mirror of
https://github.com/mariadb-corporation/mariadb-columnstore-engine.git
synced 2025-05-10 02:01:04 +03:00
b53c231ca6
This patch improves handling of NULLs in textual fields in ColumnStore. Previously empty strings were considered NULLs and it could be a problem if data scheme allows for empty strings. It was also one of major reasons of behavior difference between ColumnStore and other engines in MariaDB family. Also, this patch fixes some other bugs and incorrect behavior, for example, incorrect comparison for "column <= ''" which evaluates to constant True for all purposes before this patch.
150 lines
3.5 KiB
C++
150 lines
3.5 KiB
C++
/* Copyright (C) 2014 InfiniDB, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; version 2 of
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the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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/***********************************************************************
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* $Id: dmlcolumn.h 9210 2013-01-21 14:10:42Z rdempsey $
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*
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*
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***********************************************************************/
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/** @file */
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#pragma once
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#include <string>
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#include <vector>
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#include "dmlobject.h"
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#include "bytestream.h"
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#include <boost/algorithm/string/case_conv.hpp>
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#include "nullstring.h"
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#define EXPORT
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namespace dmlpackage
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{
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/** @brief concrete implementation of a DMLObject
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* Specifically for representing a database column
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*/
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class DMLColumn : public DMLObject
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{
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public:
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/** @brief ctor
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*/
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EXPORT DMLColumn();
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/** @brief new ctor
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* isNUll is currently not in use. It supposed to indicate whether each value is null or not.
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*/
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EXPORT DMLColumn(std::string name, const std::vector<utils::NullString>& valueList, bool isFromCol = false,
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uint32_t funcScale = 0, bool isNULL = false);
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/** @brief new ctor
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*
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*/
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EXPORT DMLColumn(std::string name, utils::NullString& value, bool isFromCol = false,
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uint32_t funcScale = 0, bool isNULL = false);
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/** @brief dtor
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*/
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EXPORT ~DMLColumn();
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/** @brief read a DMLColumn from a ByteStream
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*
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* @param bytestream the ByteStream to read from
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*/
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EXPORT int read(messageqcpp::ByteStream& bytestream);
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/** @brief write a DML column to a ByteStream
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*
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* @param bytestream the ByteStream to write to
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*/
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EXPORT int write(messageqcpp::ByteStream& bytestream);
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/** @brief get the data for the column
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*/
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const std::vector<utils::NullString>& get_DataVector() const
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{
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return fColValuesList;
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}
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/** @brief get the data for the column
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*/
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bool get_isnull() const
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{
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return fisNULL;
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}
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/** @brief get the fIsFromCol data for the column
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*/
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bool get_isFromCol() const
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{
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return fIsFromCol;
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}
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/** @brief get the fFuncScale data for the column
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*/
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uint32_t get_funcScale() const
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{
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return fFuncScale;
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}
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/** @brief get the column name
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*/
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const std::string get_Name() const
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{
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return fName;
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}
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/** @brief set the column name
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*/
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EXPORT void set_Name(std::string name)
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{
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boost::algorithm::to_lower(name);
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fName = name;
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}
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/** @brief set the NULL flag
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*/
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void set_isnull(bool isNULL)
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{
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fisNULL = isNULL;
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}
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/** @brief set the fIsFromCol flag
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*/
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void set_isFromCol(bool isFromCol)
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{
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fIsFromCol = isFromCol;
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}
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/** @brief set the fFuncScale
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*/
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void set_funcScale(uint32_t funcScale)
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{
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fFuncScale = funcScale;
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}
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protected:
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private:
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std::string fName;
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std::vector<utils::NullString> fColValuesList;
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bool fisNULL;
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bool fIsFromCol;
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uint32_t fFuncScale;
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};
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/** @brief a vector of DMLColumns
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*/
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typedef std::vector<DMLColumn*> ColumnList;
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} // namespace dmlpackage
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#undef EXPORT
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