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117 lines
3.4 KiB
C++
117 lines
3.4 KiB
C++
#include "config.h"
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#if USE_H3
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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 <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 <base/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 ILLEGAL_COLUMN;
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}
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namespace
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{
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class FunctionH3GetFaces : public IFunction
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{
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public:
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static constexpr auto name = "h3GetFaces";
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static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionH3GetFaces>(); }
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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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bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return false; }
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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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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
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"Illegal type {} of argument {} of function {}. Must be UInt64",
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arg->getName(), 1, getName());
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return std::make_shared<DataTypeArray>(std::make_shared<DataTypeUInt8>());
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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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auto non_const_arguments = arguments;
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for (auto & argument : non_const_arguments)
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argument.column = argument.column->convertToFullColumnIfConst();
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const auto * column = checkAndGetColumn<ColumnUInt64>(non_const_arguments[0].column.get());
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if (!column)
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throw Exception(
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ErrorCodes::ILLEGAL_COLUMN,
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"Illegal type {} of argument {} of function {}. Must be UInt64.",
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arguments[0].type->getName(),
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1,
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getName());
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const auto & data = column->getData();
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auto result_column_data = ColumnUInt8::create();
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auto & result_data = result_column_data->getData();
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auto result_column_offsets = ColumnArray::ColumnOffsets::create();
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auto & result_offsets = result_column_offsets->getData();
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result_offsets.resize(input_rows_count);
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auto current_offset = 0;
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std::vector<int> faces;
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for (size_t row = 0; row < input_rows_count; ++row)
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{
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int max_faces = maxFaceCount(data[row]);
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faces.resize(max_faces);
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// function name h3GetFaces (v3.x) changed to getIcosahedronFaces (v4.0.0).
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getIcosahedronFaces(data[row], faces.data());
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for (int i = 0; i < max_faces; ++i)
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{
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// valid icosahedron faces are represented by integers 0-19
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if (faces[i] >= 0 && faces[i] <= 19)
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{
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++current_offset;
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result_data.emplace_back(faces[i]);
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}
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}
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result_offsets[row] = current_offset;
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faces.clear();
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}
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return ColumnArray::create(std::move(result_column_data), std::move(result_column_offsets));
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}
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};
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}
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REGISTER_FUNCTION(H3GetFaces)
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{
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factory.registerFunction<FunctionH3GetFaces>();
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}
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}
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#endif
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