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4abc36774e
In cases where the implementation simply repeates the implementation inherited from the base class, it can be omitted.
135 lines
4.3 KiB
C++
135 lines
4.3 KiB
C++
#include <DataTypes/DataTypesNumber.h>
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#include <Functions/FunctionFactory.h>
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#include <Functions/FunctionHelpers.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 NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
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extern const int ILLEGAL_COLUMN;
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extern const int ILLEGAL_TYPE_OF_ARGUMENT;
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}
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namespace
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{
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class ExecutableFunctionGetServerPort : public IExecutableFunction
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{
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public:
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explicit ExecutableFunctionGetServerPort(UInt16 port_) : port(port_) {}
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String getName() const override { return "getServerPort"; }
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bool useDefaultImplementationForNulls() const override { return false; }
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ColumnPtr executeImpl(const ColumnsWithTypeAndName &, const DataTypePtr &, size_t input_rows_count) const override
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{
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return DataTypeNumber<UInt16>().createColumnConst(input_rows_count, port);
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}
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private:
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UInt16 port;
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};
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class FunctionBaseGetServerPort : public IFunctionBase
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{
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public:
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explicit FunctionBaseGetServerPort(bool is_distributed_, UInt16 port_, DataTypes argument_types_, DataTypePtr return_type_)
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: is_distributed(is_distributed_), port(port_), argument_types(std::move(argument_types_)), return_type(std::move(return_type_))
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{
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}
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String getName() const override { return "getServerPort"; }
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const DataTypes & getArgumentTypes() const override
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{
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return argument_types;
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}
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const DataTypePtr & getResultType() const override
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{
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return return_type;
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}
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bool isDeterministic() const override { return false; }
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bool isSuitableForConstantFolding() const override { return !is_distributed; }
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bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return false; }
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ExecutableFunctionPtr prepare(const ColumnsWithTypeAndName &) const override
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{
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return std::make_unique<ExecutableFunctionGetServerPort>(port);
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}
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private:
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bool is_distributed;
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UInt16 port;
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DataTypes argument_types;
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DataTypePtr return_type;
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};
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class GetServerPortOverloadResolver : public IFunctionOverloadResolver, WithContext
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{
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public:
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static constexpr auto name = "getServerPort";
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String getName() const override { return name; }
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static FunctionOverloadResolverPtr create(ContextPtr context_)
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{
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return std::make_unique<GetServerPortOverloadResolver>(context_);
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}
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explicit GetServerPortOverloadResolver(ContextPtr context_) : WithContext(context_) {}
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size_t getNumberOfArguments() const override { return 1; }
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ColumnNumbers getArgumentsThatAreAlwaysConstant() const override { return {0}; }
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bool isDeterministic() const override { return false; }
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DataTypePtr getReturnTypeImpl(const DataTypes & data_types) const override
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{
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size_t number_of_arguments = data_types.size();
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if (number_of_arguments != 1)
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throw Exception(
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH,
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"Number of arguments for function {} doesn't match: passed {}, should be 1",
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getName(),
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number_of_arguments);
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return std::make_shared<DataTypeNumber<UInt16>>();
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}
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FunctionBasePtr buildImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr & return_type) const override
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{
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if (!isString(arguments[0].type))
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throw Exception(
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
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"The argument of function {} should be a constant string with the name of a setting",
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getName());
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const auto * column = arguments[0].column.get();
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if (!column || !checkAndGetColumnConstStringOrFixedString(column))
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throw Exception(
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ErrorCodes::ILLEGAL_COLUMN,
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"The argument of function {} should be a constant string with the name of a setting",
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getName());
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String port_name{column->getDataAt(0)};
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auto port = getContext()->getServerPort(port_name);
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DataTypes argument_types;
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argument_types.emplace_back(arguments.back().type);
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return std::make_unique<FunctionBaseGetServerPort>(getContext()->isDistributed(), port, argument_types, return_type);
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}
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};
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}
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REGISTER_FUNCTION(GetServerPort)
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{
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factory.registerFunction<GetServerPortOverloadResolver>();
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}
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}
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