greenplumn CContextQueryToDXL 源码
greenplumn CContextQueryToDXL 代码
文件路径：/src/include/gpopt/translate/CContextQueryToDXL.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 Greenplum, Inc.
//
// @filename:
// CContextQueryToDXL.h
//
// @doc:
// Class to hold information about a whole top-level query, while
// recursively translating a Query tree to DXL tree.
//
//---------------------------------------------------------------------------
#ifndef GPDXL_CContextQueryToDXL_H
#define GPDXL_CContextQueryToDXL_H
#include "gpos/base.h"
#include "gpopt/translate/CTranslatorUtils.h"
#include "naucrates/dxl/CIdGenerator.h"
#include "naucrates/dxl/operators/CDXLNode.h"
#define GPDXL_CTE_ID_START 1
#define GPDXL_COL_ID_START 1
namespace gpdxl
{
// fwd declarations
class CTranslatorQueryToDXL;
class CTranslatorScalarToDXL;
//---------------------------------------------------------------------------
// @class:
// CContextQueryToDXL
//
// @doc:
// Class to hold information about a whole top-level query, while
// recursively translating a Query tree to DXL tree.
//
//---------------------------------------------------------------------------
class CContextQueryToDXL
{
friend class CTranslatorQueryToDXL;
friend class CTranslatorScalarToDXL;
private:
// memory pool
CMemoryPool *m_mp;
// counter for generating unique column ids
CIdGenerator *m_colid_counter;
// counter for generating unique CTE ids
CIdGenerator *m_cte_id_counter;
// does the query have any distributed tables?
BOOL m_has_distributed_tables;
// What operator classes are used in the distribution keys?
DistributionHashOpsKind m_distribution_hashops;
public:
// ctor
CContextQueryToDXL(CMemoryPool *mp);
// dtor
~CContextQueryToDXL();
};
} // namespace gpdxl
#endif // GPDXL_CContextQueryToDXL_H
//EOF
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