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https://github.com/ClickHouse/ClickHouse.git
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142 lines
4.8 KiB
C++
142 lines
4.8 KiB
C++
#include <Functions/FunctionFactory.h>
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#include <Functions/GeoHash.h>
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#include <Functions/FunctionHelpers.h>
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#include <Columns/ColumnString.h>
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#include <DataTypes/DataTypeString.h>
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#include <string>
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#define GEOHASH_MAX_TEXT_LENGTH 16
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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 LOGICAL_ERROR;
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extern const int ILLEGAL_COLUMN;
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extern const int TOO_MANY_ARGUMENTS_FOR_FUNCTION;
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}
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namespace
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{
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// geohashEncode(lon float32/64, lat float32/64, length UInt8) => string
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class FunctionGeohashEncode : public IFunction
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{
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public:
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static constexpr auto name = "geohashEncode";
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static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionGeohashEncode>(); }
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String getName() const override
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{
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return name;
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}
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bool isVariadic() const override { return true; }
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size_t getNumberOfArguments() const override { return 0; }
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ColumnNumbers getArgumentsThatAreAlwaysConstant() const override { return {2}; }
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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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validateArgumentType(*this, arguments, 0, isFloat, "float");
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validateArgumentType(*this, arguments, 1, isFloat, "float");
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if (arguments.size() == 3)
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{
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validateArgumentType(*this, arguments, 2, isInteger, "integer");
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}
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if (arguments.size() > 3)
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{
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throw Exception("Too many arguments for function " + getName() +
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" expected at most 3",
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ErrorCodes::TOO_MANY_ARGUMENTS_FOR_FUNCTION);
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}
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return std::make_shared<DataTypeString>();
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}
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template <typename LonType, typename LatType>
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bool tryExecute(const IColumn * lon_column, const IColumn * lat_column, UInt64 precision_value, ColumnPtr & result) const
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{
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const ColumnVector<LonType> * longitude = checkAndGetColumn<ColumnVector<LonType>>(lon_column);
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const ColumnVector<LatType> * latitude = checkAndGetColumn<ColumnVector<LatType>>(lat_column);
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if (!latitude || !longitude)
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return false;
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auto col_str = ColumnString::create();
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ColumnString::Chars & out_vec = col_str->getChars();
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ColumnString::Offsets & out_offsets = col_str->getOffsets();
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const size_t size = lat_column->size();
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out_offsets.resize(size);
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out_vec.resize(size * (GEOHASH_MAX_TEXT_LENGTH + 1));
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char * begin = reinterpret_cast<char *>(out_vec.data());
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char * pos = begin;
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for (size_t i = 0; i < size; ++i)
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{
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const Float64 longitude_value = longitude->getElement(i);
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const Float64 latitude_value = latitude->getElement(i);
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const size_t encoded_size = geohashEncode(longitude_value, latitude_value, precision_value, pos);
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pos += encoded_size;
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*pos = '\0';
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out_offsets[i] = ++pos - begin;
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}
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out_vec.resize(pos - begin);
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if (!out_offsets.empty() && out_offsets.back() != out_vec.size())
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throw Exception("Column size mismatch (internal logical error)", ErrorCodes::LOGICAL_ERROR);
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result = std::move(col_str);
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return true;
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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 IColumn * longitude = arguments[0].column.get();
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const IColumn * latitude = arguments[1].column.get();
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const UInt64 precision_value = std::min<UInt64>(GEOHASH_MAX_TEXT_LENGTH,
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arguments.size() == 3 ? arguments[2].column->get64(0) : GEOHASH_MAX_TEXT_LENGTH);
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ColumnPtr res_column;
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if (tryExecute<Float32, Float32>(longitude, latitude, precision_value, res_column) ||
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tryExecute<Float64, Float32>(longitude, latitude, precision_value, res_column) ||
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tryExecute<Float32, Float64>(longitude, latitude, precision_value, res_column) ||
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tryExecute<Float64, Float64>(longitude, latitude, precision_value, res_column))
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return res_column;
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std::string arguments_description;
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for (size_t i = 0; i < arguments.size(); ++i)
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{
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if (i != 0)
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arguments_description += ", ";
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arguments_description += arguments[i].column->getName();
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}
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throw Exception("Unsupported argument types: " + arguments_description +
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+ " for function " + getName(),
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ErrorCodes::ILLEGAL_COLUMN);
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}
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};
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}
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void registerFunctionGeohashEncode(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionGeohashEncode>();
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}
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}
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