ClickHouse/dbms/src/Functions/FunctionsMiscellaneous.h
2017-07-25 01:44:13 +03:00

77 lines
1.7 KiB
C++

#pragma once
#include <Columns/ColumnAggregateFunction.h>
#include <Columns/ColumnConst.h>
#include <Columns/ColumnString.h>
#include <Columns/ColumnTuple.h>
#include <Functions/IFunction.h>
#include <Functions/FunctionHelpers.h>
#include <DataTypes/NumberTraits.h>
#include <Interpreters/ExpressionActions.h>
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
{
return true;
}
size_t getNumberOfArguments() const override
{
return 0;
}
bool isInjective(const Block &) override
{
return true;
}
bool useDefaultImplementationForNulls() const override { return false; }
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override;
void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result) override;
};
/** Creates an array, multiplying the column (the first argument) by the number of elements in the array (the second argument).
* Used only as prerequisites for higher-order functions.
*/
class FunctionReplicate : public IFunction
{
public:
static constexpr auto name = "replicate";
static FunctionPtr create(const Context & context);
String getName() const override
{
return name;
}
size_t getNumberOfArguments() const override
{
return 2;
}
bool useDefaultImplementationForNulls() const override { return false; }
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override;
void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result) override;
};
}