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https://github.com/ClickHouse/ClickHouse.git
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106 lines
2.9 KiB
C++
106 lines
2.9 KiB
C++
#include <base/demangle.h>
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#include <Columns/ColumnString.h>
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#include <DataTypes/DataTypeString.h>
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#include <Functions/IFunction.h>
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#include <Functions/FunctionFactory.h>
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#include <IO/WriteHelpers.h>
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#include <Access/Common/AccessFlags.h>
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#include <Interpreters/Context.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int ILLEGAL_COLUMN;
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extern const int ILLEGAL_TYPE_OF_ARGUMENT;
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extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
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}
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namespace
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{
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class FunctionDemangle : public IFunction
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{
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public:
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static constexpr auto name = "demangle";
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static FunctionPtr create(ContextPtr context)
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{
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context->checkAccess(AccessType::demangle);
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return std::make_shared<FunctionDemangle>();
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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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size_t getNumberOfArguments() const override
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{
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return 1;
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}
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bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override
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{
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return true;
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}
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DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override
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{
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if (arguments.size() != 1)
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throw Exception("Function " + getName() + " needs exactly one argument; passed "
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+ toString(arguments.size()) + ".", ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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const auto & type = arguments[0].type;
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if (!WhichDataType(type.get()).isString())
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throw Exception("The only argument for function " + getName() + " must be String. Found "
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+ type->getName() + " instead.", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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return std::make_shared<DataTypeString>();
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}
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bool useDefaultImplementationForConstants() const override
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{
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return true;
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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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const ColumnPtr & column = arguments[0].column;
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const ColumnString * column_concrete = checkAndGetColumn<ColumnString>(column.get());
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if (!column_concrete)
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throw Exception("Illegal column " + column->getName() + " of argument of function " + getName(), ErrorCodes::ILLEGAL_COLUMN);
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auto result_column = ColumnString::create();
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for (size_t i = 0; i < input_rows_count; ++i)
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{
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StringRef source = column_concrete->getDataAtWithTerminatingZero(i);
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auto demangled = tryDemangle(source.data);
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if (demangled)
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{
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result_column->insertDataWithTerminatingZero(demangled.get(), strlen(demangled.get()) + 1);
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}
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else
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{
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result_column->insertDataWithTerminatingZero(source.data, source.size);
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}
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}
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return result_column;
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}
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};
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}
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void registerFunctionDemangle(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionDemangle>();
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}
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}
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