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https://github.com/ClickHouse/ClickHouse.git
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98 lines
3.0 KiB
C++
98 lines
3.0 KiB
C++
#if defined(__ELF__) && !defined(__FreeBSD__)
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#include <Common/SymbolIndex.h>
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#include <Columns/ColumnString.h>
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#include <Columns/ColumnsNumber.h>
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#include <DataTypes/DataTypeString.h>
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#include <Functions/IFunctionImpl.h>
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#include <Functions/FunctionHelpers.h>
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#include <Functions/FunctionFactory.h>
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#include <Access/AccessFlags.h>
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#include <Interpreters/Context.h>
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#include <IO/WriteHelpers.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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class FunctionAddressToSymbol : public IFunction
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{
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public:
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static constexpr auto name = "addressToSymbol";
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static FunctionPtr create(const Context & context)
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{
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context.checkAccess(AccessType::addressToSymbol);
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return std::make_shared<FunctionAddressToSymbol>();
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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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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()).isUInt64())
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throw Exception("The only argument for function " + getName() + " must be UInt64. 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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void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t input_rows_count) override
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{
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const SymbolIndex & symbol_index = SymbolIndex::instance();
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const ColumnPtr & column = block.getByPosition(arguments[0]).column;
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const ColumnUInt64 * column_concrete = checkAndGetColumn<ColumnUInt64>(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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const typename ColumnVector<UInt64>::Container & data = column_concrete->getData();
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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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if (const auto * symbol = symbol_index.findSymbol(reinterpret_cast<const void *>(data[i])))
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result_column->insertDataWithTerminatingZero(symbol->name, strlen(symbol->name) + 1);
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else
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result_column->insertDefault();
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}
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block.getByPosition(result).column = std::move(result_column);
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}
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};
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void registerFunctionAddressToSymbol(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionAddressToSymbol>();
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}
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}
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#endif
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