greenplumn CFunctionalDependency 源码
greenplumn CFunctionalDependency 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/base/CFunctionalDependency.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2009 - 2012 EMC CORP.
//
// @filename:
// CFunctionalDependency.h
//
// @doc:
// Functional dependency representation
//---------------------------------------------------------------------------
#ifndef GPOPT_CFunctionalDependency_H
#define GPOPT_CFunctionalDependency_H
#include "gpos/base.h"
#include "gpos/common/CDynamicPtrArray.h"
#include "gpos/common/CRefCount.h"
#include "gpopt/base/CColRefSet.h"
namespace gpopt
{
// fwd declarations
class CFunctionalDependency;
// definition of array of functional dependencies
using CFunctionalDependencyArray =
CDynamicPtrArray<CFunctionalDependency, CleanupRelease>;
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CFunctionalDependency
//
// @doc:
// Functional dependency representation
//
//---------------------------------------------------------------------------
class CFunctionalDependency : public CRefCount,
public DbgPrintMixin<CFunctionalDependency>
{
private:
// the left hand side of the FD
CColRefSet *m_pcrsKey;
// the right hand side of the FD
CColRefSet *m_pcrsDetermined;
public:
CFunctionalDependency(const CFunctionalDependency &) = delete;
// ctor
CFunctionalDependency(CColRefSet *pcrsKey, CColRefSet *pcrsDetermined);
// dtor
~CFunctionalDependency() override;
// key set accessor
CColRefSet *
PcrsKey() const
{
return m_pcrsKey;
}
// determined set accessor
CColRefSet *
PcrsDetermined() const
{
return m_pcrsDetermined;
}
// determine if all FD columns are included in the given column set
BOOL FIncluded(CColRefSet *pcrs) const;
// hash function
virtual ULONG HashValue() const;
// equality function
BOOL Equals(const CFunctionalDependency *pfd) const;
// do the given arguments form a functional dependency
BOOL
FFunctionallyDependent(CColRefSet *pcrsKey, CColRef *colref)
{
GPOS_ASSERT(nullptr != pcrsKey);
GPOS_ASSERT(nullptr != colref);
return m_pcrsKey->Equals(pcrsKey) && m_pcrsDetermined->FMember(colref);
}
// print
IOstream &OsPrint(IOstream &os) const;
// hash function
static ULONG HashValue(const CFunctionalDependencyArray *pdrgpfd);
// equality function
static BOOL Equals(const CFunctionalDependencyArray *pdrgpfdFst,
const CFunctionalDependencyArray *pdrgpfdSnd);
// create a set of all keys in the passed FD's array
static CColRefSet *PcrsKeys(CMemoryPool *mp,
const CFunctionalDependencyArray *pdrgpfd);
// create an array of all keys in the passed FD's array
static CColRefArray *PdrgpcrKeys(CMemoryPool *mp,
const CFunctionalDependencyArray *pdrgpfd);
}; // class CFunctionalDependency
// shorthand for printing
inline IOstream &
operator<<(IOstream &os, CFunctionalDependency &fd)
{
return fd.OsPrint(os);
}
} // namespace gpopt
#endif // !GPOPT_CFunctionalDependency_H
// EOF
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