greenplumn CMappingColIdVar 源码
greenplumn CMappingColIdVar 代码
文件路径：/src/include/gpopt/translate/CMappingColIdVar.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 Greenplum, Inc.
//
// @filename:
// CMappingColIdVar.h
//
// @doc:
// Abstract base class of ColId to VAR mapping when translating CDXLScalars
// If we need a CDXLScalar translator during DXL->PlStmt or DXL->Query translation
// we implement a colid->Var mapping for PlStmt or Query respectively that
// is derived from this interface.
//
// @test:
//
//
//---------------------------------------------------------------------------
#ifndef GPDXL_CMappingColIdVar_H
#define GPDXL_CMappingColIdVar_H
#include "gpos/base.h"
//fwd decl
struct Var;
struct Param;
struct PlannedStmt;
struct Query;
namespace gpdxl
{
using namespace gpos;
// fwd decl
class CDXLScalarIdent;
//---------------------------------------------------------------------------
// @class:
// CMappingColIdVar
//
// @doc:
// Class providing the interface for ColId in CDXLScalarIdent to Var
// mapping when translating CDXLScalar nodes
//
//---------------------------------------------------------------------------
class CMappingColIdVar
{
protected:
// memory pool
CMemoryPool *m_mp;
public:
// ctor/dtor
explicit CMappingColIdVar(CMemoryPool *);
virtual ~CMappingColIdVar() = default;
// translate DXL ScalarIdent node into GPDB Var node
virtual Var *VarFromDXLNodeScId(const CDXLScalarIdent *) = 0;
};
} // namespace gpdxl
#endif //GPDXL_CMappingColIdVar_H
// EOF
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