greenplumn CLogicalIndexGet 源码

greenplumn CLogicalIndexGet 代码

文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CLogicalIndexGet.h

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2012 EMC Corp.
//
//	@filename:
//		CLogicalIndexGet.h
//
//	@doc:
//		Basic index accessor
//---------------------------------------------------------------------------
#ifndef GPOPT_CLogicalIndexGet_H
#define GPOPT_CLogicalIndexGet_H

#include "gpos/base.h"

#include "gpopt/base/COrderSpec.h"
#include "gpopt/metadata/CIndexDescriptor.h"
#include "gpopt/operators/CLogical.h"


namespace gpopt
{
// fwd declarations
class CName;
class CColRefSet;

//---------------------------------------------------------------------------
//	@class:
//		CLogicalIndexGet
//
//	@doc:
//		Basic index accessor
//
//---------------------------------------------------------------------------
class CLogicalIndexGet : public CLogical
{
private:
	// index descriptor
	CIndexDescriptor *m_pindexdesc;

	// table descriptor
	CTableDescriptor *m_ptabdesc;

	// origin operator id -- gpos::ulong_max if operator was not generated via a transformation
	ULONG m_ulOriginOpId;

	// alias for table
	const CName *m_pnameAlias;

	// output columns
	CColRefArray *m_pdrgpcrOutput;

	// set representation of output columns
	CColRefSet *m_pcrsOutput;

	// order spec
	COrderSpec *m_pos;

	// distribution columns (empty for master only tables)
	CColRefSet *m_pcrsDist;

public:
	CLogicalIndexGet(const CLogicalIndexGet &) = delete;

	// ctors
	explicit CLogicalIndexGet(CMemoryPool *mp);

	CLogicalIndexGet(CMemoryPool *mp, const IMDIndex *pmdindex,
					 CTableDescriptor *ptabdesc, ULONG ulOriginOpId,
					 const CName *pnameAlias, CColRefArray *pdrgpcrOutput);

	// dtor
	~CLogicalIndexGet() override;

	// ident accessors
	EOperatorId
	Eopid() const override
	{
		return EopLogicalIndexGet;
	}

	// return a string for operator name
	const CHAR *
	SzId() const override
	{
		return "CLogicalIndexGet";
	}

	// distribution columns
	virtual const CColRefSet *
	PcrsDist() const
	{
		return m_pcrsDist;
	}

	// array of output columns
	CColRefArray *
	PdrgpcrOutput() const
	{
		return m_pdrgpcrOutput;
	}

	// origin operator id -- gpos::ulong_max if operator was not generated via a transformation
	ULONG
	UlOriginOpId() const
	{
		return m_ulOriginOpId;
	}

	// index name
	const CName &
	Name() const
	{
		return m_pindexdesc->Name();
	}

	// table alias name
	const CName &
	NameAlias() const
	{
		return *m_pnameAlias;
	}

	// index descriptor
	CIndexDescriptor *
	Pindexdesc() const
	{
		return m_pindexdesc;
	}

	// table descriptor
	CTableDescriptor *
	Ptabdesc() const
	{
		return m_ptabdesc;
	}

	// order spec
	COrderSpec *
	Pos() const
	{
		return m_pos;
	}

	// operator specific hash function
	ULONG HashValue() const override;

	// match function
	BOOL Matches(COperator *pop) const override;

	// sensitivity to order of inputs
	BOOL FInputOrderSensitive() const override;

	// return a copy of the operator with remapped columns
	COperator *PopCopyWithRemappedColumns(CMemoryPool *mp,
										  UlongToColRefMap *colref_mapping,
										  BOOL must_exist) override;

	//-------------------------------------------------------------------------------------
	// Derived Relational Properties
	//-------------------------------------------------------------------------------------

	// derive output columns
	CColRefSet *DeriveOutputColumns(CMemoryPool *mp,
									CExpressionHandle &exprhdl) override;

	// derive outer references
	CColRefSet *DeriveOuterReferences(CMemoryPool *mp,
									  CExpressionHandle &exprhdl) override;

	// derive partition consumer info
	CPartInfo *
	DerivePartitionInfo(CMemoryPool *mp,
						CExpressionHandle &	 //exprhdl
	) const override
	{
		return GPOS_NEW(mp) CPartInfo(mp);
	}

	// derive constraint property
	CPropConstraint *
	DerivePropertyConstraint(CMemoryPool *mp,
							 CExpressionHandle &  // exprhdl
	) const override
	{
		return PpcDeriveConstraintFromTable(mp, m_ptabdesc, m_pdrgpcrOutput);
	}

	// derive key collections
	CKeyCollection *DeriveKeyCollection(
		CMemoryPool *mp, CExpressionHandle &exprhdl) const override;

	// derive join depth
	ULONG
	DeriveJoinDepth(CMemoryPool *,		 // mp
					CExpressionHandle &	 // exprhdl
	) const override
	{
		return 1;
	}

	//-------------------------------------------------------------------------------------
	// Required Relational Properties
	//-------------------------------------------------------------------------------------

	// compute required stat columns of the n-th child
	CColRefSet *
	PcrsStat(CMemoryPool *mp,
			 CExpressionHandle &,  // exprhdl
			 CColRefSet *,		   //pcrsInput
			 ULONG				   // child_index
	) const override
	{
		// TODO:  March 26 2012; statistics derivation for indexes
		return GPOS_NEW(mp) CColRefSet(mp);
	}

	// derive statistics
	IStatistics *PstatsDerive(CMemoryPool *mp, CExpressionHandle &exprhdl,
							  IStatisticsArray *stats_ctxt) const override;

	//-------------------------------------------------------------------------------------
	// Transformations
	//-------------------------------------------------------------------------------------

	// candidate set of xforms
	CXformSet *PxfsCandidates(CMemoryPool *mp) const override;

	// stat promise
	EStatPromise
	Esp(CExpressionHandle &) const override
	{
		return CLogical::EspLow;
	}

	//-------------------------------------------------------------------------------------
	// conversion function
	//-------------------------------------------------------------------------------------

	static CLogicalIndexGet *
	PopConvert(COperator *pop)
	{
		GPOS_ASSERT(nullptr != pop);
		GPOS_ASSERT(EopLogicalIndexGet == pop->Eopid());

		return dynamic_cast<CLogicalIndexGet *>(pop);
	}


	// debug print
	IOstream &OsPrint(IOstream &) const override;

};	// class CLogicalIndexGet

}  // namespace gpopt

#endif	// !GPOPT_CLogicalIndexGet_H

// EOF

相关信息

greenplumn 源码目录

相关文章

greenplumn CExpression 源码

greenplumn CExpressionFactorizer 源码

greenplumn CExpressionHandle 源码

greenplumn CExpressionPreprocessor 源码

greenplumn CExpressionUtils 源码

greenplumn CHashedDistributions 源码

greenplumn CLogical 源码

greenplumn CLogicalApply 源码

greenplumn CLogicalAssert 源码

greenplumn CLogicalBitmapTableGet 源码