), data[index - 1]);
}
}
};
class FunctionIgnore : public IFunction
{
public:
static constexpr auto name = "ignore";
static FunctionPtr create(const Context & context) { return std::make_shared<FunctionIgnore>(); }
String getName() const override { return name; }
DataTypePtr getReturnType(const DataTypes & arguments) const override { return std::make_shared<DataTypeUInt8>(); }
/// Выполнить функцию над блоком.
void execute(Block & block, const ColumnNumbers & arguments, size_t result) override
{
block.getByPosition(result).column = std::make_shared<ColumnConstUInt8>(block.rowsInFirstColumn(), 0);
}
};
/** Функция indexHint принимает любое количество любых аргументов и всегда возвращает единицу.
*
* Эта функция имеет особый смысл (см. ExpressionAnalyzer, PKCondition):
* - расположенные внутри неё выражения не вычисляются;
* - но при анализе индекса (выбора диапазонов для чтения), эта функция воспринимается так же,
* как если бы вместо её применения было бы само выражение.
*
* Пример: WHERE something AND indexHint(CounterID = 34)
* - не читать и не вычислять CounterID = 34, но выбрать диапазоны, в которых выражение CounterID = 34 может быть истинным.
*
* Функция может использоваться в отладочных целях, а также для (скрытых от пользователя) преобразований запроса.
*/
class FunctionIndexHint : public IFunction
{
public:
static constexpr auto name = "indexHint";
static FunctionPtr create(const Context & context) { return std::make_shared<FunctionIndexHint>(); }
String getName() const override { return name; }
DataTypePtr getReturnType(const DataTypes & arguments) const override { return std::make_shared<DataTypeUInt8>(); }
/// Выполнить функцию над блоком.
void execute(Block & block, const ColumnNumbers & arguments, size_t result) override
{
block.getByPosition(result).column = std::make_shared<ColumnConstUInt8>(block.rowsInFirstColumn(), 1);
}
};
class FunctionIdentity : public IFunction
{
public:
static constexpr auto name = "identity";
static FunctionPtr create(const Context & context) { return std::make_shared<FunctionIdentity>(); }
/// Получить имя функции.
String getName() const override
{
return name;
}
/// Получить тип результата по типам аргументов. Если функция неприменима для данных аргументов - кинуть исключение.
DataTypePtr getReturnType(const DataTypes & arguments) const override
{
if (arguments.size() != 1)
throw Exception("Function " + getName() + " requires exactly one argument.",
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
return arguments.front()->clone();
}
/// Выполнить функцию над блоком.
void execute(Block & block, const ColumnNumbers & arguments, size_t result) override
{
block.getByPosition(result).column = block.getByPosition(arguments.front()).column;
}
};
class FunctionArrayJoin : public IFunction
{
public:
static constexpr auto name = "arrayJoin";
static FunctionPtr create(const Context & context) { return std::make_shared<FunctionArrayJoin>(); }
/// Получить имя функции.
String getName() const override
{
return name;
}
/// Получить тип результата по типам аргументов. Если функция неприменима для данных аргументов - кинуть исключение.
DataTypePtr getReturnType(const DataTypes & arguments) const override
{
if (arguments.size() != 1)
throw Exception("Function " + getName() + " requires exactly one argument.", ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
const DataTypeArray * arr = typeid_cast<const DataTypeArray *>(&*arguments[0]);
if (!arr)
throw Exception("Argument for function " + getName() + " must be Array.", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
return arr->getNestedType()->clone();
}
/// Выполнить функцию над блоком.
void execute(Block & block, const ColumnNumbers & arguments, size_t result) override
{
throw Exception("Function " + getName() + " must not be executed directly.", ErrorCodes::FUNCTION_IS_SPECIAL);
}
};
/** Создаёт массив, размножая столбец (первый аргумент) по количеству элементов в массиве (втором аргументе).
* Используется только в качестве prerequisites для функций высшего порядка.
*/
class FunctionReplicate : public IFunction
{
public:
static constexpr auto name = "replicate";
static FunctionPtr create(const Context & context) { return std::make_shared<FunctionReplicate>(); }
/// Получить имя функции.
String getName() const override
{
return name;
}
/// Получить типы результата по типам аргументов. Если функция неприменима для данных аргументов - кинуть исключение.
