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#include "clickhouse_config.h"
#if USE_H3
#include <Columns/ColumnArray.h>
#include <Columns/ColumnsNumber.h>
#include <DataTypes/DataTypeArray.h>
#include <DataTypes/DataTypesNumber.h>
#include <Functions/FunctionFactory.h>
#include <Functions/IFunction.h>
#include <Common/typeid_cast.h>
#include <IO/WriteHelpers.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;
extern const int INCORRECT_DATA;
}
namespace
{
class FunctionH3Line : public IFunction
{
public:
static constexpr auto name = "h3Line";
static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionH3Line>(); }
std::string getName() const override { return name; }
size_t getNumberOfArguments() const override { return 2; }
bool useDefaultImplementationForConstants() const override { return true; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
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());
arg = arguments[1].get();
if (!WhichDataType(arg).isUInt64())
throw Exception(
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
"Illegal type {} of argument {} of function {}. Must be UInt64",
arg->getName(), 2, getName());
return std::make_shared<DataTypeArray>(std::make_shared<DataTypeUInt64>());
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override
{
auto non_const_arguments = arguments;
for (auto & argument : non_const_arguments)
argument.column = argument.column->convertToFullColumnIfConst();
const auto * col_start_index = checkAndGetColumn<ColumnUInt64>(non_const_arguments[0].column.get());
if (!col_start_index)
throw Exception(
ErrorCodes::ILLEGAL_COLUMN,
"Illegal type {} of argument {} of function {}. Must be UInt64.",
arguments[0].type->getName(),
1,
getName());
const auto & data_start_index = col_start_index->getData();
const auto * col_end_index = checkAndGetColumn<ColumnUInt64>(non_const_arguments[1].column.get());
if (!col_end_index)
throw Exception(
ErrorCodes::ILLEGAL_COLUMN,
"Illegal type {} of argument {} of function {}. Must be UInt64.",
arguments[1].type->getName(),
2,
getName());
const auto & data_end_index = col_end_index->getData();
auto dst = ColumnArray::create(ColumnUInt64::create());
auto & dst_data = typeid_cast<ColumnUInt64 &>(dst->getData());
auto & dst_offsets = dst->getOffsets();
dst_offsets.resize(input_rows_count);
/// First calculate array sizes for all rows and save them in Offsets
UInt64 current_offset = 0;
for (size_t row = 0; row < input_rows_count; ++row)
{
const UInt64 start = data_start_index[row];
const UInt64 end = data_end_index[row];
auto size = gridPathCellsSize(start, end);
if (size < 0)
throw Exception(
ErrorCodes::INCORRECT_DATA,
"Line cannot be computed between start H3 index {} and end H3 index {}",
start, end);
current_offset += size;
dst_offsets[row] = current_offset;
}
/// Allocate based on total size of arrays for all rows
dst_data.getData().resize(current_offset);
/// Fill the array for each row with known size
auto* ptr = dst_data.getData().data();
current_offset = 0;
for (size_t row = 0; row < input_rows_count; ++row)
{
const UInt64 start = data_start_index[row];
const UInt64 end = data_end_index[row];
const auto size = dst_offsets[row] - current_offset;
gridPathCells(start, end, ptr + current_offset);
current_offset += size;
}
return dst;
}
};
}
REGISTER_FUNCTION(H3Line)
{
factory.registerFunction<FunctionH3Line>();
}
}
#endif
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