greenplumn CLogicalDynamicGet 源码

greenplumn CLogicalDynamicGet 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2012 EMC Corp.
//
//	@filename:
//		CLogicalDynamicGet.h
//
//	@doc:
//		Dynamic table accessor for partitioned tables
//---------------------------------------------------------------------------
#ifndef GPOPT_CLogicalDynamicGet_H
#define GPOPT_CLogicalDynamicGet_H

#include "gpos/base.h"

#include "gpopt/operators/CLogicalDynamicGetBase.h"

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

//---------------------------------------------------------------------------
//	@class:
//		CLogicalDynamicGet
//
//	@doc:
//		Dynamic table accessor
//
//---------------------------------------------------------------------------
class CLogicalDynamicGet : public CLogicalDynamicGetBase
{
protected:
	// Disjunction of selected child partition's constraints after static pruning
	CConstraint *m_partition_cnstrs_disj{nullptr};

	// Has done static pruning
	BOOL m_static_pruned{false};

public:
	CLogicalDynamicGet(const CLogicalDynamicGet &) = delete;

	// ctors
	explicit CLogicalDynamicGet(CMemoryPool *mp);

	CLogicalDynamicGet(CMemoryPool *mp, const CName *pnameAlias,
					   CTableDescriptor *ptabdesc, ULONG ulPartIndex,
					   CColRefArray *pdrgpcrOutput,
					   CColRef2dArray *pdrgpdrgpcrPart,
					   IMdIdArray *partition_mdids,
					   CConstraint *partition_cnstrs_disj, BOOL static_pruned);

	CLogicalDynamicGet(CMemoryPool *mp, const CName *pnameAlias,
					   CTableDescriptor *ptabdesc, ULONG ulPartIndex,
					   IMdIdArray *partition_mdids);

	// dtor
	~CLogicalDynamicGet() override;

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

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

	// return disjunctive constraint of selected partitions
	CConstraint *
	GetPartitionConstraintsDisj() const
	{
		return m_partition_cnstrs_disj;
	}

	// return whether static pruning is performed
	BOOL
	FStaticPruned() const
	{
		return m_static_pruned;
	}

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

	// derive table descriptor
	CTableDescriptor *
	DeriveTableDescriptor(CMemoryPool *,	   // mp
						  CExpressionHandle &  // exprhdl
	) const override
	{
		return m_ptabdesc;
	}

	// derive max card
	CMaxCard DeriveMaxCard(CMemoryPool *mp,
						   CExpressionHandle &exprhdl) const override;


	//-------------------------------------------------------------------------------------
	// 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
	{
		GPOS_ASSERT(!"CLogicalDynamicGet has no children");
		return nullptr;
	}

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

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

	//-------------------------------------------------------------------------------------
	// Statistics
	//-------------------------------------------------------------------------------------

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

	// derive stats from base table using filters on partition and/or index columns
	IStatistics *PstatsDeriveFilter(CMemoryPool *mp, CExpressionHandle &exprhdl,
									CExpression *pexprFilter) const;

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

	//-------------------------------------------------------------------------------------
	//-------------------------------------------------------------------------------------
	//-------------------------------------------------------------------------------------

	// conversion function
	static CLogicalDynamicGet *
	PopConvert(COperator *pop)
	{
		GPOS_ASSERT(nullptr != pop);
		GPOS_ASSERT(EopLogicalDynamicGet == pop->Eopid());

		return dynamic_cast<CLogicalDynamicGet *>(pop);
	}

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

};	// class CLogicalDynamicGet

}  // namespace gpopt


#endif	// !GPOPT_CLogicalDynamicGet_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