greenplumn CGPDBAttInfo 源码

2022-08-18
浏览 (831)

greenplumn CGPDBAttInfo 代码

文件路径：/src/include/gpopt/translate/CGPDBAttInfo.h

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2012 EMC Corp.
//
//	@filename:
//		CGPDBAttInfo.h
//
//	@doc:
//		Class to uniquely identify a column in GPDB
//
//	@test:
//
//
//---------------------------------------------------------------------------

#ifndef GPDXL_CGPDBAttInfo_H
#define GPDXL_CGPDBAttInfo_H

#include "gpos/base.h"
#include "gpos/common/CRefCount.h"
#include "gpos/utils.h"

#include "naucrates/dxl/gpdb_types.h"

namespace gpdxl
{
using namespace gpos;

//---------------------------------------------------------------------------
//	@class:
//		CGPDBAttInfo
//
//	@doc:
//		Class to uniquely identify a column in GPDB
//
//---------------------------------------------------------------------------
class CGPDBAttInfo : public CRefCount
{
private:
	// query level number
	ULONG m_query_level;

	// varno in the rtable
	ULONG m_varno;

	// attno
	INT m_attno;

public:
	CGPDBAttInfo(const CGPDBAttInfo &) = delete;

	// ctor
	CGPDBAttInfo(ULONG query_level, ULONG var_no, INT attrnum)
		: m_query_level(query_level), m_varno(var_no), m_attno(attrnum)
	{
	}

	// d'tor
	~CGPDBAttInfo() override = default;

	// accessor
	ULONG
	GetQueryLevel() const
	{
		return m_query_level;
	}

	// accessor
	ULONG
	GetVarNo() const
	{
		return m_varno;
	}

	// accessor
	INT
	GetAttNo() const
	{
		return m_attno;
	}

	// equality check
	BOOL
	Equals(const CGPDBAttInfo &gpdb_att_info) const
	{
		return m_query_level == gpdb_att_info.m_query_level &&
			   m_varno == gpdb_att_info.m_varno &&
			   m_attno == gpdb_att_info.m_attno;
	}

	// hash value
	ULONG
	HashValue() const
	{
		return gpos::CombineHashes(
			gpos::HashValue(&m_query_level),
			gpos::CombineHashes(gpos::HashValue(&m_varno),
								gpos::HashValue(&m_attno)));
	}
};

// hash function
inline ULONG
HashGPDBAttInfo(const CGPDBAttInfo *gpdb_att_info)
{
	GPOS_ASSERT(nullptr != gpdb_att_info);
	return gpdb_att_info->HashValue();
}

// equality function
inline BOOL
EqualGPDBAttInfo(const CGPDBAttInfo *gpdb_att_info_a,
				 const CGPDBAttInfo *gpdb_att_info_b)
{
	GPOS_ASSERT(nullptr != gpdb_att_info_a && nullptr != gpdb_att_info_b);
	return gpdb_att_info_a->Equals(*gpdb_att_info_b);
}

}  // namespace gpdxl

#endif	// !GPDXL_CGPDBAttInfo_H

// EOF

相关信息

greenplumn 源码目录

相关文章

greenplumn CCTEListEntry 源码

greenplumn CContextDXLToPlStmt 源码

greenplumn CContextQueryToDXL 源码

greenplumn CDXLTranslateContext 源码

greenplumn CDXLTranslateContextBaseTable 源码

greenplumn CGPDBAttOptCol 源码

greenplumn CIndexQualInfo 源码

greenplumn CMappingColIdVar 源码

greenplumn CMappingColIdVarPlStmt 源码

greenplumn CMappingElementColIdParamId 源码

0 赞

所属分类： 大数据
本文标签： greenplum
版权声明： 原创文章如转载，请注明本文链接: https://www.seaxiang.com/blog/cb854c27792b4eeebfdcc47354376525

热门推荐

1、直接访问google.com
2、 - 优质文章
3、 gate.io
4、 harmony 鸿蒙hdc使用指导
5、 harmony 鸿蒙初识ArkTS语言
6、 harmony 鸿蒙ArkUI组件（ArkTS）开发常见问题
7、 flink kafka connector scan.startup.mode 的几个选项
8、 golang
9、 openharmony
10、 Vue中input框自动聚焦

Loading...