greenplumn CDXLStatsDerivedColumn 源码

2022-08-18
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greenplumn CDXLStatsDerivedColumn 代码

文件路径：/src/backend/gporca/libnaucrates/include/naucrates/md/CDXLStatsDerivedColumn.h

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2012 EMC Corp.
//
//	@filename:
//		CDXLStatsDerivedColumn.h
//
//	@doc:
//		Class representing DXL derived column statistics
//---------------------------------------------------------------------------

#ifndef GPMD_CDXLStatsDerivedColumn_H
#define GPMD_CDXLStatsDerivedColumn_H

#include "gpos/base.h"
#include "gpos/common/CDouble.h"

#include "naucrates/md/CDXLBucket.h"

namespace gpdxl
{
class CXMLSerializer;
}

namespace gpmd
{
using namespace gpos;
using namespace gpdxl;
using namespace gpmd;

//---------------------------------------------------------------------------
//	@class:
//		CDXLStatsDerivedColumn
//
//	@doc:
//		Class representing DXL derived column statistics
//
//---------------------------------------------------------------------------
class CDXLStatsDerivedColumn : public CRefCount
{
private:
	// column identifier
	ULONG m_colid;

	// column width
	CDouble m_width;

	// null fraction
	CDouble m_null_freq;

	// ndistinct of remaining tuples
	CDouble m_distinct_remaining;

	// frequency of remaining tuples
	CDouble m_freq_remaining;

	CDXLBucketArray *m_dxl_stats_bucket_array;

public:
	CDXLStatsDerivedColumn(const CDXLStatsDerivedColumn &) = delete;

	// ctor
	CDXLStatsDerivedColumn(ULONG colid, CDouble width, CDouble null_freq,
						   CDouble distinct_remaining, CDouble freq_remaining,
						   CDXLBucketArray *dxl_stats_bucket_array);

	// dtor
	~CDXLStatsDerivedColumn() override;

	// column identifier
	ULONG
	GetColId() const
	{
		return m_colid;
	}

	// column width
	CDouble
	Width() const
	{
		return m_width;
	}

	// null fraction of this column
	CDouble
	GetNullFreq() const
	{
		return m_null_freq;
	}

	// ndistinct of remaining tuples
	CDouble
	GetDistinctRemain() const
	{
		return m_distinct_remaining;
	}

	// frequency of remaining tuples
	CDouble
	GetFreqRemain() const
	{
		return m_freq_remaining;
	}

	const CDXLBucketArray *TransformHistogramToDXLBucketArray() const;

	// serialize bucket in DXL format
	void Serialize(gpdxl::CXMLSerializer *) const;

#ifdef GPOS_DEBUG
	// debug print of the bucket
	void DebugPrint(IOstream &os) const;
#endif
};

// array of dxl buckets
using CDXLStatsDerivedColumnArray =
	CDynamicPtrArray<CDXLStatsDerivedColumn, CleanupRelease>;
}  // namespace gpmd

#endif	// !GPMD_CDXLStatsDerivedColumn_H

// EOF

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