greenplumn CCardinalityTestUtils 代码
文件路径：/src/backend/gporca/server/include/unittest/dxl/statistics/CCardinalityTestUtils.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2017 VMware, Inc. or its affiliates.
/
/ @filename:
/ CCardinalityTestUtils.h
/
/ @doc:
/ Utility functions used in the testing cardinality estimation
/---------------------------------------------------------------------------
#ifndef GPNAUCRATES_CCardinalityTestUtils_H
#define GPNAUCRATES_CCardinalityTestUtils_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:
/ CCardinalityTestUtils
/
/ @doc:
/ Static utility functions used in the testing cardinality estimation
/
/---------------------------------------------------------------------------
class CCardinalityTestUtils
{
public:
/ create a bucket with integer bounds, and lower bound is closed
static CBucket *PbucketIntegerClosedLowerBound(CMemoryPool *mp, INT iLower,
INT iUpper, CDouble,
CDouble);
/ create a singleton bucket containing a boolean value
static CBucket *PbucketSingletonBoolVal(CMemoryPool *mp, BOOL fValue,
CDouble frequency);
/ create an integer bucket with the provider upper/lower bound, frequency and NDV information
static CBucket *PbucketInteger(CMemoryPool *mp, INT iLower, INT iUpper,
BOOL is_lower_closed, BOOL is_upper_closed,
CDouble frequency, CDouble distinct);
/ helper function to generate integer histogram based on the NDV and bucket information provided
static CHistogram *PhistInt4Remain(CMemoryPool *mp, ULONG num_of_buckets,
CDouble dNDVPerBucket, BOOL fNullFreq,
CDouble num_NDV_remain);
/ helper function to generate an example integer histogram
static CHistogram *PhistExampleInt4(CMemoryPool *mp);
/ helper function to generate an example boolean histogram
static CHistogram *PhistExampleBool(CMemoryPool *mp);
/ helper function to generate a point from an encoded value of specific datatype
static CPoint *PpointGeneric(CMemoryPool *mp, OID oid,
CWStringDynamic *pstrValueEncoded, LINT value);
/ helper function to generate a point of numeric datatype
static CPoint *PpointNumeric(CMemoryPool *mp,
CWStringDynamic *pstrEncodedValue,
CDouble value);
/ helper function to generate a point of double datatype
static CPoint *PpointDouble(CMemoryPool *mp, OID oid, CDouble value);
/ helper method to print statistics object
static void PrintStats(CMemoryPool *mp, const IStatistics *stats);
/ helper method to print histogram object
static void PrintHist(CMemoryPool *mp, const char *pcPrefix,
const CHistogram *histogram);
/ helper method to print bucket object
static void PrintBucket(CMemoryPool *mp, const char *pcPrefix,
const CBucket *bucket);
}; / class CCardinalityTestUtils
} / namespace gpnaucrates
#endif / !GPNAUCRATES_CCardinalityTestUtils_H
/ EOF
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