greenplumn CJobTransformation 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/search/CJobTransformation.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 EMC Corp.
/
/ @filename:
/ CJobTransformation.h
/
/ @doc:
/ Transform group expression job
/---------------------------------------------------------------------------
#ifndef GPOPT_CJobTransformation_H
#define GPOPT_CJobTransformation_H
#include "gpopt/search/CJob.h"
#include "gpopt/search/CJobStateMachine.h"
namespace gpopt
{
using namespace gpos;
/ prototypes
class CGroup;
class CGroupExpression;
class CXform;
/---------------------------------------------------------------------------
/ @class:
/ CJobTransformation
/
/ @doc:
/ Runs the given transformation (XForm) rule.
/
/---------------------------------------------------------------------------
class CJobTransformation : public CJob
{
public:
/ transition events of a transformation
enum EEvent
{
eevCompleted,
eevSentinel
};
/ states of a transformation
enum EState
{
estInitialized = 0,
estCompleted,
estSentinel
};
private:
/ shorthand for job state machine
using JSM = CJobStateMachine<EState, estSentinel, EEvent, eevSentinel>;
/ target group expression
CGroupExpression *m_pgexpr;
/ xform to apply to group expression
CXform *m_xform;
/ job state machine
JSM m_jsm;
/ apply transformation action
static EEvent EevtTransform(CSchedulerContext *psc, CJob *pj);
public:
CJobTransformation(const CJobTransformation &) = delete;
/ ctor
CJobTransformation();
/ dtor
~CJobTransformation() override;
/ initialize job
void Init(CGroupExpression *pgexpr, CXform *pxform);
/ schedule a new transformation job
static void ScheduleJob(CSchedulerContext *psc, CGroupExpression *pgexpr,
CXform *pxform, CJob *pjParent);
/ job's main function
BOOL FExecute(CSchedulerContext *psc) override;
#ifdef GPOS_DEBUG
/ print function
IOstream &OsPrint(IOstream &os) const override;
/ dump state machine diagram in graphviz format
virtual IOstream &
OsDiagramToGraphviz(CMemoryPool *mp, IOstream &os,
const WCHAR *wszTitle) const
{
(void) m_jsm.OsDiagramToGraphviz(mp, os, wszTitle);
return os;
}
/ compute unreachable states
void
Unreachable(CMemoryPool *mp, EState **ppestate, ULONG *pulSize) const
{
m_jsm.Unreachable(mp, ppestate, pulSize);
}
#endif / GPOS_DEBUG
/ conversion function
static CJobTransformation *
PjConvert(CJob *pj)
{
GPOS_ASSERT(nullptr != pj);
GPOS_ASSERT(EjtTransformation == pj->Ejt());
return dynamic_cast<CJobTransformation *>(pj);
}
}; / class CJobTransformation
} / namespace gpopt
#endif / !GPOPT_CJobTransformation_H
/ EOF
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