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78 lines
2.2 KiB
C++
78 lines
2.2 KiB
C++
#include <Functions/FunctionFactory.h>
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#include <Functions/IFunction.h>
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#include <Core/Field.h>
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#include <DataTypes/DataTypeString.h>
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#include <Interpreters/Context.h>
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namespace DB
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{
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namespace
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{
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/** toTypeName(x) - get the type name
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* Returns name of IDataType instance (name of data type).
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*/
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class FunctionToTypeName : public IFunction
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{
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public:
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explicit FunctionToTypeName(bool print_pretty_type_names_) : print_pretty_type_names(print_pretty_type_names_)
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{
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}
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static constexpr auto name = "toTypeName";
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static FunctionPtr create(ContextPtr context)
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{
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return std::make_shared<FunctionToTypeName>(context->getSettingsRef().print_pretty_type_names);
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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 useDefaultImplementationForNulls() const override { return false; }
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bool useDefaultImplementationForNothing() const override { return false; }
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bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return false; }
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bool useDefaultImplementationForLowCardinalityColumns() const override { return false; }
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size_t getNumberOfArguments() const override
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{
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return 1;
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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 & arguments, const DataTypePtr &, size_t input_rows_count) const override
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{
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return DataTypeString().createColumnConst(input_rows_count, print_pretty_type_names ? arguments[0].type->getPrettyName() : arguments[0].type->getName());
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}
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ColumnPtr getConstantResultForNonConstArguments(const ColumnsWithTypeAndName & arguments, const DataTypePtr &) const override
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{
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return DataTypeString().createColumnConst(1, print_pretty_type_names ? arguments[0].type->getPrettyName() : arguments[0].type->getName());
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}
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ColumnNumbers getArgumentsThatDontImplyNullableReturnType(size_t /*number_of_arguments*/) const override { return {0}; }
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private:
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bool print_pretty_type_names;
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};
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}
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REGISTER_FUNCTION(ToTypeName)
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{
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factory.registerFunction<FunctionToTypeName>();
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}
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}
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