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87 lines
2.6 KiB
C++
87 lines
2.6 KiB
C++
#include "config_functions.h"
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#if USE_H3
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# include <Columns/ColumnString.h>
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# include <DataTypes/DataTypeString.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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# define H3_INDEX_STRING_LENGTH 17 // includes \0 terminator
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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_TYPE_OF_ARGUMENT;
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}
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class FunctionH3ToString : public IFunction
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{
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public:
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static constexpr auto name = "h3ToString";
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static FunctionPtr create(const Context &) { return std::make_shared<FunctionH3ToString>(); }
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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).isUInt64())
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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 UInt64",
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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return std::make_shared<DataTypeString>();
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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 col_res = ColumnString::create();
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auto & vec_res = col_res->getChars();
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auto & vec_offsets = col_res->getOffsets();
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vec_offsets.resize(input_rows_count);
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vec_res.resize_fill(input_rows_count * H3_INDEX_STRING_LENGTH, '\0');
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char * begin = reinterpret_cast<char *>(vec_res.data());
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char * pos = begin;
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for (size_t i = 0; i < input_rows_count; ++i)
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{
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const UInt64 hindex = col_hindex->getUInt(i);
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if (!h3IsValid(hindex))
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{
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throw Exception("Invalid H3 index: " + std::to_string(hindex), ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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}
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h3ToString(hindex, pos, H3_INDEX_STRING_LENGTH);
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// move to end of the index
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while (*pos != '\0')
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{
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pos++;
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}
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vec_offsets[i] = ++pos - begin;
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}
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vec_res.resize(pos - begin);
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block.getByPosition(result).column = std::move(col_res);
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}
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};
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void registerFunctionH3ToString(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionH3ToString>();
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}
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}
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#endif
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