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103 lines
3.5 KiB
C++
103 lines
3.5 KiB
C++
#include "config_functions.h"
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#if USE_H3
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# include <Functions/GatherUtils/GatherUtils.h>
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# include <Functions/GatherUtils/Sources.h>
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# include <DataTypes/DataTypeString.h>
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# include <DataTypes/DataTypesNumber.h>
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# include <Columns/ColumnString.h>
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# include <Functions/FunctionFactory.h>
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# include <Functions/IFunction.h>
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# include <Common/typeid_cast.h>
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# include <h3api.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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using namespace GatherUtils;
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class FunctionStringToH3 : public IFunction
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{
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public:
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static constexpr auto name = "stringToH3";
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static FunctionPtr create(const Context &) { return std::make_shared<FunctionStringToH3>(); }
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std::string getName() const override { return name; }
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size_t getNumberOfArguments() const override { return 1; }
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bool useDefaultImplementationForConstants() const override { return true; }
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DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
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{
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auto arg = arguments[0].get();
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if (!WhichDataType(arg).isStringOrFixedString())
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throw Exception(
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"Illegal type " + arg->getName() + " of argument " + std::to_string(1) + " of function " + getName() + ". Must be String or FixedString",
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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return std::make_shared<DataTypeUInt64>();
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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 auto col_hindex = block.getByPosition(arguments[0]).column.get();
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auto dst = ColumnVector<UInt64>::create();
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auto & dst_data = dst->getData();
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dst_data.resize(input_rows_count);
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if (auto * h3index = checkAndGetColumn<ColumnString>(col_hindex))
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execute<StringSource>(StringSource(*h3index), dst_data);
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else if (auto * h3index_fixed = checkAndGetColumn<ColumnFixedString>(col_hindex))
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execute<FixedStringSource>(FixedStringSource(*h3index_fixed), dst_data);
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else if (const ColumnConst * h3index_const = checkAndGetColumnConst<ColumnString>(col_hindex))
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execute<ConstSource<StringSource>>(ConstSource<StringSource>(*h3index_const), dst_data);
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else if (const ColumnConst * h3index_const_fixed = checkAndGetColumnConst<ColumnFixedString>(col_hindex))
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execute<ConstSource<FixedStringSource>>(ConstSource<FixedStringSource>(*h3index_const_fixed), dst_data);
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else
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throw Exception("Illegal column as argument of function " + getName(), ErrorCodes::ILLEGAL_COLUMN);
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block.getByPosition(result).column = std::move(dst);
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}
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private:
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template <typename H3IndexSource>
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static void execute(H3IndexSource h3index_source, PaddedPODArray<UInt64> & res_data)
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{
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size_t row_num = 0;
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while (!h3index_source.isEnd())
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{
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auto h3index = h3index_source.getWhole();
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// covert to std::string and get the c_str to have the delimiting \0 at the end.
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auto h3index_str = StringRef(h3index.data, h3index.size).toString();
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res_data[row_num] = stringToH3(h3index_str.c_str());
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if (res_data[row_num] == 0)
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{
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throw Exception("Invalid H3 index: " + h3index_str, ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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}
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h3index_source.next();
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++row_num;
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}
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}
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};
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void registerFunctionStringToH3(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionStringToH3>();
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}
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}
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#endif
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