greenplumn CScalarSubquery 源码
greenplumn CScalarSubquery 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CScalarSubquery.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CScalarSubquery.h
//
// @doc:
// Class for scalar subqueries
//---------------------------------------------------------------------------
#ifndef GPOPT_CScalarSubquery_H
#define GPOPT_CScalarSubquery_H
#include "gpos/base.h"
#include "gpopt/operators/CScalar.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CScalarSubquery
//
// @doc:
// Scalar subquery
//
//---------------------------------------------------------------------------
class CScalarSubquery : public CScalar
{
private:
// computed column reference
const CColRef *m_pcr;
// is subquery generated from existential subquery?
BOOL m_fGeneratedByExist;
// is subquery generated from quantified subquery?
BOOL m_fGeneratedByQuantified;
public:
CScalarSubquery(const CScalarSubquery &) = delete;
// ctor
CScalarSubquery(CMemoryPool *mp, const CColRef *colref,
BOOL fGeneratedByExist, BOOL fGeneratedByQuantified);
// dtor
~CScalarSubquery() override;
// ident accessors
EOperatorId
Eopid() const override
{
return EopScalarSubquery;
}
// return a string for scalar subquery
const CHAR *
SzId() const override
{
return "CScalarSubquery";
}
// accessor to computed column reference
const CColRef *
Pcr() const
{
return m_pcr;
}
// the type of the scalar expression
IMDId *MdidType() const override;
// operator specific hash function
ULONG HashValue() const override;
// match function
BOOL Matches(COperator *pop) const override;
// sensitivity to order of inputs
BOOL
FInputOrderSensitive() const override
{
return true;
}
// return a copy of the operator with remapped columns
COperator *PopCopyWithRemappedColumns(CMemoryPool *mp,
UlongToColRefMap *colref_mapping,
BOOL must_exist) override;
// return locally used columns
CColRefSet *PcrsUsed(CMemoryPool *mp, CExpressionHandle &exprhdl) override;
// is subquery generated from existential subquery?
BOOL
FGeneratedByExist() const
{
return m_fGeneratedByExist;
}
// is subquery generated from quantified subquery?
BOOL
FGeneratedByQuantified() const
{
return m_fGeneratedByQuantified;
}
// derive partition consumer info
CPartInfo *PpartinfoDerive(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override;
// conversion function
static CScalarSubquery *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopScalarSubquery == pop->Eopid());
return dynamic_cast<CScalarSubquery *>(pop);
}
// print
IOstream &OsPrint(IOstream &os) const override;
}; // class CScalarSubquery
} // namespace gpopt
#endif // !GPOPT_CScalarSubquery_H
// EOF
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