greenplumn CJobGroupExpressionExploration 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/search/CJobGroupExpressionExploration.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 EMC Corp.
/
/ @filename:
/ CJobGroupExpressionExploration.h
/
/ @doc:
/ Explore group expression job
/---------------------------------------------------------------------------
#ifndef GPOPT_CJobGroupExpressionExploration_H
#define GPOPT_CJobGroupExpressionExploration_H
#include "gpopt/search/CJobGroupExpression.h"
#include "gpopt/search/CJobStateMachine.h"
namespace gpopt
{
using namespace gpos;
/---------------------------------------------------------------------------
/ @class:
/ CJobGroupExpressionExploration
/
/ @doc:
/ Explore group expression optimization job
/
/ Responsible for creating the logical rewrites of a given group
/ expression. Note that a group exploration job entails running a group
/ expression exploration job for each group expression in the underlying
/ group.
/
/---------------------------------------------------------------------------
class CJobGroupExpressionExploration : public CJobGroupExpression
{
public:
/ transition events of group expression exploration
enum EEvent
{
eevExploringChildren, / child groups exploration is in progress
eevChildrenExplored, / done with children exploration
eevExploringSelf, / self exploration is in progress
eevSelfExplored, / done with exploring group expression
eevFinalized, / done with exploration
eevSentinel
};
/ states of group expression exploration
enum EState
{
estInitialized = 0, / initial state
estChildrenExplored, / child groups explored
estSelfExplored, / group expression explored
estCompleted, / done exploration
estSentinel
};
private:
/ shorthand for job state machine
using JSM = CJobStateMachine<EState, estSentinel, EEvent, eevSentinel>;
/ job state machine
JSM m_jsm;
/ explore child groups action
static EEvent EevtExploreChildren(CSchedulerContext *psc, CJob *pj);
/ explore group expression action
static EEvent EevtExploreSelf(CSchedulerContext *psc, CJob *pj);
/ finalize action
static EEvent EevtFinalize(CSchedulerContext *psc, CJob *pj);
protected:
/ schedule transformation jobs for applicable xforms
void ScheduleApplicableTransformations(CSchedulerContext *psc) override;
/ schedule exploration jobs for all child groups
void ScheduleChildGroupsJobs(CSchedulerContext *psc) override;
public:
CJobGroupExpressionExploration(const CJobGroupExpressionExploration &) =
delete;
/ ctor
CJobGroupExpressionExploration();
/ dtor
~CJobGroupExpressionExploration() override;
/ initialize job
void Init(CGroupExpression *pgexpr);
/ schedule a new group expression exploration job
static void ScheduleJob(CSchedulerContext *psc, CGroupExpression *pgexpr,
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 CJobGroupExpressionExploration *
PjConvert(CJob *pj)
{
GPOS_ASSERT(nullptr != pj);
GPOS_ASSERT(EjtGroupExpressionExploration == pj->Ejt());
return dynamic_cast<CJobGroupExpressionExploration *>(pj);
}
}; / class CJobGroupExpressionExploration
} / namespace gpopt
#endif / !GPOPT_CJobGroupExpressionExploration_H
/ EOF
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