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119 lines
3.7 KiB
C++
119 lines
3.7 KiB
C++
#if !defined(ARCADIA_BUILD)
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# include "config_functions.h"
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#endif
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#if USE_H3
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#include <vector>
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#include <Columns/ColumnArray.h>
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#include <Columns/ColumnsNumber.h>
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#include <DataTypes/DataTypeArray.h>
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#include <DataTypes/DataTypesNumber.h>
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#include <DataTypes/IDataType.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 <ext/range.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_TYPE_OF_ARGUMENT;
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extern const int PARAMETER_OUT_OF_BOUND;
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}
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namespace
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{
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class FunctionH3KRing : public IFunction
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{
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public:
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static constexpr auto name = "h3kRing";
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static FunctionPtr create(const Context &) { return std::make_shared<FunctionH3KRing>(); }
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std::string getName() const override { return name; }
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size_t getNumberOfArguments() const override { return 2; }
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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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const 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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arg = arguments[1].get();
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if (!isInteger(arg))
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throw Exception(
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"Illegal type " + arg->getName() + " of argument " + std::to_string(2) + " of function " + getName() + ". Must be integer",
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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return std::make_shared<DataTypeArray>(std::make_shared<DataTypeUInt64>());
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}
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ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override
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{
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const auto * col_hindex = arguments[0].column.get();
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const auto * col_k = arguments[1].column.get();
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auto dst = ColumnArray::create(ColumnUInt64::create());
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auto & dst_data = dst->getData();
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auto & dst_offsets = dst->getOffsets();
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dst_offsets.resize(input_rows_count);
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auto current_offset = 0;
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std::vector<H3Index> hindex_vec;
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for (const auto row : ext::range(0, input_rows_count))
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{
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const H3Index origin_hindex = col_hindex->getUInt(row);
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const int k = col_k->getInt(row);
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/// Overflow is possible. The function maxKringSize does not check for overflow.
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/// The calculation is similar to square of k but several times more.
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/// Let's use huge underestimation as the safe bound. We should not allow to generate too large arrays nevertheless.
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constexpr auto max_k = 10000;
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if (k > max_k)
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throw Exception(ErrorCodes::PARAMETER_OUT_OF_BOUND, "Too large 'k' argument for {} function, maximum {}", getName(), max_k);
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if (k < 0)
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throw Exception(ErrorCodes::PARAMETER_OUT_OF_BOUND, "Argument 'k' for {} function must be non negative", getName());
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const auto vec_size = maxKringSize(k);
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hindex_vec.resize(vec_size);
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kRing(origin_hindex, k, hindex_vec.data());
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dst_data.reserve(dst_data.size() + vec_size);
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for (auto hindex : hindex_vec)
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{
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if (hindex != 0)
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{
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++current_offset;
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dst_data.insert(hindex);
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}
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}
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dst_offsets[row] = current_offset;
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}
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return dst;
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}
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};
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}
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void registerFunctionH3KRing(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionH3KRing>();
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}
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}
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#endif
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