greenplumn CScalarSubqueryExistential 源码
greenplumn CScalarSubqueryExistential 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CScalarSubqueryExistential.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CScalarSubqueryExistential.h
//
// @doc:
// Parent class for existential subquery operators
//---------------------------------------------------------------------------
#ifndef GPOPT_CScalarSubqueryExistential_H
#define GPOPT_CScalarSubqueryExistential_H
#include "gpos/base.h"
#include "gpopt/operators/CScalar.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CScalarSubqueryExistential
//
// @doc:
// Parent class for EXISTS/NOT EXISTS subquery operators
//
//---------------------------------------------------------------------------
class CScalarSubqueryExistential : public CScalar
{
private:
public:
CScalarSubqueryExistential(const CScalarSubqueryExistential &) = delete;
// ctor
CScalarSubqueryExistential(CMemoryPool *mp);
// dtor
~CScalarSubqueryExistential() override;
// return the type of the scalar expression
IMDId *MdidType() 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 PopCopyDefault();
}
// derive partition consumer info
CPartInfo *PpartinfoDerive(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override;
// conversion function
static CScalarSubqueryExistential *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopScalarSubqueryExists == pop->Eopid() ||
EopScalarSubqueryNotExists == pop->Eopid());
return dynamic_cast<CScalarSubqueryExistential *>(pop);
}
}; // class CScalarSubqueryExistential
} // namespace gpopt
#endif // !GPOPT_CScalarSubqueryExistential_H
// EOF
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