DataTypePtr getReturnType(const DataTypes & arguments) const override
{
if (arguments.size() != 2)
throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
+ toString(arguments.size()) + ", should be 2.",
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
const DataTypeArray * array_type = typeid_cast<const DataTypeArray *>(&*arguments[1]);
if (!array_type)
throw Exception("Second argument for function " + getName() + " must be array.", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
return std::make_shared<DataTypeArray>(arguments[0]->clone());
}
/// Выполнить функцию над блоком.
void execute(Block & block, const ColumnNumbers & arguments, size_t result) override
{
ColumnPtr first_column = block.getByPosition(arguments[0]).column;
ColumnArray * array_column = typeid_cast<ColumnArray *>(block.getByPosition(arguments[1]).column.get());
ColumnPtr temp_column;
if (!array_column)
{
ColumnConstArray * const_array_column = typeid_cast<ColumnConstArray *>(block.getByPosition(arguments[1]).column.get());
if (!const_array_column)
throw Exception("Unexpected column for replicate", ErrorCodes::ILLEGAL_COLUMN);
temp_column = const_array_column->convertToFullColumn();
array_column = typeid_cast<ColumnArray *>(&*temp_column);
}
block.getByPosition(result).column = std::make_shared<ColumnArray>(
first_column->replicate(array_column->getOffsets()),
array_column->getOffsetsColumn());
}
};
/** Returns a string with nice Unicode-art bar with resolution of 1/8 part of symbol.
*/
class FunctionBar : public IFunction
{
public:
static constexpr auto name = "bar";
static FunctionPtr create(const Context & context) { return std::make_shared<FunctionBar>(); }
String getName() const override
{
return name;
}
DataTypePtr getReturnType(const DataTypes & arguments) const override
{
if (arguments.size() != 3 && arguments.size() != 4)
throw Exception("Function " + getName() + " requires from 3 or 4 parameters: value, min_value, max_value, [max_width_of_bar = 80]. Passed "
+ toString(arguments.size()) + ".",
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
if (!arguments[0]->isNumeric() || !arguments[1]->isNumeric() || !arguments[2]->isNumeric()
|| (arguments.size() == 4 && !arguments[3]->isNumeric()))
throw Exception("All arguments for function " + getName() + " must be numeric.", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
return std::make_shared<DataTypeString>();
}
void execute(Block & block, const ColumnNumbers & arguments, size_t result) override
{
Int64 min = extractConstant<Int64>(block, arguments, 1, "Second"); /// Уровень значения, при котором полоска имеет нулевую длину.
Int64 max = extractConstant<Int64>(block, arguments, 2, "Third"); /// Уровень значения, при котором полоска имеет максимальную длину.
/// Максимальная ширина полоски в символах, по-умолчанию.
Float64 max_width = arguments.size() == 4
? extractConstant<Float64>(block, arguments, 3, "Fourth")
: 80;
if (max_width < 1)
throw Exception("Max_width argument must be >= 1.", ErrorCodes::ARGUMENT_OUT_OF_BOUND);
if (max_width > 1000)
throw Exception("Too large max_width.", ErrorCodes::ARGUMENT_OUT_OF_BOUND);
const auto & src = *block.getByPosition(arguments[0]).column;
if (src.isConst())
{
auto res_column = std::make_shared<ColumnConstString>(block.rowsInFirstColumn(), "");
block.getByPosition(result).column = res_column;
if ( executeConstNumber<UInt8> (src, *res_column, min, max, max_width)
|| executeConstNumber<UInt16> (src, *res_column, min, max, max_width)
|| executeConstNumber<UInt32> (src, *res_column, min, max, max_width)
|| executeConstNumber<UInt64> (src, *res_column, min, max, max_width)
|| executeConstNumber<Int8> (src, *res_column, min, max, max_width)
|| executeConstNumber<Int16> (src, *res_column, min, max, max_width)
|| executeConstNumber<Int32> (src, *res_column, min, max, max_width)
