greenplumn CLogicalLeftSemiCorrelatedApply 源码
greenplumn CLogicalLeftSemiCorrelatedApply 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CLogicalLeftSemiCorrelatedApply.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2014 VMware, Inc. or its affiliates.
//
// @filename:
// CLogicalLeftSemiCorrelatedApply.h
//
// @doc:
// Logical Left Semi Correlated Apply operator;
// a variant of left semi apply that captures the need to implement a
// correlated-execution strategy for EXISTS subquery
//---------------------------------------------------------------------------
#ifndef GPOPT_CLogicalLeftSemiCorrelatedApply_H
#define GPOPT_CLogicalLeftSemiCorrelatedApply_H
#include "gpos/base.h"
#include "gpopt/operators/CLogicalLeftSemiApply.h"
namespace gpopt
{
//---------------------------------------------------------------------------
// @class:
// CLogicalLeftSemiCorrelatedApply
//
// @doc:
// Logical Apply operator used in scalar subquery transformations
//
//---------------------------------------------------------------------------
class CLogicalLeftSemiCorrelatedApply : public CLogicalLeftSemiApply
{
private:
public:
CLogicalLeftSemiCorrelatedApply(const CLogicalLeftSemiCorrelatedApply &) =
delete;
// ctor for patterns
explicit CLogicalLeftSemiCorrelatedApply(CMemoryPool *mp);
// ctor
CLogicalLeftSemiCorrelatedApply(CMemoryPool *mp, CColRefArray *pdrgpcrInner,
EOperatorId eopidOriginSubq);
// dtor
~CLogicalLeftSemiCorrelatedApply() override = default;
// ident accessors
EOperatorId
Eopid() const override
{
return EopLogicalLeftSemiCorrelatedApply;
}
// return a string for operator name
const CHAR *
SzId() const override
{
return "CLogicalLeftSemiCorrelatedApply";
}
// applicable transformations
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 CLogicalLeftSemiCorrelatedApply *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopLogicalLeftSemiCorrelatedApply == pop->Eopid());
return dynamic_cast<CLogicalLeftSemiCorrelatedApply *>(pop);
}
}; // class CLogicalLeftSemiCorrelatedApply
} // namespace gpopt
#endif // !GPOPT_CLogicalLeftSemiCorrelatedApply_H
// EOF
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