greenplumn CLogicalPartitionSelector 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CLogicalPartitionSelector.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2014 VMware, Inc. or its affiliates.
/
/ @filename:
/ CLogicalPartitionSelector.h
/
/ @doc:
/ Logical partition selector operator. This is used for DML
/ on partitioned tables
/---------------------------------------------------------------------------
#ifndef GPOPT_CLogicalPartitionSelector_H
#define GPOPT_CLogicalPartitionSelector_H
#include "gpos/base.h"
#include "gpopt/metadata/CPartConstraint.h"
#include "gpopt/operators/CLogical.h"
namespace gpopt
{
/---------------------------------------------------------------------------
/ @class:
/ CLogicalPartitionSelector
/
/ @doc:
/ Logical partition selector operator
/
/---------------------------------------------------------------------------
class CLogicalPartitionSelector : public CLogical
{
private:
/ mdid of partitioned table
IMDId *m_mdid;
/ filter expressions corresponding to various levels
CExpressionArray *m_pdrgpexprFilters;
/ oid column - holds the OIDs for leaf parts
CColRef *m_pcrOid;
public:
CLogicalPartitionSelector(const CLogicalPartitionSelector &) = delete;
/ ctors
explicit CLogicalPartitionSelector(CMemoryPool *mp);
CLogicalPartitionSelector(CMemoryPool *mp, IMDId *mdid,
CExpressionArray *pdrgpexprFilters,
CColRef *pcrOid);
/ dtor
~CLogicalPartitionSelector() override;
/ ident accessors
EOperatorId
Eopid() const override
{
return EopLogicalPartitionSelector;
}
/ operator name
const CHAR *
SzId() const override
{
return "CLogicalPartitionSelector";
}
/ partitioned table mdid
IMDId *
MDId() const
{
return m_mdid;
}
/ oid column
CColRef *
PcrOid() const
{
return m_pcrOid;
}
/ number of partitioning levels
ULONG
UlPartLevels() const
{
return m_pdrgpexprFilters->Size();
}
/ filter expression for a given level
CExpression *
PexprPartFilter(ULONG ulLevel) const
{
return (*m_pdrgpexprFilters)[ulLevel];
}
/ match function
BOOL Matches(COperator *pop) const override;
/ hash function
ULONG HashValue() const override;
/ sensitivity to order of inputs
BOOL
FInputOrderSensitive() const override
{
/ operator has one child
return false;
}
/ return a copy of the operator with remapped columns
COperator *PopCopyWithRemappedColumns(CMemoryPool *mp,
UlongToColRefMap *colref_mapping,
BOOL must_exist) override;
/-------------------------------------------------------------------------------------
/ Derived Relational Properties
/-------------------------------------------------------------------------------------
/ derive output columns
CColRefSet *DeriveOutputColumns(CMemoryPool *mp,
CExpressionHandle &exprhdl) override;
/ derive constraint property
CPropConstraint *
DerivePropertyConstraint(CMemoryPool *, /mp,
CExpressionHandle &exprhdl) const override
{
return PpcDeriveConstraintPassThru(exprhdl, 0 /*ulChild*/);
}
/ derive max card
CMaxCard DeriveMaxCard(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override;
/ derive partition consumer info
CPartInfo *
DerivePartitionInfo(CMemoryPool *, / mp,
CExpressionHandle &exprhdl) const override
{
return PpartinfoPassThruOuter(exprhdl);
}
/ compute required stats columns of the n-th child
CColRefSet *
PcrsStat(CMemoryPool *, / mp
CExpressionHandle &, / exprhdl
CColRefSet *pcrsInput,
ULONG / child_index
) const override
{
return PcrsStatsPassThru(pcrsInput);
}
/-------------------------------------------------------------------------------------
/ Transformations
/-------------------------------------------------------------------------------------
/ candidate set of xforms
CXformSet *PxfsCandidates(CMemoryPool *mp) const override;
/ derive key collections
CKeyCollection *
DeriveKeyCollection(CMemoryPool *, / mp
CExpressionHandle &exprhdl) const override
{
return PkcDeriveKeysPassThru(exprhdl, 0 /* ulChild */);
}
/ derive statistics
IStatistics *
PstatsDerive(CMemoryPool *, /mp,
CExpressionHandle &exprhdl,
IStatisticsArray * /stats_ctxt
) const override
{
return PstatsPassThruOuter(exprhdl);
}
/ stat promise
EStatPromise
Esp(CExpressionHandle &) const override
{
return CLogical::EspHigh;
}
/-------------------------------------------------------------------------------------
/-------------------------------------------------------------------------------------
/-------------------------------------------------------------------------------------
/ conversion function
static CLogicalPartitionSelector *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopLogicalPartitionSelector == pop->Eopid());
return dynamic_cast<CLogicalPartitionSelector *>(pop);
}
/ debug print
IOstream &OsPrint(IOstream &) const override;
}; / class CLogicalPartitionSelector
} / namespace gpopt
#endif / !GPOPT_CLogicalPartitionSelector_H
/ EOF
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