greenplumn IMDIndex 源码
greenplumn IMDIndex 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/md/IMDIndex.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// IMDIndex.h
//
// @doc:
// Interface for indexes in the metadata cache
//---------------------------------------------------------------------------
#ifndef GPMD_IMDIndex_H
#define GPMD_IMDIndex_H
#include "gpos/base.h"
#include "naucrates/md/IMDCacheObject.h"
namespace gpmd
{
using namespace gpos;
// fwd decl
class IMDPartConstraint;
class IMDScalarOp;
//---------------------------------------------------------------------------
// @class:
// IMDIndex
//
// @doc:
// Interface for indexes in the metadata cache
//
//---------------------------------------------------------------------------
class IMDIndex : public IMDCacheObject
{
public:
// index type
enum EmdindexType
{
EmdindBtree, // btree
EmdindBitmap, // bitmap
EmdindGist, // gist using btree or bitmap
EmdindGin, // gin using btree or bitmap
EmdindBrin, // brin
EmdindSentinel
};
// object type
Emdtype
MDType() const override
{
return EmdtInd;
}
// is the index clustered
virtual BOOL IsClustered() const = 0;
// is the index partitioned
virtual BOOL IsPartitioned() const = 0;
// index type
virtual EmdindexType IndexType() const = 0;
// number of keys
virtual ULONG Keys() const = 0;
// return the n-th key column
virtual ULONG KeyAt(ULONG pos) const = 0;
// return the position of the key column
virtual ULONG GetKeyPos(ULONG pos) const = 0;
// number of included columns
virtual ULONG IncludedCols() const = 0;
// return the n-th included column
virtual ULONG IncludedColAt(ULONG pos) const = 0;
// return the position of the included column
virtual ULONG GetIncludedColPos(ULONG column) const = 0;
// part constraint
virtual IMDPartConstraint *MDPartConstraint() const = 0;
// type id of items returned by the index
virtual IMDId *GetIndexRetItemTypeMdid() const = 0;
// check if given scalar comparison can be used with the index key
// at the specified position
virtual BOOL IsCompatible(const IMDScalarOp *md_scalar_op,
ULONG key_pos) const = 0;
// child index oids
virtual IMdIdArray *ChildIndexMdids() const = 0;
// index type as a string value
static const CWStringConst *GetDXLStr(EmdindexType index_type);
};
} // namespace gpmd
#endif // !GPMD_IMDIndex_H
// EOF
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