|| executeConstNumber<Int64> (src, *res_column, min, max, max_width)
|| executeConstNumber<Float32> (src, *res_column, min, max, max_width)
|| executeConstNumber<Float64> (src, *res_column, min, max, max_width))
{
}
else
throw Exception("Illegal column " + block.getByPosition(arguments[0]).column->getName()
+ " of argument of function " + getName(),
ErrorCodes::ILLEGAL_COLUMN);
}
else
{
auto res_column = std::make_shared<ColumnString>();
block.getByPosition(result).column = res_column;
if ( executeNumber<UInt8> (src, *res_column, min, max, max_width)
|| executeNumber<UInt16> (src, *res_column, min, max, max_width)
|| executeNumber<UInt32> (src, *res_column, min, max, max_width)
|| executeNumber<UInt64> (src, *res_column, min, max, max_width)
|| executeNumber<Int8> (src, *res_column, min, max, max_width)
|| executeNumber<Int16> (src, *res_column, min, max, max_width)
|| executeNumber<Int32> (src, *res_column, min, max, max_width)
|| executeNumber<Int64> (src, *res_column, min, max, max_width)
|| executeNumber<Float32> (src, *res_column, min, max, max_width)
|| executeNumber<Float64> (src, *res_column, min, max, max_width))
{
}
else
throw Exception("Illegal column " + block.getByPosition(arguments[0]).column->getName()
+ " of argument of function " + getName(),
ErrorCodes::ILLEGAL_COLUMN);
}
}
private:
template <typename T>
T extractConstant(Block & block, const ColumnNumbers & arguments, size_t argument_pos, const char * which_argument) const
{
const auto & column = *block.getByPosition(arguments[argument_pos]).column;
if (!column.isConst())
throw Exception(which_argument + String(" argument for function ") + getName() + " must be constant.", ErrorCodes::ILLEGAL_COLUMN);
return apply_visitor(FieldVisitorConvertToNumber<T>(), column[0]);
}
template <typename T>
static void fill(const PaddedPODArray<T> & src, ColumnString::Chars_t & dst_chars, ColumnString::Offsets_t & dst_offsets,
Int64 min, Int64 max, Float64 max_width)
{
size_t size = src.size();
size_t current_offset = 0;
dst_offsets.resize(size);
dst_chars.reserve(size * (UnicodeBar::getWidthInBytes(max_width) + 1)); /// строки 0-terminated.
for (size_t i = 0; i < size; ++i)
{
Float64 width = UnicodeBar::getWidth(src[i], min, max, max_width);
size_t next_size = current_offset + UnicodeBar::getWidthInBytes(width) + 1;
dst_chars.resize(next_size);
UnicodeBar::render(width, reinterpret_cast<char *>(&dst_chars[current_offset]));
current_offset = next_size;
dst_offsets[i] = current_offset;
}
}
template <typename T>
static void fill(T src, String & dst_chars,
Int64 min, Int64 max, Float64 max_width)
{
Float64 width = UnicodeBar::getWidth(src, min, max, max_width);
dst_chars.resize(UnicodeBar::getWidthInBytes(width));
UnicodeBar::render(width, &dst_chars[0]);
}
template <typename T>
static bool executeNumber(const IColumn & src, ColumnString & dst, Int64 min, Int64 max, Float64 max_width)
{
if (const ColumnVector<T> * col = typeid_cast<const ColumnVector<T> *>(&src))
{
fill(col->getData(), dst.getChars(), dst.getOffsets(), min, max, max_width);
return true;
}
else
return false;
}
template <typename T>
static bool executeConstNumber(const IColumn & src, ColumnConstString & dst, Int64 min, Int64 max, Float64 max_width)
{
if (const ColumnConst<T> * col = typeid_cast<const ColumnConst<T> *>(&src))
{
fill(col->getData(), dst.getData(), min, max, max_width);
return true;
}
else
return false;
}
};
template <typename Impl>
class FunctionNumericPredicate : public IFunction
{
public:
static constexpr auto name = Impl::name;
static FunctionPtr create(const Context &) { return std::make_shared<FunctionNumericPredicate>(); }
String getName() const override { return name; }
DataTypePtr getReturnType(const DataTypes & arguments) const override
{
const auto args_size = arguments.size();
if (args_size != 1)
throw Exception{
