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78 lines
2.3 KiB
C++
78 lines
2.3 KiB
C++
#pragma once
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#include <DataTypes/DataTypeString.h>
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#include <Columns/ColumnString.h>
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#include <Columns/ColumnFixedString.h>
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#include <Functions/FunctionHelpers.h>
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#include <Functions/IFunctionImpl.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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}
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template <typename Impl, typename Name, bool is_injective = false>
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class FunctionStringToString : public IFunction
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{
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public:
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static constexpr auto name = Name::name;
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static FunctionPtr create(const Context &)
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{
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return std::make_shared<FunctionStringToString>();
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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 isInjective(const ColumnsWithTypeAndName &) const override
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{
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return is_injective;
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}
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DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
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{
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if (!isStringOrFixedString(arguments[0]))
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throw Exception(
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"Illegal type " + arguments[0]->getName() + " of argument of function " + getName(), ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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return arguments[0];
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}
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bool useDefaultImplementationForConstants() const override { return true; }
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void executeImpl(ColumnsWithTypeAndName & columns, const ColumnNumbers & arguments, size_t result, size_t /*input_rows_count*/) const override
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{
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const ColumnPtr column = columns[arguments[0]].column;
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if (const ColumnString * col = checkAndGetColumn<ColumnString>(column.get()))
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{
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auto col_res = ColumnString::create();
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Impl::vector(col->getChars(), col->getOffsets(), col_res->getChars(), col_res->getOffsets());
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columns[result].column = std::move(col_res);
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}
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else if (const ColumnFixedString * col_fixed = checkAndGetColumn<ColumnFixedString>(column.get()))
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{
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auto col_res = ColumnFixedString::create(col_fixed->getN());
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Impl::vectorFixed(col_fixed->getChars(), col_fixed->getN(), col_res->getChars());
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columns[result].column = std::move(col_res);
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}
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else
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throw Exception(
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"Illegal column " + columns[arguments[0]].column->getName() + " of argument of function " + getName(),
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ErrorCodes::ILLEGAL_COLUMN);
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}
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};
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}
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