mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-10-01 06:00:49 +00:00
52 lines
1.3 KiB
C++
52 lines
1.3 KiB
C++
|
#include <Functions/IFunction.h>
|
||
|
#include <Functions/FunctionFactory.h>
|
||
|
#include <DataTypes/DataTypesNumber.h>
|
||
|
|
||
|
|
||
|
namespace DB
|
||
|
{
|
||
|
|
||
|
/** ignoreExceptNull(...) is a function that takes any arguments, and always returns 0 except Null.
|
||
|
*/
|
||
|
class FunctionIgnoreExceptNull : public IFunction
|
||
|
{
|
||
|
public:
|
||
|
static constexpr auto name = "ignoreExceptNull";
|
||
|
static FunctionPtr create(const Context &)
|
||
|
{
|
||
|
return std::make_shared<FunctionIgnoreExceptNull>();
|
||
|
}
|
||
|
|
||
|
bool isVariadic() const override
|
||
|
{
|
||
|
return true;
|
||
|
}
|
||
|
size_t getNumberOfArguments() const override
|
||
|
{
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
String getName() const override
|
||
|
{
|
||
|
return name;
|
||
|
}
|
||
|
|
||
|
DataTypePtr getReturnTypeImpl(const DataTypes & /*arguments*/) const override
|
||
|
{
|
||
|
return std::make_shared<DataTypeUInt8>();
|
||
|
}
|
||
|
|
||
|
void executeImpl(Block & block, const ColumnNumbers &, size_t result, size_t input_rows_count) override
|
||
|
{
|
||
|
block.getByPosition(result).column = DataTypeUInt8().createColumnConst(input_rows_count, UInt64(0));
|
||
|
}
|
||
|
};
|
||
|
|
||
|
|
||
|
void registerFunctionIgnoreExceptNull(FunctionFactory & factory)
|
||
|
{
|
||
|
factory.registerFunction<FunctionIgnoreExceptNull>();
|
||
|
}
|
||
|
|
||
|
}
|