greenplumn CKeyCollection 源码

2022-08-18
浏览 (493)

greenplumn CKeyCollection 代码

文件路径：/src/backend/gporca/libgpopt/include/gpopt/base/CKeyCollection.h

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2009 - 2012 EMC CORP.
//
//	@filename:
//		CKeyCollection.h
//
//	@doc:
//		Encodes key sets for a relation
//---------------------------------------------------------------------------
#ifndef GPOPT_CKeyCollection_H
#define GPOPT_CKeyCollection_H

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

#include "gpopt/base/CColRefSet.h"


namespace gpopt
{
using namespace gpos;

//---------------------------------------------------------------------------
//	@class:
//		CKeyCollection
//
//	@doc:
//		Captures sets of keys for a relation
//
//---------------------------------------------------------------------------
class CKeyCollection : public CRefCount, public DbgPrintMixin<CKeyCollection>
{
private:
	// array of key sets
	CColRefSetArray *m_pdrgpcrs;

public:
	CKeyCollection(const CKeyCollection &) = delete;

	// ctors
	explicit CKeyCollection(CMemoryPool *mp);
	CKeyCollection(CMemoryPool *mp, CColRefSet *pcrs);
	CKeyCollection(CMemoryPool *mp, CColRefArray *colref_array);

	// dtor
	~CKeyCollection() override;

	// add individual set -- takes ownership
	void Add(CColRefSet *pcrs);

	// check if set forms a key
	BOOL FKey(const CColRefSet *pcrs, BOOL fExactMatch = true) const;

	// check if an array of columns constitutes a key
	BOOL FKey(CMemoryPool *mp, const CColRefArray *colref_array) const;

	// trim off non-key columns
	CColRefArray *PdrgpcrTrim(CMemoryPool *mp,
							  const CColRefArray *colref_array) const;

	// extract a key
	CColRefArray *PdrgpcrKey(CMemoryPool *mp) const;

	// extract a hashable key
	CColRefArray *PdrgpcrHashableKey(CMemoryPool *mp) const;

	// extract key at given position
	CColRefArray *PdrgpcrKey(CMemoryPool *mp, ULONG ul) const;

	// extract key at given position
	CColRefSet *PcrsKey(CMemoryPool *mp, ULONG ul) const;

	// number of keys
	ULONG
	Keys() const
	{
		return m_pdrgpcrs->Size();
	}

	// print
	IOstream &OsPrint(IOstream &os) const;

};	// class CKeyCollection

// shorthand for printing
inline IOstream &
operator<<(IOstream &os, CKeyCollection &kc)
{
	return kc.OsPrint(os);
}

}  // namespace gpopt

#endif	// !GPOPT_CKeyCollection_H

// EOF

相关信息

greenplumn 源码目录

相关文章

greenplumn CAutoOptCtxt 源码

greenplumn CCTEInfo 源码

greenplumn CCTEMap 源码

greenplumn CCTEReq 源码

greenplumn CCastUtils 源码

greenplumn CColConstraintsArrayMapper 源码

greenplumn CColConstraintsHashMapper 源码

greenplumn CColRef 源码

greenplumn CColRefComputed 源码

greenplumn CColRefSet 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/37154d8c0b9d4f69951b5845c41f5f87

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...