greenplumn CScalarSubqueryQuantified 源码
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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