"Number of arguments for function " + getName() + " doesn't match: passed " +
toString(args_size) + ", should be 1",
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH
};
const auto arg = arguments.front().get();
if (!typeid_cast<const DataTypeUInt8 *>(arg) &&
!typeid_cast<const DataTypeUInt16 *>(arg) &&
!typeid_cast<const DataTypeUInt32 *>(arg) &&
!typeid_cast<const DataTypeUInt64 *>(arg) &&
!typeid_cast<const DataTypeInt8 *>(arg) &&
!typeid_cast<const DataTypeInt16 *>(arg) &&
!typeid_cast<const DataTypeInt32 *>(arg) &&
!typeid_cast<const DataTypeInt64 *>(arg) &&
!typeid_cast<const DataTypeFloat32 *>(arg) &&
!typeid_cast<const DataTypeFloat64 *>(arg))
throw Exception{
"Argument for function " + getName() + " must be numeric",
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT
};
return std::make_shared<DataTypeUInt8>();
}
void execute(Block & block, const ColumnNumbers & arguments, const size_t result) override
{
const auto in = block.getByPosition(arguments.front()).column.get();
if (!execute<UInt8>(block, in, result) &&
!execute<UInt16>(block, in, result) &&
!execute<UInt32>(block, in, result) &&
!execute<UInt64>(block, in, result) &&
!execute<Int8>(block, in, result) &&
!execute<Int16>(block, in, result) &&
!execute<Int32>(block, in, result) &&
!execute<Int64>(block, in, result) &&
!execute<Float32>(block, in, result) &&
!execute<Float64>(block, in, result))
throw Exception{
"Illegal column " + in->getName() + " of first argument of function " + getName(),
ErrorCodes::ILLEGAL_COLUMN
};
}
template <typename T>
bool execute(Block & block, const IColumn * in_untyped, const size_t result)
{
if (const auto in = typeid_cast<const ColumnVector<T> *>(in_untyped))
{
const auto size = in->size();
const auto out = std::make_shared<ColumnUInt8>(size);
block.getByPosition(result).column = out;
const auto & in_data = in->getData();
auto & out_data = out->getData();
for (const auto i : ext::range(0, size))
out_data[i] = Impl::execute(in_data[i]);
return true;
}
else if (const auto in = typeid_cast<const ColumnConst<T> *>(in_untyped))
{
block.getByPosition(result).column = std::make_shared<ColumnConstUInt8>(
in->size(),
Impl::execute(in->getData()));
return true;
}
return false;
}
};
struct IsFiniteImpl
{
static constexpr auto name = "isFinite";
template <typename T> static bool execute(const T t) { return std::isfinite(t); }
};
struct IsInfiniteImpl
{
static constexpr auto name = "isInfinite";
template <typename T> static bool execute(const T t) { return std::isinf(t); }
};
struct IsNaNImpl
{
static constexpr auto name = "isNaN";
template <typename T> static bool execute(const T t) { return std::isnan(t); }
};
using FunctionIsFinite = FunctionNumericPredicate<IsFiniteImpl>;
using FunctionIsInfinite = FunctionNumericPredicate<IsInfiniteImpl>;
using FunctionIsNaN = FunctionNumericPredicate<IsNaNImpl>;
/** Returns server version (constant).
*/
class FunctionVersion : public IFunction
{
public:
static constexpr auto name = "version";
static FunctionPtr create(const Context & context) { return std::make_shared<FunctionVersion>(); }
String getName() const override { return name; }
DataTypePtr getReturnType(const DataTypes & arguments) const override
{
if (!arguments.empty())
throw Exception("Function " + getName() + " must be called without arguments", ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
return std::make_shared<DataTypeString>();
}
void execute(Block & block, const ColumnNumbers & arguments, size_t result) override
{
static const std::string version = getVersion();
block.getByPosition(result).column = std::make_shared<ColumnConstString>(block.rowsInFirstColumn(), version);
}
private:
std::string getVersion() const
{
std::ostringstream os;
os << DBMS_VERSION_MAJOR << "." << DBMS_VERSION_MINOR << "." << ClickHouseRevision::get();
return os.str();
}
};
/** Returns server uptime in seconds.
