greenplumn CLogicalLeftAntiSemiApply 源码
greenplumn CLogicalLeftAntiSemiApply 代码
文件路径:/src/backend/gporca/libgpopt/include/gpopt/operators/CLogicalLeftAntiSemiApply.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright 2011 EMC Corp.
//
// @filename:
// CLogicalLeftAntiSemiApply.h
//
// @doc:
// Logical Left Anti Semi Apply operator
//---------------------------------------------------------------------------
#ifndef GPOPT_CLogicalLeftAntiSemiApply_H
#define GPOPT_CLogicalLeftAntiSemiApply_H
#include "gpos/base.h"
#include "gpopt/operators/CExpressionHandle.h"
#include "gpopt/operators/CLogicalApply.h"
namespace gpopt
{
//---------------------------------------------------------------------------
// @class:
// CLogicalLeftAntiSemiApply
//
// @doc:
// Logical Left Anti Semi Apply operator
//
//---------------------------------------------------------------------------
class CLogicalLeftAntiSemiApply : public CLogicalApply
{
private:
public:
CLogicalLeftAntiSemiApply(const CLogicalLeftAntiSemiApply &) = delete;
// ctor
explicit CLogicalLeftAntiSemiApply(CMemoryPool *mp) : CLogicalApply(mp)
{
}
// ctor
CLogicalLeftAntiSemiApply(CMemoryPool *mp, CColRefArray *pdrgpcrInner,
EOperatorId eopidOriginSubq)
: CLogicalApply(mp, pdrgpcrInner, eopidOriginSubq)
{
}
// dtor
~CLogicalLeftAntiSemiApply() override = default;
// ident accessors
EOperatorId
Eopid() const override
{
return EopLogicalLeftAntiSemiApply;
}
// return a string for operator name
const CHAR *
SzId() const override
{
return "CLogicalLeftAntiSemiApply";
}
// 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
{
GPOS_ASSERT(3 == exprhdl.Arity());
return PcrsDeriveOutputPassThru(exprhdl);
}
// derive not nullable output columns
CColRefSet *
DeriveNotNullColumns(CMemoryPool *, // mp
CExpressionHandle &exprhdl) const override
{
return PcrsDeriveNotNullPassThruOuter(exprhdl);
}
// dervive keys
CKeyCollection *DeriveKeyCollection(
CMemoryPool *mp, CExpressionHandle &exprhdl) const override;
// 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 true if operator is a left anti semi apply
BOOL
FLeftAntiSemiApply() 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 CLogicalLeftAntiSemiApply *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(CUtils::FLeftAntiSemiApply(pop));
return dynamic_cast<CLogicalLeftAntiSemiApply *>(pop);
}
}; // class CLogicalLeftAntiSemiApply
} // namespace gpopt
#endif // !GPOPT_CLogicalLeftAntiSemiApply_H
// EOF
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