greenplumn CScalarSubqueryQuantified 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CScalarSubqueryQuantified.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 EMC Corp.
/
/ @filename:
/ CScalarSubqueryQuantified.h
/
/ @doc:
/ Parent class for quantified subquery operators
/---------------------------------------------------------------------------
#ifndef GPOPT_CScalarSubqueryQuantified_H
#define GPOPT_CScalarSubqueryQuantified_H
#include "gpos/base.h"
#include "gpopt/operators/CScalar.h"
#include "gpopt/xforms/CSubqueryHandler.h"
namespace gpopt
{
using namespace gpos;
/ fwd declarations
class CExpressionHandle;
/---------------------------------------------------------------------------
/ @class:
/ CScalarSubqueryQuantified
/
/ @doc:
/ Parent class for quantified subquery operators (ALL/ANY subqueries);
/ A quantified subquery expression has two children:
/ - Logical child: the inner logical expression
/ - Scalar child: the scalar expression in the outer expression that
/ is used in quantified comparison;
/
/ Example: SELECT * from R where a+b = ANY (SELECT c from S);
/ - logical child: (SELECT c from S)
/ - scalar child : (a+b)
/
/---------------------------------------------------------------------------
class CScalarSubqueryQuantified : public CScalar
{
private:
/ id of comparison operator
IMDId *m_scalar_op_mdid;
/ name of comparison operator
const CWStringConst *m_pstrScalarOp;
/ column reference used in comparison
const CColRef *m_pcr;
protected:
/ ctor
CScalarSubqueryQuantified(CMemoryPool *mp, IMDId *scalar_op_mdid,
const CWStringConst *pstrScalarOp,
const CColRef *colref);
/ dtor
~CScalarSubqueryQuantified() override;
public:
CScalarSubqueryQuantified(const CScalarSubqueryQuantified &) = delete;
/ operator mdid accessor
IMDId *MdIdOp() const;
/ operator name accessor
const CWStringConst *PstrOp() const;
/ column reference accessor
const CColRef *
Pcr() const
{
return m_pcr;
}
/ return 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 locally used columns
CColRefSet *PcrsUsed(CMemoryPool *mp, CExpressionHandle &exprhdl) override;
/ derive partition consumer info
CPartInfo *PpartinfoDerive(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override;
/ conversion function
static CScalarSubqueryQuantified *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopScalarSubqueryAny == pop->Eopid() ||
EopScalarSubqueryAll == pop->Eopid());
return dynamic_cast<CScalarSubqueryQuantified *>(pop);
}
/ print
IOstream &OsPrint(IOstream &os) const override;
}; / class CScalarSubqueryQuantified
} / namespace gpopt
#endif / !GPOPT_CScalarSubqueryQuantified_H
/ EOF
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