ClickHouse/src/Functions/FunctionFQDN.cpp

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#include <Functions/IFunctionImpl.h>
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#include <Functions/FunctionFactory.h>
#include <DataTypes/DataTypeString.h>
#include <common/getFQDNOrHostName.h>
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#include <Core/Field.h>
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namespace DB
{
class FunctionFQDN : public IFunction
{
public:
static constexpr auto name = "FQDN";
static FunctionPtr create(const Context &)
{
return std::make_shared<FunctionFQDN>();
}
String getName() const override
{
return name;
}
bool isDeterministic() const override { return false; }
size_t getNumberOfArguments() const override
{
return 0;
}
DataTypePtr getReturnTypeImpl(const DataTypes & /*arguments*/) const override
{
return std::make_shared<DataTypeString>();
}
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ColumnPtr executeImpl(ColumnsWithTypeAndName &, const DataTypePtr & result_type, size_t input_rows_count) const override
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{
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return result_type->createColumnConst(
input_rows_count, getFQDNOrHostName())->convertToFullColumnIfConst();
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}
};
void registerFunctionFQDN(FunctionFactory & factory)
{
factory.registerFunction<FunctionFQDN>(FunctionFactory::CaseInsensitive);
factory.registerFunction<FunctionFQDN>("fullHostName");
}
}