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