greenplumn CLogicalLeftAntiSemiCorrelatedApply 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CLogicalLeftAntiSemiCorrelatedApply.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2014 VMware, Inc. or its affiliates.
/
/ @filename:
/ CLogicalLeftAntiSemiCorrelatedApply.h
/
/ @doc:
/ Logical Left Anti Semi Correlated Apply operator;
/ a variant of left anti semi apply (for NOT EXISTS subqueries)
/ to capture the need to implement a correlated-execution strategy
/ on the physical side
/---------------------------------------------------------------------------
#ifndef GPOPT_CLogicalLeftAntiSemiCorrelatedApply_H
#define GPOPT_CLogicalLeftAntiSemiCorrelatedApply_H
#include "gpos/base.h"
#include "gpopt/operators/CExpressionHandle.h"
#include "gpopt/operators/CLogicalLeftAntiSemiApply.h"
namespace gpopt
{
/---------------------------------------------------------------------------
/ @class:
/ CLogicalLeftAntiSemiCorrelatedApply
/
/ @doc:
/ Logical Apply operator used in correlated execution of NOT EXISTS subqueries
/
/---------------------------------------------------------------------------
class CLogicalLeftAntiSemiCorrelatedApply : public CLogicalLeftAntiSemiApply
{
private:
public:
CLogicalLeftAntiSemiCorrelatedApply(
const CLogicalLeftAntiSemiCorrelatedApply &) = delete;
/ ctor
explicit CLogicalLeftAntiSemiCorrelatedApply(CMemoryPool *mp)
: CLogicalLeftAntiSemiApply(mp)
{
}
/ ctor
CLogicalLeftAntiSemiCorrelatedApply(CMemoryPool *mp,
CColRefArray *pdrgpcrInner,
EOperatorId eopidOriginSubq)
: CLogicalLeftAntiSemiApply(mp, pdrgpcrInner, eopidOriginSubq)
{
}
/ dtor
~CLogicalLeftAntiSemiCorrelatedApply() override = default;
/ ident accessors
EOperatorId
Eopid() const override
{
return EopLogicalLeftAntiSemiCorrelatedApply;
}
/ return a string for operator name
const CHAR *
SzId() const override
{
return "CLogicalLeftAntiSemiCorrelatedApply";
}
/-------------------------------------------------------------------------------------
/ Transformations
/-------------------------------------------------------------------------------------
/ candidate set of xforms
CXformSet *PxfsCandidates(CMemoryPool *mp) const override;
/-------------------------------------------------------------------------------------
/-------------------------------------------------------------------------------------
/-------------------------------------------------------------------------------------
/ return true if operator is a correlated apply
BOOL
FCorrelated() const override
{
return true;
}
/ return a copy of the operator with remapped columns
COperator *PopCopyWithRemappedColumns(CMemoryPool *mp,
UlongToColRefMap *colref_mapping,
BOOL must_exist) override;
/ conversion function
static CLogicalLeftAntiSemiCorrelatedApply *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopLogicalLeftAntiSemiCorrelatedApply == pop->Eopid());
return dynamic_cast<CLogicalLeftAntiSemiCorrelatedApply *>(pop);
}
}; / class CLogicalLeftAntiSemiCorrelatedApply
} / namespace gpopt
#endif / !GPOPT_CLogicalLeftAntiSemiCorrelatedApply_H
/ EOF
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