#include #include #include #include #include #include #include #include #include /** The function returns 64bit hash value that is identical for similar queries. * See also 'normalizeQuery'. This function is only slightly more efficient. */ namespace DB { namespace ErrorCodes { extern const int ILLEGAL_COLUMN; extern const int ILLEGAL_TYPE_OF_ARGUMENT; } namespace { template struct Impl { static void vector( const ColumnString::Chars & data, const ColumnString::Offsets & offsets, PaddedPODArray & res_data) { size_t size = offsets.size(); res_data.resize(size); ColumnString::Offset prev_src_offset = 0; for (size_t i = 0; i < size; ++i) { ColumnString::Offset curr_src_offset = offsets[i]; res_data[i] = normalizedQueryHash( reinterpret_cast(&data[prev_src_offset]), reinterpret_cast(&data[curr_src_offset - 1])); prev_src_offset = offsets[i]; } } }; template class FunctionNormalizedQueryHash : public IFunction { public: static constexpr auto name = keep_names ? "normalizedQueryHashKeepNames" : "normalizedQueryHash"; static FunctionPtr create(ContextPtr) { return std::make_shared(); } String getName() const override { return name; } size_t getNumberOfArguments() const override { return 1; } DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override { if (!isString(arguments[0])) throw Exception("Illegal type " + arguments[0]->getName() + " of argument of function " + getName(), ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT); return std::make_shared(); } bool useDefaultImplementationForConstants() const override { return true; } bool isSuitableForShortCircuitArgumentsExecution() const override { return true; } ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t /*input_rows_count*/) const override { const ColumnPtr column = arguments[0].column; if (const ColumnString * col = checkAndGetColumn(column.get())) { auto col_res = ColumnUInt64::create(); typename ColumnUInt64::Container & vec_res = col_res->getData(); vec_res.resize(col->size()); Impl::vector(col->getChars(), col->getOffsets(), vec_res); return col_res; } else throw Exception("Illegal column " + arguments[0].column->getName() + " of argument of function " + getName(), ErrorCodes::ILLEGAL_COLUMN); } }; } void registerFunctionNormalizedQueryHash(FunctionFactory & factory) { factory.registerFunction>(); factory.registerFunction>(); } }