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127 lines
3.3 KiB
C++
127 lines
3.3 KiB
C++
#include "config.h"
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#if USE_S2_GEOMETRY
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#include <Columns/ColumnArray.h>
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#include <Columns/ColumnsNumber.h>
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#include <DataTypes/DataTypesNumber.h>
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#include <DataTypes/DataTypeArray.h>
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#include <Functions/FunctionFactory.h>
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#include <Common/typeid_cast.h>
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#include <base/range.h>
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#include "s2_fwd.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 BAD_ARGUMENTS;
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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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/**
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* Each cell in s2 library is a quadrilateral bounded by four geodesics.
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* So, each cell has 4 neighbors
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*/
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class FunctionS2GetNeighbors : public IFunction
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{
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public:
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static constexpr auto name = "s2GetNeighbors";
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static FunctionPtr create(ContextPtr)
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{
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return std::make_shared<FunctionS2GetNeighbors>();
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}
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std::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 { return 1; }
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bool useDefaultImplementationForConstants() const override { return true; }
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bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) 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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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
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"Illegal type {} of argument {} of function {}. Must be UInt64",
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arg->getName(),
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1,
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getName());
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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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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 * col_id = checkAndGetColumn<ColumnUInt64>(non_const_arguments[0].column.get());
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if (!col_id)
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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_id = col_id->getData();
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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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size_t current_offset = 0;
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for (size_t row = 0; row < input_rows_count; ++row)
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{
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const UInt64 id = data_id[row];
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S2CellId cell_id(id);
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if (!cell_id.is_valid())
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throw Exception(ErrorCodes::BAD_ARGUMENTS, "Cell is not valid");
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S2CellId neighbors[4];
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cell_id.GetEdgeNeighbors(neighbors);
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dst_data.reserve(dst_data.size() + 4);
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for (auto & neighbor : neighbors)
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{
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++current_offset;
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dst_data.insert(neighbor.id());
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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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REGISTER_FUNCTION(S2GetNeighbors)
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{
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factory.registerFunction<FunctionS2GetNeighbors>();
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}
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}
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#endif
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