mariadb-columnstore-engine/dbcon/joblist/subquerytransformer.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: subquerytransformer.h 6370 2010-03-18 02:58:09Z xlou $

/** @file */

#pragma once

#include "elementtype.h"
#include "jobstep.h"
#include "joblist.h"
#include "rowgroup.h"
#include "virtualtable.h"

namespace execplan
{
class CalpontSelectExecutionPlan;

}

namespace joblist
{
struct JobInfo;
class TupleHashJoinStep;

class SubQueryTransformer
{
 public:
  /** @brief SubQueryTransformer constructor
   *  @param jobInfo
   *  @param errorInfo
   */
  SubQueryTransformer(JobInfo*, SErrorInfo&);

  /** @brief SubQueryTransformer constructor
   *  @param jobInfo
   *  @param errorInfo
   *  @param view
   */
  SubQueryTransformer(JobInfo*, SErrorInfo&, const std::string&);

  /** @brief SubQueryTransformer constructor
   *  @param jobInfo
   *  @param errorInfo
   *  @param alias
   *  @param view
   */
  SubQueryTransformer(JobInfo*, SErrorInfo&, const std::string&, const std::string&);

  /** @brief SubQueryTransformer destructor
   */
  virtual ~SubQueryTransformer();

  /** @brief virtual make a subquery step
   *  @param csep the execution plan
   *  @param b if the subquery is in FROM clause
   *  @returns boost::shared_ptr<JobStep>
   */
  virtual SJSTEP& makeSubQueryStep(execplan::CalpontSelectExecutionPlan*, bool b = false);

  /** @brief virtual make a virtual table
   *  @param csep the execution plan
   *  @returns const VirtualTable&
   */
  virtual void updateCorrelateInfo();

  /** @brief virtual void run method
   */
  virtual void run();

  /** @brief virtual outer query jobinfo
   *  @returns JobInfo*
   */
  virtual JobInfo* outJobInfo() const
  {
    return fOutJobInfo;
  }

  /** @brief virtual subquery jobinfo
   *  @returns JobInfo*
   */
  virtual JobInfo* subJobInfo() const
  {
    return fSubJobInfo;
  }

  /** @brief virtual error info pointer
   *  @returns SErrorInfo&
   */
  virtual SErrorInfo& errorInfo() const
  {
    return fErrorInfo;
  }

  /** @brief virtual joblist
   *  @returns STJLP&
   */
  virtual const STJLP& subJobList() const
  {
    return fSubJobList;
  }

  /** @brief virtual subquery step
   *  @returns SJSTEP&
   */
  virtual const SJSTEP& subQueryStep() const
  {
    return fSubQueryStep;
  }

  /** @brief virtual get correlated steps
   *  @returns const JobStepVector&
   */
  virtual JobStepVector& correlatedSteps()
  {
    return fCorrelatedSteps;
  }

  /** @brief get virtual table
   *  @returns const VirtualTable&
   */
  const VirtualTable& virtualTable() const
  {
    return fVtable;
  }

  /** @brief set varbinary support flag
   */
  void setVarbinaryOK()
  {
    fVtable.varbinaryOK(true);
  }

 protected:
  void checkCorrelateInfo(TupleHashJoinStep*, const JobInfo&);

  JobInfo* fOutJobInfo;
  JobInfo* fSubJobInfo;
  SErrorInfo& fErrorInfo;
  JobStepVector fCorrelatedSteps;
  RetColsVector fSubReturnedCols;
  STJLP fSubJobList;
  SJSTEP fSubQueryStep;
  VirtualTable fVtable;

  // disable copy constructor and assignment operator
  SubQueryTransformer(const SubQueryTransformer&);
  SubQueryTransformer& operator=(const SubQueryTransformer&);
};

class SimpleScalarTransformer : public SubQueryTransformer
{
 public:
  /** @brief SimpleScalarTransformer constructor
   *  @param jobInfo
   *  @param errorInfo for error info
   *  @param existFilter indicate if exist filter
   */
  SimpleScalarTransformer(JobInfo* jobInfo, SErrorInfo& errInfo, bool existFilter);

  /** @brief SimpleScalarTransformer constructor
   *  @param SubQueryTransformer
   */
  explicit SimpleScalarTransformer(const SubQueryTransformer& rhs);

  /** @brief SimpleScalarTransformer destructor
   */
  ~SimpleScalarTransformer() override;

  /** @brief virtual void run method
   */
  void run() override;

  /** @brief virtual get scalar result
   *  @param jobInfo
   */
  virtual void getScalarResult();

  /** @brief check if result set is empty
   *  @returns bool
   */
  bool emptyResultSet() const
  {
    return fEmptyResultSet;
  }

  /** @brief retrieve result row
   *  @returns Row
   */
  const rowgroup::Row& resultRow() const
  {
    return fRow;
  }

 protected:
  RowGroupDL* fInputDl;
  int fDlIterator;
  rowgroup::RowGroup fRowGroup;
  rowgroup::Row fRow;
  boost::scoped_array<uint8_t> fRowData;
  bool fEmptyResultSet;
  bool fExistFilter;

  // disable copy constructor and assignment operator
  SimpleScalarTransformer(const SimpleScalarTransformer&);
  SimpleScalarTransformer& operator=(const SimpleScalarTransformer&);
};

}  // namespace joblist