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