mariadb-columnstore-engine/primitives/primproc/dictstep.h

/* Copyright (C) 2014 InfiniDB, Inc.

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License
   as published by the Free Software Foundation; version 2 of
   the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
   MA 02110-1301, USA. */

//
// $Id: dictstep.h 2110 2013-06-19 15:51:38Z bwilkinson $
// C++ Interface: dictstep
//
// Description:
//
//
// Author: Patrick LeBlanc <pleblanc@calpont.com>, (C) 2008
//
// Copyright: See COPYING file that comes with this distribution
//
//

#pragma once

#include "command.h"
#include "primitivemsg.h"

namespace primitiveprocessor
{
class DictStep : public Command
{
 public:
  DictStep();
  virtual ~DictStep();

  void execute();
  void project();
  void project(int64_t* vals);  // used by RTSCommand to redirect input
  void projectIntoRowGroup(rowgroup::RowGroup& rg, uint32_t row);
  void projectIntoRowGroup(rowgroup::RowGroup& rg, int64_t* vals, uint32_t col);
  uint64_t getLBID();

  /* This doesn't do anything for this class...  make it column-specific or not? */
  void nextLBID();
  void createCommand(messageqcpp::ByteStream&);
  void resetCommand(messageqcpp::ByteStream&);

  /* Put bootstrap code here (ie, build the template primitive msg) */
  void prep(int8_t outputType, bool makeAbsRids);

  SCommand duplicate();
  bool operator==(const DictStep&) const;
  bool operator!=(const DictStep&) const;

  int getCompType() const
  {
    return compressionType;
  }
  void setCompType(int ct)
  {
    compressionType = ct;
  }

 private:
  DictStep(const DictStep&);
  DictStep& operator=(const DictStep&);

  struct StringPtr
  {
    const uint8_t* ptr;
    unsigned len;

    StringPtr() : ptr(NULL), len(0)
    {
      ;
    }
    StringPtr(const uint8_t* p, unsigned l) : ptr(p), len(l)
    {
      ;
    }
    utils::ConstString getConstString() const
    {
      return utils::ConstString((const char*)ptr, len);
    }
  };

  void _execute();
  void issuePrimitive(bool isProjection);
  void processResult();
  void projectResult(std::string* tmpStrings);
  void projectResult(StringPtr* tmpStrings);
  void _project();
  void _projectToRG(rowgroup::RowGroup& rg, uint32_t col);

  // struct used for scratch space
  struct OrderedToken
  {
    uint64_t rid;
    uint64_t token;
    uint16_t pos;
    NullString str;
    bool inResult;
    OrderedToken() : inResult(false)
    {
    }
    ~OrderedToken()
    {
    }
  };
  struct TokenSorter
  {
    inline bool operator()(const OrderedToken& c1, const OrderedToken& c2) const
    {
      return (c1.token < c2.token);
    }
  };
  struct PosSorter
  {
    inline bool operator()(const OrderedToken& c1, const OrderedToken& c2) const
    {
      return (c1.pos < c2.pos);
    }
  };

  // bug 3679.  FilterCommand depends on the result being in the same relative
  // order as the input.  These fcns help restore the original order.
  void copyResultToTmpSpace(OrderedToken* ot);
  void copyResultToFinalPosition(OrderedToken* ot);

  // Worst case, 8192 tokens in the msg.  Each is 10 bytes. */
  boost::scoped_array<uint8_t> inputMsg;
  uint32_t tmpResultCounter;
  uint32_t totalResultLength;
  DictInput* primMsg;
  std::vector<uint8_t> result;

  uint64_t lbid;
  uint32_t fbo;
  uint32_t traceFlags;  // probably move this to Command
  uint8_t BOP;
  int64_t* values;
  boost::scoped_array<utils::NullString>* strValues;
  int compressionType;
  messageqcpp::ByteStream filterString;
  uint32_t filterCount;
  uint32_t bufferSize;
  uint32_t charsetNumber;
  uint16_t inputRidCount;

  bool hasEqFilter;
  boost::shared_ptr<primitives::DictEqualityFilter> eqFilter;
  uint8_t eqOp;  // COMPARE_EQ or COMPARE_NE
  uint64_t fMinMax[2];

  friend class RTSCommand;
};

}  // namespace primitiveprocessor