greenplumn CDrvdPropRelational 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/base/CDrvdPropRelational.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2009 - 2011 EMC CORP.
/
/ @filename:
/ CDrvdPropRelational.h
/
/ @doc:
/ Derived logical properties
/---------------------------------------------------------------------------
#ifndef GPOPT_CDrvdPropRelational_H
#define GPOPT_CDrvdPropRelational_H
#include "gpos/base.h"
#include "gpos/common/CRefCount.h"
#include "gpopt/base/CColRef.h"
#include "gpopt/base/CDrvdProp.h"
#include "gpopt/base/CFunctionProp.h"
#include "gpopt/base/CFunctionalDependency.h"
#include "gpopt/base/CMaxCard.h"
#include "gpopt/base/CPropConstraint.h"
#include "gpopt/metadata/CTableDescriptor.h"
namespace gpopt
{
using namespace gpos;
/ fwd declaration
class CExpressionHandle;
class CColRefSet;
class CReqdPropPlan;
class CKeyCollection;
class CPropConstraint;
class CPartInfo;
/---------------------------------------------------------------------------
/ @class:
/ CDrvdPropRelational
/
/ @doc:
/ Derived logical properties container.
/
/ These are properties than can be inferred from logical expressions or
/ Memo groups. This includes output columns, outer references, primary
/ keys. These properties hold regardless of the physical implementation
/ of an expression.
/
/---------------------------------------------------------------------------
class CDrvdPropRelational : public CDrvdProp
{
friend class CExpression;
/ See member variables (below) with the same name for description on what
/ the property types respresent
enum EDrvdPropType
{
EdptPcrsOutput = 0,
EdptPcrsOuter,
EdptPcrsNotNull,
EdptPcrsCorrelatedApply,
EdptPkc,
EdptPdrgpfd,
EdptMaxCard,
EdptPpartinfo,
EdptPpc,
EdptPfp,
EdptJoinDepth,
EdptTableDescriptor,
EdptSentinel
};
private:
CMemoryPool *m_mp;
/ bitset representing whether property has been derived
CBitSet *m_is_prop_derived;
/ output columns
CColRefSet *m_pcrsOutput;
/ columns not defined in the underlying operator tree
CColRefSet *m_pcrsOuter;
/ output columns that do not allow null values
CColRefSet *m_pcrsNotNull;
/ columns from the inner child of a correlated-apply expression that can be used above the apply expression
CColRefSet *m_pcrsCorrelatedApply;
/ key collection
CKeyCollection *m_pkc;
/ functional dependencies
CFunctionalDependencyArray *m_pdrgpfd;
/ max card
CMaxCard m_maxcard;
/ join depth (number of relations in underlying tree)
ULONG m_ulJoinDepth;
/ partition table consumers
CPartInfo *m_ppartinfo;
/ constraint property
CPropConstraint *m_ppc;
/ function properties
CFunctionProp *m_pfp;
CTableDescriptor *m_table_descriptor;
/ helper for getting applicable FDs from child
static CFunctionalDependencyArray *DeriveChildFunctionalDependencies(
CMemoryPool *mp, ULONG child_index, CExpressionHandle &exprhdl);
/ helper for creating local FDs
static CFunctionalDependencyArray *DeriveLocalFunctionalDependencies(
CMemoryPool *mp, CExpressionHandle &exprhdl);
/ Have all the properties been derived?
/
/ NOTE1: This is set ONLY when Derive() is called. If all the properties
/ are independently derived, m_is_complete will remain false. In that
/ case, even though Derive() would attempt to derive all the properties
/ once again, it should be quick, since each individual member has been
/ cached.
/ NOTE2: Once these properties are detached from the
/ corresponding expression used to derive it, this MUST be set to true,
/ since after the detachment, there will be no way to derive the
/ properties once again.
BOOL m_is_complete;
protected:
/ output columns
CColRefSet *DeriveOutputColumns(CExpressionHandle &);
/ outer references
CColRefSet *DeriveOuterReferences(CExpressionHandle &);
/ nullable columns
CColRefSet *DeriveNotNullColumns(CExpressionHandle &);
/ columns from the inner child of a correlated-apply expression that can be used above the apply expression
CColRefSet *DeriveCorrelatedApplyColumns(CExpressionHandle &);
/ key collection
CKeyCollection *DeriveKeyCollection(CExpressionHandle &);
/ functional dependencies
CFunctionalDependencyArray *DeriveFunctionalDependencies(
CExpressionHandle &);
/ max cardinality
CMaxCard DeriveMaxCard(CExpressionHandle &);
/ join depth
ULONG DeriveJoinDepth(CExpressionHandle &);
/ partition consumers
CPartInfo *DerivePartitionInfo(CExpressionHandle &);
/ constraint property
CPropConstraint *DerivePropertyConstraint(CExpressionHandle &);
/ function properties
CFunctionProp *DeriveFunctionProperties(CExpressionHandle &);
CTableDescriptor *DeriveTableDescriptor(CExpressionHandle &);
public:
CDrvdPropRelational(const CDrvdPropRelational &) = delete;
/ ctor
CDrvdPropRelational(CMemoryPool *mp);
/ dtor
~CDrvdPropRelational() override;
/ type of properties
EPropType
Ept() override
{
return EptRelational;
}
BOOL
IsComplete() const override
{
return m_is_complete;
}
/ derivation function
void Derive(CMemoryPool *mp, CExpressionHandle &exprhdl,
CDrvdPropCtxt *pdpctxt) override;
/ output columns
CColRefSet *GetOutputColumns() const;
/ outer references
CColRefSet *GetOuterReferences() const;
/ nullable columns
CColRefSet *GetNotNullColumns() const;
/ columns from the inner child of a correlated-apply expression that can be used above the apply expression
CColRefSet *GetCorrelatedApplyColumns() const;
/ key collection
CKeyCollection *GetKeyCollection() const;
/ functional dependencies
CFunctionalDependencyArray *GetFunctionalDependencies() const;
/ max cardinality
CMaxCard GetMaxCard() const;
/ join depth
ULONG GetJoinDepth() const;
/ partition consumers
CPartInfo *GetPartitionInfo() const;
/ constraint property
CPropConstraint *GetPropertyConstraint() const;
/ function properties
CFunctionProp *GetFunctionProperties() const;
CTableDescriptor *GetTableDescriptor() const;
/ shorthand for conversion
static CDrvdPropRelational *GetRelationalProperties(CDrvdProp *pdp);
/ check for satisfying required plan properties
BOOL FSatisfies(const CReqdPropPlan *prpp) const override;
/ print function
IOstream &OsPrint(IOstream &os) const override;
}; / class CDrvdPropRelational
} / namespace gpopt
#endif / !GPOPT_CDrvdPropRelational_H
/ EOF
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