greenplumn CXformExternalGet2ExternalScan 源码
greenplumn CXformExternalGet2ExternalScan 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformExternalGet2ExternalScan.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2013 VMware, Inc. or its affiliates.
//
// @filename:
// CXformExternalGet2ExternalScan.h
//
// @doc:
// Transform ExternalGet to ExternalScan
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformExternalGet2ExternalScan_H
#define GPOPT_CXformExternalGet2ExternalScan_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformImplementation.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformExternalGet2ExternalScan
//
// @doc:
// Transform ExternalGet to ExternalScan
//
//---------------------------------------------------------------------------
class CXformExternalGet2ExternalScan : public CXformImplementation
{
private:
public:
CXformExternalGet2ExternalScan(const CXformExternalGet2ExternalScan &) =
delete;
// ctor
explicit CXformExternalGet2ExternalScan(CMemoryPool *);
// dtor
~CXformExternalGet2ExternalScan() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfExternalGet2ExternalScan;
}
// return a string for xform name
const CHAR *
SzId() const override
{
return "CXformExternalGet2ExternalScan";
}
// compute xform promise for a given expression handle
EXformPromise Exfp(CExpressionHandle &exprhdl) const override;
// actual transform
void Transform(CXformContext *pxfctxt, CXformResult *pxfres,
CExpression *pexpr) const override;
}; // class CXformExternalGet2ExternalScan
} // namespace gpopt
#endif // !GPOPT_CXformExternalGet2ExternalScan_H
// EOF
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