greenplumn brin 源码
greenplumn brin 代码
文件路径：/src/include/access/brin.h
/*
* AM-callable functions for BRIN indexes
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/include/access/brin.h
*/
#ifndef BRIN_H
#define BRIN_H
#include "fmgr.h"
#include "nodes/execnodes.h"
#include "utils/relcache.h"
/*
* Storage type for BRIN's reloptions
*/
typedef struct BrinOptions
{
int32 vl_len_; /* varlena header (do not touch directly!) */
BlockNumber pagesPerRange;
bool autosummarize;
} BrinOptions;
/*
* BrinStatsData represents stats data for planner use
*/
typedef struct BrinStatsData
{
BlockNumber pagesPerRange;
BlockNumber revmapNumPages;
} BrinStatsData;
#define BRIN_DEFAULT_PAGES_PER_RANGE 128
#define BrinGetPagesPerRange(relation) \
((relation)->rd_options ? \
((BrinOptions *) (relation)->rd_options)->pagesPerRange : \
BRIN_DEFAULT_PAGES_PER_RANGE)
#define BrinGetAutoSummarize(relation) \
((relation)->rd_options ? \
((BrinOptions *) (relation)->rd_options)->autosummarize : \
false)
extern void brinGetStats(Relation index, BrinStatsData *stats);
#endif /* BRIN_H */
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