2020-10-10 18:37:02 +00:00
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#pragma once
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2018-09-09 23:36:06 +00:00
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#include <DataTypes/DataTypeString.h>
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2018-09-09 23:47:56 +00:00
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#include <DataTypes/DataTypesNumber.h>
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2019-12-09 13:12:54 +00:00
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#include <Functions/IFunctionImpl.h>
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2018-09-09 23:36:06 +00:00
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#include <Functions/FunctionHelpers.h>
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#include <Columns/ColumnVector.h>
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#include <Columns/ColumnString.h>
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#include <Columns/ColumnFixedString.h>
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#include <Columns/ColumnArray.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, typename ResultType>
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class FunctionStringOrArrayToT : 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<FunctionStringOrArrayToT>();
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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 DataTypes & arguments) const override
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{
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if (!isStringOrFixedString(arguments[0])
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&& !isArray(arguments[0]))
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throw Exception("Illegal type " + arguments[0]->getName() + " of argument of function " + getName(), ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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return std::make_shared<DataTypeNumber<ResultType>>();
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}
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bool useDefaultImplementationForConstants() const override { return true; }
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2020-10-17 16:48:53 +00:00
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ColumnPtr executeImpl(ColumnsWithTypeAndName & arguments, const DataTypePtr & result_type, size_t /*input_rows_count*/) const override
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2018-09-09 23:36:06 +00:00
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{
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2020-10-17 16:48:53 +00:00
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const ColumnPtr column = arguments[0].column;
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2018-09-09 23:36:06 +00:00
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if (const ColumnString * col = checkAndGetColumn<ColumnString>(column.get()))
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{
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auto col_res = ColumnVector<ResultType>::create();
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typename ColumnVector<ResultType>::Container & vec_res = col_res->getData();
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vec_res.resize(col->size());
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Impl::vector(col->getChars(), col->getOffsets(), vec_res);
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2020-10-17 16:48:53 +00:00
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return col_res;
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2018-09-09 23:36:06 +00:00
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}
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2019-01-04 12:10:00 +00:00
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else if (const ColumnFixedString * col_fixed = checkAndGetColumn<ColumnFixedString>(column.get()))
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2018-09-09 23:36:06 +00:00
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{
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if (Impl::is_fixed_to_constant)
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{
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ResultType res = 0;
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2020-03-23 02:12:31 +00:00
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Impl::vectorFixedToConstant(col_fixed->getChars(), col_fixed->getN(), res);
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2018-09-09 23:36:06 +00:00
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2020-10-17 16:48:53 +00:00
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return result_type->createColumnConst(col_fixed->size(), toField(res));
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2018-09-09 23:36:06 +00:00
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}
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else
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{
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auto col_res = ColumnVector<ResultType>::create();
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typename ColumnVector<ResultType>::Container & vec_res = col_res->getData();
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2019-01-04 12:10:00 +00:00
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vec_res.resize(col_fixed->size());
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2020-03-23 02:12:31 +00:00
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Impl::vectorFixedToVector(col_fixed->getChars(), col_fixed->getN(), vec_res);
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2018-09-09 23:36:06 +00:00
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2020-10-17 16:48:53 +00:00
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return col_res;
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2018-09-09 23:36:06 +00:00
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}
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}
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2019-01-04 12:10:00 +00:00
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else if (const ColumnArray * col_arr = checkAndGetColumn<ColumnArray>(column.get()))
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2018-09-09 23:36:06 +00:00
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{
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auto col_res = ColumnVector<ResultType>::create();
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typename ColumnVector<ResultType>::Container & vec_res = col_res->getData();
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2019-01-04 12:10:00 +00:00
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vec_res.resize(col_arr->size());
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Impl::array(col_arr->getOffsets(), vec_res);
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2018-09-09 23:36:06 +00:00
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2020-10-17 16:48:53 +00:00
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return col_res;
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2018-09-09 23:36:06 +00:00
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}
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else
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2020-10-17 16:48:53 +00:00
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throw Exception("Illegal column " + arguments[0].column->getName() + " of argument of function " + getName(),
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2018-09-09 23:36:06 +00:00
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ErrorCodes::ILLEGAL_COLUMN);
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}
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};
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}
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