greenplumn CDXLLogicalExternalGet 源码
greenplumn CDXLLogicalExternalGet 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLLogicalExternalGet.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2013 VMware, Inc. or its affiliates.
//
// @filename:
// CDXLLogicalExternalGet.h
//
// @doc:
// Class for representing DXL logical external get operator, for reading
// from external tables
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLLogicalExternalGet_H
#define GPDXL_CDXLLogicalExternalGet_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLLogicalGet.h"
namespace gpdxl
{
//---------------------------------------------------------------------------
// @class:
// CDXLLogicalExternalGet
//
// @doc:
// Class for representing DXL logical external get operator
//
//---------------------------------------------------------------------------
class CDXLLogicalExternalGet : public CDXLLogicalGet
{
private:
public:
CDXLLogicalExternalGet(CDXLLogicalExternalGet &) = delete;
// ctor
CDXLLogicalExternalGet(CMemoryPool *mp, CDXLTableDescr *table_descr);
// operator type
Edxlopid GetDXLOperator() const override;
// operator name
const CWStringConst *GetOpNameStr() const override;
// conversion function
static CDXLLogicalExternalGet *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopLogicalExternalGet == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLLogicalExternalGet *>(dxl_op);
}
};
} // namespace gpdxl
#endif // !GPDXL_CDXLLogicalExternalGet_H
// EOF
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