*/
class FunctionUptime : public IFunction
{
public:
static constexpr auto name = "uptime";
static FunctionPtr create(const Context & context) { return std::make_shared<FunctionUptime>(context.getUptimeSeconds()); }
FunctionUptime(time_t uptime_) : uptime(uptime_) {}
String getName() const override { return name; }
DataTypePtr getReturnType(const DataTypes & arguments) const override
{
if (!arguments.empty())
throw Exception("Function " + getName() + " must be called without arguments", ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
return std::make_shared<DataTypeUInt32>();
}
void execute(Block & block, const ColumnNumbers & arguments, size_t result) override
{
block.getByPosition(result).column = std::make_shared<ColumnConstUInt32>(block.rowsInFirstColumn(), uptime);
}
private:
time_t uptime;
};
/** Quite unusual function.
* Takes state of aggregate function (example runningAccumulate(uniqState(UserID))),
* and for each row of block, return result of aggregate function on merge of states of all previous rows and current row.
*
* So, result of function depends on partition of data to blocks and on order of data in block.
*/
class FunctionRunningAccumulate : public IFunction
{
public:
static constexpr auto name = "runningAccumulate";
static FunctionPtr create(const Context & context) { return std::make_shared<FunctionRunningAccumulate>(); }
String getName() const override { return name; }
DataTypePtr getReturnType(const DataTypes & arguments) const override
{
if (arguments.size() != 1)
throw Exception("Function " + getName() + " requires exactly one argument.", ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
const DataTypeAggregateFunction * type = typeid_cast<const DataTypeAggregateFunction *>(&*arguments[0]);
if (!type)
throw Exception("Argument for function " + getName() + " must have type AggregateFunction - state of aggregate function.",
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
return type->getReturnType()->clone();
}
void execute(Block & block, const ColumnNumbers & arguments, size_t result) override
{
const ColumnAggregateFunction * column_with_states = typeid_cast<const ColumnAggregateFunction *>(&*block.getByPosition(arguments.at(0)).column);
if (!column_with_states)
throw Exception(
"Illegal column " + block.getByPosition(arguments.at(0)).column->getName() + " of first argument of function " + getName(),
ErrorCodes::ILLEGAL_COLUMN);
AggregateFunctionPtr aggregate_function_ptr = column_with_states->getAggregateFunction();
const IAggregateFunction & agg_func = *aggregate_function_ptr;
auto deleter = [&agg_func] (char * ptr) { agg_func.destroy(ptr); free(ptr); };
std::unique_ptr<char, decltype(deleter)> place { reinterpret_cast<char *>(malloc(agg_func.sizeOfData())), deleter };
agg_func.create(place.get()); /// Немного не exception-safe. Если здесь выкинется исключение, то зря вызовется destroy.
ColumnPtr result_column_ptr = agg_func.getReturnType()->createColumn();
block.getByPosition(result).column = result_column_ptr;
IColumn & result_column = *result_column_ptr;
result_column.reserve(column_with_states->size());
auto arena = (agg_func.allocatesMemoryInArena()) ?
arenas_pool.get(0, []{ return new Arena(); }) :
nullptr;
const auto & states = column_with_states->getData();
for (const auto & state_to_add : states)
{
/// Will pass empty arena if agg_func does not allocate memory in arena
agg_func.merge(place.get(), state_to_add, arena.get());
agg_func.insertResultInto(place.get(), result_column);
}
}
private:
ObjectPool<Arena, int> arenas_pool; /// Used only for complex functions
};
/** Calculate difference of consecutive values in block.
* So, result of function depends on partition of data to blocks and on order of data in block.
*/
class FunctionRunningDifference : public IFunction
{
private:
/// It is possible to track value from previous block, to calculate continuously across all blocks. Not implemented.
template <typename Src, typename Dst>
static void process(const PaddedPODArray<Src> & src, PaddedPODArray<Dst> & dst)
{
size_t size = src.size();
dst.resize(size);
if (size == 0)
return;
/// It is possible to SIMD optimize this loop. By no need for that in practice.
dst[0] = 0;
Src prev = src[0];
for (size_t i = 1; i < size; ++i)
{
auto cur = src[i];
dst[i] = static_cast<Dst>(cur) - prev;
prev = cur;
}
}
/// Result type is same as result of subtraction of argument types.
template <typename SrcFieldType>
using DstFieldType = typename NumberTraits::ResultOfSubtraction<SrcFieldType, SrcFieldType>::Type;
/// Call polymorphic lambda with tag argument of concrete field type of src_type.
