greenplumn CJobGroupExpression 源码
greenplumn CJobGroupExpression 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/search/CJobGroupExpression.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CJobGroupExpression.h
//
// @doc:
// Superclass of group expression jobs
//---------------------------------------------------------------------------
#ifndef GPOPT_CJobGroupExpression_H
#define GPOPT_CJobGroupExpression_H
#include "gpos/base.h"
#include "gpopt/search/CJob.h"
#include "gpopt/xforms/CXform.h"
namespace gpopt
{
using namespace gpos;
// prototypes
class CGroup;
class CGroupExpression;
//---------------------------------------------------------------------------
// @class:
// CJobGroupExpression
//
// @doc:
// Abstract superclass of all group expression optimization jobs
//
//---------------------------------------------------------------------------
class CJobGroupExpression : public CJob
{
private:
// true if job has scheduled child group jobs
BOOL m_fChildrenScheduled;
// true if job has scheduled transformation jobs
BOOL m_fXformsScheduled;
protected:
// target group expression
CGroupExpression *m_pgexpr{nullptr};
// ctor
CJobGroupExpression() = default;
// dtor
~CJobGroupExpression() override = default;
// has job scheduled child groups ?
BOOL
FChildrenScheduled() const
{
return m_fChildrenScheduled;
}
// set children scheduled
void
SetChildrenScheduled()
{
m_fChildrenScheduled = true;
}
// has job scheduled xform groups ?
BOOL
FXformsScheduled() const
{
return m_fXformsScheduled;
}
// set xforms scheduled
void
SetXformsScheduled()
{
m_fXformsScheduled = true;
}
// initialize job
void Init(CGroupExpression *pgexpr);
// schedule transformation jobs for applicable xforms
virtual void ScheduleApplicableTransformations(CSchedulerContext *psc) = 0;
// schedule jobs for all child groups
virtual void ScheduleChildGroupsJobs(CSchedulerContext *psc) = 0;
// schedule transformation jobs for the given set of xforms
void ScheduleTransformations(CSchedulerContext *psc, CXformSet *xform_set);
// job's function
BOOL FExecute(CSchedulerContext *psc) override = 0;
#ifdef GPOS_DEBUG
// print function
IOstream &OsPrint(IOstream &os) const override = 0;
#endif // GPOS_DEBUG
public:
CJobGroupExpression(const CJobGroupExpression &) = delete;
}; // class CJobGroupExpression
} // namespace gpopt
#endif // !GPOPT_CJobGroupExpression_H
// EOF
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