ClickHouse/dbms/include/DB/Functions/FunctionsMiscellaneous.h

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#pragma once
#include <DB/Columns/ColumnAggregateFunction.h>
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#include <DB/Columns/ColumnConst.h>
#include <DB/Columns/ColumnString.h>
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#include <DB/Columns/ColumnTuple.h>
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#include <DB/Functions/IFunction.h>
#include <DB/Functions/NumberTraits.h>
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#include <DB/Interpreters/ExpressionActions.h>
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namespace DB
{
class FunctionTuple : public IFunction
{
public:
static constexpr auto name = "tuple";
static FunctionPtr create(const Context & context);
String getName() const override
{
return name;
}
bool isVariadic() const override
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{
return true;
}
size_t getNumberOfArguments() const override
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{
return 0;
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}
bool isInjective(const Block &) override
{
return true;
}
bool hasSpecialSupportForNulls() const override
{
return true;
}
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override;
void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result) override;
};
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/** 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
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{
public:
static constexpr auto name = "replicate";
static FunctionPtr create(const Context & context);
String getName() const override
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{
return name;
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}
size_t getNumberOfArguments() const override
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{
return 2;
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}
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override;
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void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result) override;
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};
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}