template <typename F>
void dispatchForSourceType(const IDataType & src_type, F && f) const
{
if (auto src_type_concrete = typeid_cast<const DataTypeUInt8 *>(&src_type)) f(UInt8());
else if (auto src_type_concrete = typeid_cast<const DataTypeUInt16 *>(&src_type)) f(UInt16());
else if (auto src_type_concrete = typeid_cast<const DataTypeUInt32 *>(&src_type)) f(UInt32());
else if (auto src_type_concrete = typeid_cast<const DataTypeUInt64 *>(&src_type)) f(UInt64());
else if (auto src_type_concrete = typeid_cast<const DataTypeInt8 *>(&src_type)) f(Int8());
else if (auto src_type_concrete = typeid_cast<const DataTypeInt16 *>(&src_type)) f(Int16());
else if (auto src_type_concrete = typeid_cast<const DataTypeInt32 *>(&src_type)) f(Int32());
else if (auto src_type_concrete = typeid_cast<const DataTypeInt64 *>(&src_type)) f(Int64());
else if (auto src_type_concrete = typeid_cast<const DataTypeFloat32 *>(&src_type)) f(Float32());
else if (auto src_type_concrete = typeid_cast<const DataTypeFloat64 *>(&src_type)) f(Float64());
else if (auto src_type_concrete = typeid_cast<const DataTypeDate *>(&src_type)) f(DataTypeDate::FieldType());
else if (auto src_type_concrete = typeid_cast<const DataTypeDateTime *>(&src_type)) f(DataTypeDateTime::FieldType());
else
throw Exception("Argument for function " + getName() + " must have numeric type.",
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
}
public:
static constexpr auto name = "runningDifference";
static FunctionPtr create(const Context & context) { return std::make_shared<FunctionRunningDifference>(); }
String getName() const override { return name; }
DataTypePtr getReturnType(const DataTypes & arguments) const override
{
if (arguments.size() != 1)
throw Exception("Function " + getName() + " requires exactly one argument.", ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
DataTypePtr res;
dispatchForSourceType(*arguments[0], [&] (auto field_type_tag)
{
res = std::make_shared<typename DataTypeFromFieldType<DstFieldType<decltype(field_type_tag)>>::Type>();
});
return res;
}
void execute(Block & block, const ColumnNumbers & arguments, size_t result) override
{
auto & src = block.getByPosition(arguments.at(0));
auto & res = block.getByPosition(result);
/// When column is constant, its difference is zero.
if (src.column->isConst())
{
res.column = res.type->createConstColumn(block.rowsInFirstColumn(), res.type->getDefault());
return;
}
res.column = res.type->createColumn();
dispatchForSourceType(*src.type, [&] (auto field_type_tag)
{
using SrcFieldType = decltype(field_type_tag);
process(
static_cast<const ColumnVector<SrcFieldType> &>(*src.column).getData(),
static_cast<ColumnVector<DstFieldType<SrcFieldType>> &>(*res.column).getData());
});
}
};
/** Takes state of aggregate function. Returns result of aggregation (finalized state).
*/
class FunctionFinalizeAggregation : public IFunction
{
public:
static constexpr auto name = "finalizeAggregation";
static FunctionPtr create(const Context & context) { return std::make_shared<FunctionFinalizeAggregation>(); }
String getName() const override { return name; }
DataTypePtr getReturnType(const DataTypes & arguments) const override
{
if (arguments.size() != 1)
throw Exception("Function " + getName() + " requires exactly one argument.", ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
const DataTypeAggregateFunction * type = typeid_cast<const DataTypeAggregateFunction *>(&*arguments[0]);
if (!type)
throw Exception("Argument for function " + getName() + " must have type AggregateFunction - state of aggregate function.",
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
return type->getReturnType()->clone();
}
void execute(Block & block, const ColumnNumbers & arguments, size_t result) override
{
ColumnAggregateFunction * column_with_states = typeid_cast<ColumnAggregateFunction *>(&*block.getByPosition(arguments.at(0)).column);
if (!column_with_states)
throw Exception(
"Illegal column " + block.getByPosition(arguments.at(0)).column->getName() + " of first argument of function " + getName(),
ErrorCodes::ILLEGAL_COLUMN);
block.getByPosition(result).column = column_with_states->convertToValues();
}
};
}