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128 lines
4.0 KiB
C++
128 lines
4.0 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 <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 <IO/WriteHelpers.h>
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#include <common/range.h>
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#include <constants.h>
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#include <h3api.h>
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static constexpr size_t MAX_ARRAY_SIZE = 1 << 30;
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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 ARGUMENT_OUT_OF_BOUND;
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extern const int TOO_LARGE_ARRAY_SIZE;
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}
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namespace
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{
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class FunctionH3ToChildren : public IFunction
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{
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public:
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static constexpr auto name = "h3ToChildren";
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static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionH3ToChildren>(); }
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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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bool isSuitableForShortCircuitArgumentsExecution() 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(), 1, getName());
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arg = arguments[1].get();
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if (!WhichDataType(arg).isUInt8())
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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 UInt8",
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arg->getName(), 2, 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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const auto * col_hindex = arguments[0].column.get();
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const auto * col_resolution = 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 : collections::range(0, input_rows_count))
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{
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const UInt64 parent_hindex = col_hindex->getUInt(row);
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const UInt8 child_resolution = col_resolution->getUInt(row);
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if (child_resolution > MAX_H3_RES)
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throw Exception(
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ErrorCodes::ARGUMENT_OUT_OF_BOUND,
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"The argument 'resolution' ({}) of function {} is out of bounds because the maximum resolution in H3 library is {}",
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toString(child_resolution), getName(), toString(MAX_H3_RES));
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const size_t vec_size = cellToChildrenSize(parent_hindex, child_resolution);
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if (vec_size > MAX_ARRAY_SIZE)
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throw Exception(
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ErrorCodes::TOO_LARGE_ARRAY_SIZE,
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"The result of function {} (array of {} elements) will be too large with resolution argument = {}",
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getName(), toString(vec_size), toString(child_resolution));
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hindex_vec.resize(vec_size);
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cellToChildren(parent_hindex, child_resolution, 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 registerFunctionH3ToChildren(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionH3ToChildren>();
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}
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}
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#endif
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