greenplumn CKeyCollection 源码
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
相关信息
相关文章
greenplumn CColConstraintsArrayMapper 源码
0
赞
热门推荐
-
2、 - 优质文章
-
3、 gate.io
-
6、 golang
-
8、 openharmony