greenplumn CLogicalLeftOuterCorrelatedApply 源码
greenplumn CLogicalLeftOuterCorrelatedApply 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CLogicalLeftOuterCorrelatedApply.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright 2012 EMC Corp.
//
// @filename:
// CLogicalLeftOuterCorrelatedApply.h
//
// @doc:
// Logical Left Outer Correlated Apply operator;
// a variant of left outer apply that captures the need to implement a
// correlated-execution strategy on the physical side
//---------------------------------------------------------------------------
#ifndef GPOPT_CLogicalLeftOuterCorrelatedApply_H
#define GPOPT_CLogicalLeftOuterCorrelatedApply_H
#include "gpos/base.h"
#include "gpopt/operators/CLogicalLeftOuterApply.h"
namespace gpopt
{
//---------------------------------------------------------------------------
// @class:
// CLogicalLeftOuterCorrelatedApply
//
// @doc:
// Logical Apply operator used in scalar subquery transformations
//
//---------------------------------------------------------------------------
class CLogicalLeftOuterCorrelatedApply : public CLogicalLeftOuterApply
{
private:
BOOL m_allow_predicate_pushdown{true};
public:
CLogicalLeftOuterCorrelatedApply(const CLogicalLeftOuterCorrelatedApply &) =
delete;
// ctor
CLogicalLeftOuterCorrelatedApply(CMemoryPool *mp,
CColRefArray *pdrgpcrInner,
EOperatorId eopidOriginSubq);
// ctor for patterns
explicit CLogicalLeftOuterCorrelatedApply(CMemoryPool *mp);
// dtor
~CLogicalLeftOuterCorrelatedApply() override = default;
// ident accessors
EOperatorId
Eopid() const override
{
return EopLogicalLeftOuterCorrelatedApply;
}
// return a string for operator name
const CHAR *
SzId() const override
{
return "CLogicalLeftOuterCorrelatedApply";
}
// match function
BOOL Matches(COperator *pop) const override;
// return a copy of the operator with remapped columns
COperator *PopCopyWithRemappedColumns(CMemoryPool *mp,
UlongToColRefMap *colref_mapping,
BOOL must_exist) override;
// applicable transformations
CXformSet *PxfsCandidates(CMemoryPool *mp) const override;
// return true if operator is a correlated apply
BOOL
FCorrelated() const override
{
return true;
}
BOOL
IsPredicatePushDownAllowed() const
{
return m_allow_predicate_pushdown;
}
// conversion function
static CLogicalLeftOuterCorrelatedApply *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopLogicalLeftOuterCorrelatedApply == pop->Eopid());
return dynamic_cast<CLogicalLeftOuterCorrelatedApply *>(pop);
}
}; // class CLogicalLeftOuterCorrelatedApply
} // namespace gpopt
#endif // !GPOPT_CLogicalLeftOuterCorrelatedApply_H
// EOF
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