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
相关信息
相关文章
greenplumn CContextDXLToPlStmt 源码
greenplumn CContextQueryToDXL 源码
greenplumn CDXLTranslateContext 源码
greenplumn CDXLTranslateContextBaseTable 源码