greenplumn CLogicalApply 源码
greenplumn CLogicalApply 代码
文件路径:/src/backend/gporca/libgpopt/include/gpopt/operators/CLogicalApply.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright 2011 EMC Corp.
//
// @filename:
// CLogicalApply.h
//
// @doc:
// Logical Apply operator
//---------------------------------------------------------------------------
#ifndef GPOPT_CLogicalApply_H
#define GPOPT_CLogicalApply_H
#include "gpos/base.h"
#include "gpopt/operators/CLogical.h"
#include "naucrates/statistics/CStatistics.h"
namespace gpopt
{
//---------------------------------------------------------------------------
// @class:
// CLogicalApply
//
// @doc:
// Logical Apply operator; parent of different Apply operators used
// in subquery transformations
//
//---------------------------------------------------------------------------
class CLogicalApply : public CLogical
{
private:
protected:
// columns used from Apply's inner child
CColRefArray *m_pdrgpcrInner;
// origin subquery id
EOperatorId m_eopidOriginSubq;
// ctor
explicit CLogicalApply(CMemoryPool *mp);
// ctor
CLogicalApply(CMemoryPool *mp, CColRefArray *pdrgpcrInner,
EOperatorId eopidOriginSubq);
// dtor
~CLogicalApply() override;
public:
CLogicalApply(const CLogicalApply &) = delete;
// match function
BOOL Matches(COperator *pop) const override;
// sensitivity to order of inputs
BOOL
FInputOrderSensitive() const override
{
return true;
}
// inner column references accessor
CColRefArray *
PdrgPcrInner() const
{
return m_pdrgpcrInner;
}
// return a copy of the operator with remapped columns
COperator *
PopCopyWithRemappedColumns(CMemoryPool *, //mp,
UlongToColRefMap *, //colref_mapping,
BOOL //must_exist
) override
{
return PopCopyDefault();
}
// derive partition consumer info
CPartInfo *
DerivePartitionInfo(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override
{
return PpartinfoDeriveCombine(mp, exprhdl);
}
// derive keys
CKeyCollection *
DeriveKeyCollection(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override
{
return PkcCombineKeys(mp, exprhdl);
}
// derive function properties
CFunctionProp *
DeriveFunctionProperties(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override
{
return PfpDeriveFromScalar(mp, exprhdl);
}
//-------------------------------------------------------------------------------------
// Derived Stats
//-------------------------------------------------------------------------------------
// derive statistics
IStatistics *
PstatsDerive(CMemoryPool *mp, CExpressionHandle &exprhdl,
IStatisticsArray * // stats_ctxt
) const override
{
// we should use stats from the corresponding Join tree if decorrelation succeeds
return PstatsDeriveDummy(mp, exprhdl, CStatistics::DefaultRelationRows);
}
// promise level for stat derivation
EStatPromise
Esp(CExpressionHandle & // exprhdl
) const override
{
// whenever we can decorrelate an Apply tree, we should use the corresponding Join tree
return EspLow;
}
//-------------------------------------------------------------------------------------
// 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;
// return true if operator is a correlated apply
virtual BOOL
FCorrelated() const
{
return false;
}
// return true if operator is a left semi apply
virtual BOOL
FLeftSemiApply() const
{
return false;
}
// return true if operator is a left anti semi apply
virtual BOOL
FLeftAntiSemiApply() const
{
return false;
}
// return true if operator can select a subset of input tuples based on some predicate
BOOL
FSelectionOp() const override
{
return true;
}
// origin subquery id
EOperatorId
EopidOriginSubq() const
{
return m_eopidOriginSubq;
}
// print function
IOstream &OsPrint(IOstream &os) const override;
// conversion function
static CLogicalApply *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(CUtils::FApply(pop));
return dynamic_cast<CLogicalApply *>(pop);
}
}; // class CLogicalApply
} // namespace gpopt
#endif // !GPOPT_CLogicalApply_H
// EOF
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