ClickHouse/src/Functions/h3CellAreaM2.cpp

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#include "config.h"
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#if USE_H3
#include <Columns/ColumnsNumber.h>
#include <DataTypes/DataTypesNumber.h>
#include <Functions/FunctionFactory.h>
#include <Functions/IFunction.h>
#include <IO/WriteHelpers.h>
#include <Common/typeid_cast.h>
#include <base/range.h>
#include <constants.h>
#include <h3api.h>
namespace DB
{
namespace ErrorCodes
{
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
extern const int ILLEGAL_COLUMN;
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extern const int INCORRECT_DATA;
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}
namespace
{
class FunctionH3CellAreaM2 final : public IFunction
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{
public:
static constexpr auto name = "h3CellAreaM2";
static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionH3CellAreaM2>(); }
std::string getName() const override { return name; }
size_t getNumberOfArguments() const override { return 1; }
bool useDefaultImplementationForConstants() const override { return true; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return false; }
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
{
const auto * arg = arguments[0].get();
if (!WhichDataType(arg).isUInt64())
throw Exception(
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
"Illegal type {} of argument {} of function {}. Must be UInt64",
arg->getName(), 1, getName());
return std::make_shared<DataTypeFloat64>();
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override
{
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auto non_const_arguments = arguments;
for (auto & argument : non_const_arguments)
argument.column = argument.column->convertToFullColumnIfConst();
const auto * column = checkAndGetColumn<ColumnUInt64>(non_const_arguments[0].column.get());
if (!column)
throw Exception(
ErrorCodes::ILLEGAL_COLUMN,
"Illegal type {} of argument {} of function {}. Must be UInt64.",
arguments[0].type->getName(),
1,
getName());
const auto & data = column->getData();
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auto dst = ColumnVector<Float64>::create();
auto & dst_data = dst->getData();
dst_data.resize(input_rows_count);
for (size_t row = 0; row < input_rows_count; ++row)
{
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const UInt64 index = data[row];
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CellBoundary boundary{};
auto err = cellToBoundary(index, &boundary);
if (err)
throw Exception(ErrorCodes::INCORRECT_DATA, "Incorrect H3 index: {}, error: {}", index, err);
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Float64 res = cellAreaM2(index);
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dst_data[row] = res;
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}
return dst;
}
};
}
REGISTER_FUNCTION(H3CellAreaM2)
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{
factory.registerFunction<FunctionH3CellAreaM2>();
}
}
#endif