greenplumn CXformImplementLimit 源码
greenplumn CXformImplementLimit 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformImplementLimit.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CXformImplementLimit.h
//
// @doc:
// Transform Logical into Physical Limit
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformImplementLimit_H
#define GPOPT_CXformImplementLimit_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformImplementation.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformImplementLimit
//
// @doc:
// Transform Logical into Physical Limit
//
//---------------------------------------------------------------------------
class CXformImplementLimit : public CXformImplementation
{
private:
public:
CXformImplementLimit(const CXformImplementLimit &) = delete;
// ctor
explicit CXformImplementLimit(CMemoryPool *mp);
// dtor
~CXformImplementLimit() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfImplementLimit;
}
const CHAR *
SzId() const override
{
return "CXformImplementLimit";
}
// compute xform promise for a given expression handle
EXformPromise Exfp(CExpressionHandle &exprhdl) const override;
// actual transform
void Transform(CXformContext *, CXformResult *,
CExpression *) const override;
}; // class CXformImplementLimit
} // namespace gpopt
#endif // !GPOPT_CXformImplementLimit_H
// EOF
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