#include "config_functions.h" #if USE_H3 #include #include #include #include #include #include #include #define H3_INDEX_STRING_LENGTH 17 // includes \0 terminator namespace DB { namespace ErrorCodes { extern const int ILLEGAL_TYPE_OF_ARGUMENT; extern const int ILLEGAL_COLUMN; } namespace { class FunctionH3ToString : public IFunction { public: static constexpr auto name = "h3ToString"; static FunctionPtr create(ContextPtr) { return std::make_shared(); } 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 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()); return std::make_shared(); } ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override { const auto * column = checkAndGetColumn(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(); auto col_res = ColumnString::create(); auto & vec_res = col_res->getChars(); auto & vec_offsets = col_res->getOffsets(); vec_offsets.resize(input_rows_count); vec_res.resize_fill(input_rows_count * H3_INDEX_STRING_LENGTH, '\0'); char * begin = reinterpret_cast(vec_res.data()); char * pos = begin; for (size_t row = 0; row < input_rows_count; ++row) { const UInt64 hindex = data[row]; if (!isValidCell(hindex)) throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Invalid H3 index: {}", hindex); h3ToString(hindex, pos, H3_INDEX_STRING_LENGTH); // move to end of the index while (*pos != '\0') pos++; vec_offsets[row] = ++pos - begin; } vec_res.resize(pos - begin); return col_res; } }; } void registerFunctionH3ToString(FunctionFactory & factory) { factory.registerFunction(); } } #endif