greenplumn CLogicalDynamicGet 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CLogicalDynamicGet.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CLogicalDynamicGet.h
/
/ @doc:
/ Dynamic table accessor for partitioned tables
/---------------------------------------------------------------------------
#ifndef GPOPT_CLogicalDynamicGet_H
#define GPOPT_CLogicalDynamicGet_H
#include "gpos/base.h"
#include "gpopt/operators/CLogicalDynamicGetBase.h"
namespace gpopt
{
/ fwd declarations
class CTableDescriptor;
class CName;
class CColRefSet;
/---------------------------------------------------------------------------
/ @class:
/ CLogicalDynamicGet
/
/ @doc:
/ Dynamic table accessor
/
/---------------------------------------------------------------------------
class CLogicalDynamicGet : public CLogicalDynamicGetBase
{
protected:
/ Disjunction of selected child partition's constraints after static pruning
CConstraint *m_partition_cnstrs_disj{nullptr};
/ Has done static pruning
BOOL m_static_pruned{false};
public:
CLogicalDynamicGet(const CLogicalDynamicGet &) = delete;
/ ctors
explicit CLogicalDynamicGet(CMemoryPool *mp);
CLogicalDynamicGet(CMemoryPool *mp, const CName *pnameAlias,
CTableDescriptor *ptabdesc, ULONG ulPartIndex,
CColRefArray *pdrgpcrOutput,
CColRef2dArray *pdrgpdrgpcrPart,
IMdIdArray *partition_mdids,
CConstraint *partition_cnstrs_disj, BOOL static_pruned);
CLogicalDynamicGet(CMemoryPool *mp, const CName *pnameAlias,
CTableDescriptor *ptabdesc, ULONG ulPartIndex,
IMdIdArray *partition_mdids);
/ dtor
~CLogicalDynamicGet() override;
/ ident accessors
EOperatorId
Eopid() const override
{
return EopLogicalDynamicGet;
}
/ return a string for operator name
const CHAR *
SzId() const override
{
return "CLogicalDynamicGet";
}
/ return disjunctive constraint of selected partitions
CConstraint *
GetPartitionConstraintsDisj() const
{
return m_partition_cnstrs_disj;
}
/ return whether static pruning is performed
BOOL
FStaticPruned() const
{
return m_static_pruned;
}
/ operator specific hash function
ULONG HashValue() const override;
/ match function
BOOL Matches(COperator *pop) const override;
/ sensitivity to order of inputs
BOOL FInputOrderSensitive() const override;
/ return a copy of the operator with remapped columns
COperator *PopCopyWithRemappedColumns(CMemoryPool *mp,
UlongToColRefMap *colref_mapping,
BOOL must_exist) override;
/-------------------------------------------------------------------------------------
/ Derived Relational Properties
/-------------------------------------------------------------------------------------
/ derive join depth
ULONG
DeriveJoinDepth(CMemoryPool *, / mp
CExpressionHandle & / exprhdl
) const override
{
return 1;
}
/ derive table descriptor
CTableDescriptor *
DeriveTableDescriptor(CMemoryPool *, / mp
CExpressionHandle & / exprhdl
) const override
{
return m_ptabdesc;
}
/ derive max card
CMaxCard DeriveMaxCard(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override;
/-------------------------------------------------------------------------------------
/ Required Relational Properties
/-------------------------------------------------------------------------------------
/ compute required stat columns of the n-th child
CColRefSet *
PcrsStat(CMemoryPool *, / mp,
CExpressionHandle &, / exprhdl
CColRefSet *, /pcrsInput
ULONG / child_index
) const override
{
GPOS_ASSERT(!"CLogicalDynamicGet has no children");
return nullptr;
}
/-------------------------------------------------------------------------------------
/ Transformations
/-------------------------------------------------------------------------------------
/ candidate set of xforms
CXformSet *PxfsCandidates(CMemoryPool *mp) const override;
/-------------------------------------------------------------------------------------
/ Statistics
/-------------------------------------------------------------------------------------
/ derive statistics
IStatistics *PstatsDerive(CMemoryPool *mp, CExpressionHandle &exprhdl,
IStatisticsArray *stats_ctxt) const override;
/ derive stats from base table using filters on partition and/or index columns
IStatistics *PstatsDeriveFilter(CMemoryPool *mp, CExpressionHandle &exprhdl,
CExpression *pexprFilter) const;
/ stat promise
EStatPromise
Esp(CExpressionHandle &) const override
{
return CLogical::EspHigh;
}
/-------------------------------------------------------------------------------------
/-------------------------------------------------------------------------------------
/-------------------------------------------------------------------------------------
/ conversion function
static CLogicalDynamicGet *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopLogicalDynamicGet == pop->Eopid());
return dynamic_cast<CLogicalDynamicGet *>(pop);
}
/ debug print
IOstream &OsPrint(IOstream &) const override;
}; / class CLogicalDynamicGet
} / namespace gpopt
#endif / !GPOPT_CLogicalDynamicGet_H
/ EOF
相关信息
相关文章
greenplumn CExpressionFactorizer 源码
greenplumn CExpressionHandle 源码
greenplumn CExpressionPreprocessor 源码
greenplumn CExpressionUtils 源码