greenplumn CKeyCollection 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/base/CKeyCollection.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2009 - 2012 EMC CORP.
/
/ @filename:
/ CKeyCollection.h
/
/ @doc:
/ Encodes key sets for a relation
/---------------------------------------------------------------------------
#ifndef GPOPT_CKeyCollection_H
#define GPOPT_CKeyCollection_H
#include "gpos/base.h"
#include "gpos/common/CDynamicPtrArray.h"
#include "gpos/common/CRefCount.h"
#include "gpopt/base/CColRefSet.h"
namespace gpopt
{
using namespace gpos;
/---------------------------------------------------------------------------
/ @class:
/ CKeyCollection
/
/ @doc:
/ Captures sets of keys for a relation
/
/---------------------------------------------------------------------------
class CKeyCollection : public CRefCount, public DbgPrintMixin<CKeyCollection>
{
private:
/ array of key sets
CColRefSetArray *m_pdrgpcrs;
public:
CKeyCollection(const CKeyCollection &) = delete;
/ ctors
explicit CKeyCollection(CMemoryPool *mp);
CKeyCollection(CMemoryPool *mp, CColRefSet *pcrs);
CKeyCollection(CMemoryPool *mp, CColRefArray *colref_array);
/ dtor
~CKeyCollection() override;
/ add individual set -- takes ownership
void Add(CColRefSet *pcrs);
/ check if set forms a key
BOOL FKey(const CColRefSet *pcrs, BOOL fExactMatch = true) const;
/ check if an array of columns constitutes a key
BOOL FKey(CMemoryPool *mp, const CColRefArray *colref_array) const;
/ trim off non-key columns
CColRefArray *PdrgpcrTrim(CMemoryPool *mp,
const CColRefArray *colref_array) const;
/ extract a key
CColRefArray *PdrgpcrKey(CMemoryPool *mp) const;
/ extract a hashable key
CColRefArray *PdrgpcrHashableKey(CMemoryPool *mp) const;
/ extract key at given position
CColRefArray *PdrgpcrKey(CMemoryPool *mp, ULONG ul) const;
/ extract key at given position
CColRefSet *PcrsKey(CMemoryPool *mp, ULONG ul) const;
/ number of keys
ULONG
Keys() const
{
return m_pdrgpcrs->Size();
}
/ print
IOstream &OsPrint(IOstream &os) const;
}; / class CKeyCollection
/ shorthand for printing
inline IOstream &
operator<<(IOstream &os, CKeyCollection &kc)
{
return kc.OsPrint(os);
}
} / namespace gpopt
#endif / !GPOPT_CKeyCollection_H
/ EOF
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