greenplumn CColRefSet 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/base/CColRefSet.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2009 Greenplum, Inc.
/
/ @filename:
/ CColRefSet.h
/
/ @doc:
/ Implementation of column reference sets based on bitset
/---------------------------------------------------------------------------
#ifndef GPOS_CColRefSet_H
#define GPOS_CColRefSet_H
#include "gpos/base.h"
#include "gpos/common/CBitSet.h"
#include "gpopt/base/CColRef.h"
#define GPOPT_COLREFSET_SIZE 1024
namespace gpopt
{
/ fwd decl
class CColRefSet;
/ short hand for colref set array
using CColRefSetArray = CDynamicPtrArray<CColRefSet, CleanupRelease>;
/ hash map mapping CColRef -> CColRefSet
using ColRefToColRefSetMap =
CHashMap<CColRef, CColRefSet, CColRef::HashValue, CColRef::Equals,
CleanupNULL<CColRef>, CleanupRelease<CColRefSet>>;
/ hash map mapping INT -> CColRef
using IntToColRefMap =
CHashMap<INT, CColRef, gpos::HashValue<INT>, gpos::Equals<INT>,
CleanupDelete<INT>, CleanupNULL<CColRef>>;
/---------------------------------------------------------------------------
/ @class:
/ CColRefSet
/
/ @doc:
/ Column reference sets based on bitsets
/
/ Redefine accessors by bit index to be private to make super class'
/ member functions inaccessible
/
/---------------------------------------------------------------------------
class CColRefSet : public CBitSet, public DbgPrintMixin<CColRefSet>
{
/ bitset iter needs to access internals
friend class CColRefSetIter;
private:
/ determine if bit is set
BOOL Get(ULONG ulBit) const;
/ set given bit; return previous value
BOOL ExchangeSet(ULONG ulBit);
/ clear given bit; return previous value
BOOL ExchangeClear(ULONG ulBit);
public:
/ ctor
explicit CColRefSet(CMemoryPool *mp,
ULONG ulSizeBits = GPOPT_COLREFSET_SIZE);
explicit CColRefSet(CMemoryPool *mp, const CColRefSet &);
/ ctor, copy from col refs array
CColRefSet(CMemoryPool *mp, const CColRefArray *colref_array,
ULONG ulSizeBits = GPOPT_COLREFSET_SIZE);
/ dtor
~CColRefSet() override;
/ determine if bit is set
BOOL FMember(const CColRef *colref) const;
/ return random member
CColRef *PcrAny() const;
/ return first member
CColRef *PcrFirst() const;
/ include column
void Include(const CColRef *colref);
/ include column array
void Include(const CColRefArray *colref_array);
/ include column set
void Include(const CColRefSet *pcrs);
/ remove column
void Exclude(const CColRef *colref);
/ remove column array
void Exclude(const CColRefArray *colref_array);
/ remove column set
void Exclude(const CColRefSet *pcrs);
/ replace column with another column
void Replace(const CColRef *pcrOut, const CColRef *pcrIn);
/ replace column array with another column array
void Replace(const CColRefArray *pdrgpcrOut, const CColRefArray *pdrgpcrIn);
/ check if the current colrefset is a subset of any of the colrefsets
/ in the given array
BOOL FContained(const CColRefSetArray *pdrgpcrs);
/ check if current colrefset intersects with the given colrefset
BOOL FIntersects(const CColRefSet *pcrs);
/ convert to array
CColRefArray *Pdrgpcr(CMemoryPool *mp) const;
/ convert to id colref map
IntToColRefMap *Phmicr(CMemoryPool *mp) const;
/ hash function
ULONG HashValue();
/ debug print
IOstream &OsPrint(IOstream &os) const;
IOstream &OsPrint(IOstream &os, ULONG ulLenMax) const;
/ extract all column ids
void ExtractColIds(CMemoryPool *mp, ULongPtrArray *colids) const;
/ are the columns in the column reference set covered by the array of column ref sets
static BOOL FCovered(CColRefSetArray *pdrgpcrs, CColRefSet *pcrs);
}; / class CColRefSet
/ shorthand for printing
inline IOstream &
operator<<(IOstream &os, CColRefSet &crf)
{
return crf.OsPrint(os);
}
} / namespace gpopt
#endif / !GPOS_CColRefSet_H
/ EOF
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