greenplumn CJoinCardinalityTest 代码
文件路径：/src/backend/gporca/server/include/unittest/dxl/statistics/CJoinCardinalityTest.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2017 VMware, Inc. or its affiliates.
/
/ @filename:
/ CJoinCardinalityTest.h
/
/ @doc:
/ Test for join cardinality estimation
/---------------------------------------------------------------------------
#ifndef GPNAUCRATES_CJoinCardinalityTest_H
#define GPNAUCRATES_CJoinCardinalityTest_H
#include "naucrates/statistics/CBucket.h"
#include "naucrates/statistics/CHistogram.h"
#include "naucrates/statistics/CPoint.h"
#include "naucrates/statistics/CStatistics.h"
#include "naucrates/statistics/CStatsPredDisj.h"
namespace gpnaucrates
{
/---------------------------------------------------------------------------
/ @class:
/ CJoinCardinalityTest
/
/ @doc:
/ Static unit tests for join cardinality estimation
/
/---------------------------------------------------------------------------
class CJoinCardinalityTest
{
/ shorthand for functions for generating the join predicates
typedef CStatsPredJoinArray *(FnPdrgpstatjoin)(CMemoryPool *mp);
private:
/ test case for join evaluation
struct SStatsJoinSTestCase
{
/ input stats dxl file
const CHAR *m_szInputFile;
/ output stats dxl file
const CHAR *m_szOutputFile;
/ is the join a left outer join
BOOL m_fLeftOuterJoin;
/ join predicate generation function pointer
FnPdrgpstatjoin *m_pf;
}; / SStatsJoinSTestCase
/ test case for join evaluation with NDVRemain
struct SStatsJoinNDVRemainTestCase
{
/ column identifier for the first histogram
ULONG m_ulCol1;
/ column identifier for the second histogram
ULONG m_ulCol2;
/ number of buckets in the output
ULONG m_ulBucketsJoin;
/ cumulative number of distinct values in the buckets of the join histogram
CDouble m_dNDVBucketsJoin;
/ NDV remain of the join histogram
CDouble m_dNDVRemainJoin;
/ frequency of the NDV remain in the join histogram
CDouble m_dFreqRemainJoin;
}; / SStatsJoinNDVRemainTestCase
/ int4 histogram test cases
struct SHistogramTestCase
{
/ number of buckets in the histogram
ULONG m_num_of_buckets;
/ number of distinct values per bucket
CDouble m_dNDVPerBucket;
/ percentage of tuples that are null
BOOL m_fNullFreq;
/ number of remain distinct values
CDouble m_dNDVRemain;
}; / SHistogramTestCase
/ helper method to generate a single join predicate
static CStatsPredJoinArray *PdrgpstatspredjoinSingleJoinPredicate(
CMemoryPool *mp);
/ helper method to generate generate multiple join predicates
static CStatsPredJoinArray *PdrgpstatspredjoinMultiplePredicates(
CMemoryPool *mp);
/ helper method to generate join predicate over columns that contain null values
static CStatsPredJoinArray *PdrgpstatspredjoinNullableCols(CMemoryPool *mp);
public:
/ unittests
static GPOS_RESULT EresUnittest();
/ test join cardinality estimation over histograms with NDVRemain information
static GPOS_RESULT EresUnittest_JoinNDVRemain();
/ join buckets tests
static GPOS_RESULT EresUnittest_Join();
}; / class CJoinCardinalityTest
} / namespace gpnaucrates
#endif / !GPNAUCRATES_CJoinCardinalityTest_H
/ EOF
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