greenplumn IMDRelation 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/md/IMDRelation.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 Greenplum, Inc.
/
/ @filename:
/ IMDRelation.h
/
/ @doc:
/ Interface for relations in the metadata cache
/---------------------------------------------------------------------------
#ifndef GPMD_IMDRelation_H
#define GPMD_IMDRelation_H
#include "gpos/base.h"
#include "naucrates/md/CMDIndexInfo.h"
#include "naucrates/md/IMDCacheObject.h"
#include "naucrates/md/IMDColumn.h"
#include "naucrates/md/IMDPartConstraint.h"
#include "naucrates/statistics/IStatistics.h"
namespace gpdxl
{
/fwd declaration
class CXMLSerializer;
} / namespace gpdxl
namespace gpmd
{
using namespace gpos;
/---------------------------------------------------------------------------
/ @class:
/ IMDRelation
/
/ @doc:
/ Interface for relations in the metadata cache
/
/---------------------------------------------------------------------------
class IMDRelation : public IMDCacheObject
{
public:
/-------------------------------------------------------------------
/ @doc:
/ Storage type of a relation
/-------------------------------------------------------------------
enum Erelstoragetype
{
ErelstorageHeap,
ErelstorageAppendOnlyCols,
ErelstorageAppendOnlyRows,
ErelstorageExternal,
ErelstorageMixedPartitioned,
ErelstorageCompositeType,
ErelstorageSentinel
};
/-------------------------------------------------------------------
/ @doc:
/ Distribution policy of a relation
/-------------------------------------------------------------------
enum Ereldistrpolicy
{
EreldistrMasterOnly,
EreldistrHash,
EreldistrRandom,
EreldistrReplicated,
EreldistrSentinel
};
/ Partition type of a partitioned relation
enum Erelpartitiontype
{
ErelpartitionRange = 'r',
ErelpartitionList = 'l'
};
protected:
/ serialize an array of column ids into a comma-separated string
static CWStringDynamic *ColumnsToStr(CMemoryPool *mp,
ULongPtrArray *colid_array);
public:
/ object type
Emdtype
MDType() const override
{
return EmdtRel;
}
/ is this a temp relation
virtual BOOL IsTemporary() const = 0;
/ storage type (heap, appendonly, ...)
virtual Erelstoragetype RetrieveRelStorageType() const = 0;
/ distribution policy (none, hash, random)
virtual Ereldistrpolicy GetRelDistribution() const = 0;
/ number of columns
virtual ULONG ColumnCount() const = 0;
/ width of a column with regards to the position
virtual DOUBLE ColWidth(ULONG pos) const = 0;
/ does relation have dropped columns
virtual BOOL HasDroppedColumns() const = 0;
/ number of non-dropped columns
virtual ULONG NonDroppedColsCount() const = 0;
/ return the position of the given attribute position excluding dropped columns
virtual ULONG NonDroppedColAt(ULONG pos) const = 0;
/ return the position of a column in the metadata object given the attribute number in the system catalog
virtual ULONG GetPosFromAttno(INT attno) const = 0;
/ return the original positions of all the non-dropped columns
virtual ULongPtrArray *NonDroppedColsArray() const = 0;
/ number of system columns
virtual ULONG SystemColumnsCount() const = 0;
/ retrieve the column at the given position
virtual const IMDColumn *GetMdCol(ULONG pos) const = 0;
/ number of key sets
virtual ULONG KeySetCount() const = 0;
/ key set at given position
virtual const ULongPtrArray *KeySetAt(ULONG pos) const = 0;
/ number of distribution columns
virtual ULONG DistrColumnCount() const = 0;
/ retrieve the column at the given position in the distribution key for the relation
virtual const IMDColumn *GetDistrColAt(ULONG pos) const = 0;
virtual IMDId *GetDistrOpfamilyAt(ULONG pos) const = 0;
/ return true if a hash distributed table needs to be considered as random
virtual BOOL ConvertHashToRandom() const = 0;
/ is this a partitioned table
virtual BOOL IsPartitioned() const = 0;
/ number of partition columns
virtual ULONG PartColumnCount() const = 0;
/ number of partitions
virtual ULONG PartitionCount() const = 0;
/ retrieve the partition column at the given position
virtual const IMDColumn *PartColAt(ULONG pos) const = 0;
/ retrieve list of partition types
virtual CharPtrArray *GetPartitionTypes() const = 0;
/ retrieve the partition type of the given partition level
virtual CHAR PartTypeAtLevel(ULONG pos) const = 0;
/ number of indices
virtual ULONG IndexCount() const = 0;
/ number of triggers
virtual ULONG TriggerCount() const = 0;
/ retrieve the id of the metadata cache index at the given position
virtual IMDId *IndexMDidAt(ULONG pos) const = 0;
/ retrieve the id of the metadata cache trigger at the given position
virtual IMDId *TriggerMDidAt(ULONG pos) const = 0;
/ number of check constraints
virtual ULONG CheckConstraintCount() const = 0;
/ retrieve the id of the check constraint cache at the given position
virtual IMDId *CheckConstraintMDidAt(ULONG pos) const = 0;
/ part constraint
virtual CDXLNode *MDPartConstraint() const = 0;
/ child partition oids
virtual IMdIdArray *
ChildPartitionMdids() const
{
return nullptr;
}
/ relation distribution policy as a string value
static const CWStringConst *GetDistrPolicyStr(
Ereldistrpolicy rel_distr_policy);
/ name of storage type
static const CWStringConst *GetStorageTypeStr(
IMDRelation::Erelstoragetype rel_storage_type);
BOOL
IsAORowOrColTable() const
{
Erelstoragetype st = RetrieveRelStorageType();
return st == ErelstorageAppendOnlyCols ||
st == ErelstorageAppendOnlyRows;
}
};
/ common structure over relation and external relation metadata for index info
using CMDIndexInfoArray = CDynamicPtrArray<CMDIndexInfo, CleanupRelease>;
} / namespace gpmd
#endif / !GPMD_IMDRelation_H
/ EOF
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