greenplumn CScalarSubqueryExists 源码
greenplumn CScalarSubqueryExists 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CScalarSubqueryExists.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CScalarSubqueryExists.h
//
// @doc:
// Scalar subquery EXISTS operator
//---------------------------------------------------------------------------
#ifndef GPOPT_CScalarSubqueryExists_H
#define GPOPT_CScalarSubqueryExists_H
#include "gpos/base.h"
#include "gpopt/operators/CScalarSubqueryExistential.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CScalarSubqueryExists
//
// @doc:
// Scalar subquery EXISTS.
//
//---------------------------------------------------------------------------
class CScalarSubqueryExists : public CScalarSubqueryExistential
{
private:
public:
CScalarSubqueryExists(const CScalarSubqueryExists &) = delete;
// ctor
CScalarSubqueryExists(CMemoryPool *mp) : CScalarSubqueryExistential(mp)
{
}
// dtor
~CScalarSubqueryExists() override = default;
// ident accessors
EOperatorId
Eopid() const override
{
return EopScalarSubqueryExists;
}
// return a string for scalar subquery
const CHAR *
SzId() const override
{
return "CScalarSubqueryExists";
}
// conversion function
static CScalarSubqueryExists *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopScalarSubqueryExists == pop->Eopid());
return dynamic_cast<CScalarSubqueryExists *>(pop);
}
}; // class CScalarSubqueryExists
} // namespace gpopt
#endif // !GPOPT_CScalarSubqueryExists_H
// EOF
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