greenplumn CIndexDescriptor 源码
greenplumn CIndexDescriptor 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/metadata/CIndexDescriptor.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CIndexDescriptor.h
//
// @doc:
// Base class for index descriptor
//---------------------------------------------------------------------------
#ifndef GPOPT_CIndexDescriptor_H
#define GPOPT_CIndexDescriptor_H
#include "gpos/base.h"
#include "gpos/common/CDynamicPtrArray.h"
#include "gpopt/base/CColRef.h"
#include "gpopt/metadata/CColumnDescriptor.h"
#include "gpopt/metadata/CTableDescriptor.h"
#include "naucrates/md/IMDId.h"
#include "naucrates/md/IMDIndex.h"
namespace gpopt
{
using namespace gpos;
using namespace gpmd;
//---------------------------------------------------------------------------
// @class:
// CIndexDescriptor
//
// @doc:
// Base class for index descriptor
//
//---------------------------------------------------------------------------
class CIndexDescriptor : public CRefCount,
public DbgPrintMixin<CIndexDescriptor>
{
private:
// mdid of the index
IMDId *m_pmdidIndex;
// name of index
CName m_name;
// array of index key columns
CColumnDescriptorArray *m_pdrgpcoldescKeyCols;
// array of index included columns
CColumnDescriptorArray *m_pdrgpcoldescIncludedCols;
// clustered index
BOOL m_clustered;
// index type
IMDIndex::EmdindexType m_index_type;
public:
CIndexDescriptor(const CIndexDescriptor &) = delete;
// ctor
CIndexDescriptor(CMemoryPool *mp, IMDId *pmdidIndex, const CName &name,
CColumnDescriptorArray *pdrgcoldescKeyCols,
CColumnDescriptorArray *pdrgcoldescIncludedCols,
BOOL is_clustered, IMDIndex::EmdindexType emdindt);
// dtor
~CIndexDescriptor() override;
// number of key columns
ULONG Keys() const;
// number of included columns
ULONG UlIncludedColumns() const;
// index mdid accessor
IMDId *
MDId() const
{
return m_pmdidIndex;
}
// index name
const CName &
Name() const
{
return m_name;
}
// key column descriptors
CColumnDescriptorArray *
PdrgpcoldescKey() const
{
return m_pdrgpcoldescKeyCols;
}
// included column descriptors
CColumnDescriptorArray *
PdrgpcoldescIncluded() const
{
return m_pdrgpcoldescIncludedCols;
}
// is index clustered
BOOL
IsClustered() const
{
return m_clustered;
}
IMDIndex::EmdindexType
IndexType() const
{
return m_index_type;
}
BOOL SupportsIndexOnlyScan() const;
// create an index descriptor
static CIndexDescriptor *Pindexdesc(CMemoryPool *mp,
const CTableDescriptor *ptabdesc,
const IMDIndex *pmdindex);
IOstream &OsPrint(IOstream &os) const;
}; // class CIndexDescriptor
} // namespace gpopt
#endif // !GPOPT_CIndexDescriptor_H
// EOF
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