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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