greenplumn CLogicalLeftSemiApply 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CLogicalLeftSemiApply.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright 2011 EMC Corp.
/
/ @filename:
/ CLogicalLeftSemiApply.h
/
/ @doc:
/ Logical Left Semi Apply operator
/---------------------------------------------------------------------------
#ifndef GPOPT_CLogicalLeftSemiApply_H
#define GPOPT_CLogicalLeftSemiApply_H
#include "gpos/base.h"
#include "gpopt/operators/CLogicalApply.h"
namespace gpopt
{
/---------------------------------------------------------------------------
/ @class:
/ CLogicalLeftSemiApply
/
/ @doc:
/ Logical Apply operator used in EXISTS subquery transformations
/
/---------------------------------------------------------------------------
class CLogicalLeftSemiApply : public CLogicalApply
{
private:
public:
CLogicalLeftSemiApply(const CLogicalLeftSemiApply &) = delete;
/ ctor
explicit CLogicalLeftSemiApply(CMemoryPool *mp) : CLogicalApply(mp)
{
m_pdrgpcrInner = GPOS_NEW(mp) CColRefArray(mp);
}
/ ctor
CLogicalLeftSemiApply(CMemoryPool *mp, CColRefArray *pdrgpcrInner,
EOperatorId eopidOriginSubq)
: CLogicalApply(mp, pdrgpcrInner, eopidOriginSubq)
{
}
/ dtor
~CLogicalLeftSemiApply() override = default;
/ ident accessors
EOperatorId
Eopid() const override
{
return EopLogicalLeftSemiApply;
}
/ return a string for operator name
const CHAR *
SzId() const override
{
return "CLogicalLeftSemiApply";
}
/ return true if we can pull projections up past this operator from its given child
BOOL
FCanPullProjectionsUp(ULONG child_index) const override
{
return (0 == child_index);
}
/-------------------------------------------------------------------------------------
/ Derived Relational Properties
/-------------------------------------------------------------------------------------
/ derive output columns
CColRefSet *DeriveOutputColumns(CMemoryPool *mp,
CExpressionHandle &exprhdl) override;
/ derive not nullable output columns
CColRefSet *
DeriveNotNullColumns(CMemoryPool *, / mp
CExpressionHandle &exprhdl) const override
{
return PcrsDeriveNotNullPassThruOuter(exprhdl);
}
/ derive keys
CKeyCollection *
DeriveKeyCollection(CMemoryPool *, / mp
CExpressionHandle &exprhdl) const override
{
return PkcDeriveKeysPassThru(exprhdl, 0 /*child_index*/);
}
/ derive max card
CMaxCard DeriveMaxCard(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override;
/ derive constraint property
CPropConstraint *
DerivePropertyConstraint(CMemoryPool *, /mp,
CExpressionHandle &exprhdl) const override
{
return PpcDeriveConstraintPassThru(exprhdl, 0 /*ulChild*/);
}
/-------------------------------------------------------------------------------------
/ Transformations
/-------------------------------------------------------------------------------------
/ candidate set of xforms
CXformSet *PxfsCandidates(CMemoryPool *mp) const override;
/-------------------------------------------------------------------------------------
/-------------------------------------------------------------------------------------
/-------------------------------------------------------------------------------------
/ return a copy of the operator with remapped columns
COperator *PopCopyWithRemappedColumns(CMemoryPool *mp,
UlongToColRefMap *colref_mapping,
BOOL must_exist) override;
/ return true if operator is a left semi apply
BOOL
FLeftSemiApply() const override
{
return true;
}
/ conversion function
static CLogicalLeftSemiApply *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(CUtils::FLeftSemiApply(pop));
return dynamic_cast<CLogicalLeftSemiApply *>(pop);
}
}; / class CLogicalLeftSemiApply
} / namespace gpopt
#endif / !GPOPT_CLogicalLeftSemiApply_H
/ EOF
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